XmlPullParserImpl (Javolution v3.7 API)

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javolution.xml.pull
Class XmlPullParserImpl

java.lang.Object
  javolution.xml.pull.XmlPullParserImpl

All Implemented Interfaces:: Reusable, XmlPullParser

public final class XmlPullParserImpl
extends java.lang.Object
implements XmlPullParser, Reusable
extends java.lang.Object
implements XmlPullParser, Reusable

This class provides a real-time XPP-like XML parser; this parser is extremely fast (around 2-5x times faster than conventional SAX/XPP parsers).

This parser does not create temporary objects (e.g. no String instance allocated on the heap) and has no adverse effect on memory footprint and garbage collection.

The parser input source can be either a Reader, an InputStream or even a ByteBuffer (e.g. MappedByteBuffer). Here is an example parsing a resource as input stream:

     InputStream in = Configuration.class.getResourceAsStream("configuration.xml");
     XmlPullParserImpl xpp = new XmlPullParserImpl();
     xpp.setInput(in);
     for (int e = xpp.getEventType(); e != XmlPullParserImpl.END_DOCUMENT; e = xpp.next()) {
         if (e == XmlPullParserImpl.START_TAG) { // Reads <key>value</key>
             CharSequence key = xpp.getName();
             if (xpp.next() == XmlPullParserImpl.TEXT) {
                 CharSequence value = xpp.getText();
                 Configuration.set(key, value);
             }
         }
     }

This parser is light (less than 15Kbytes compressed) and maintains a very small memory footprint while parsing (e.g. less than 10Kbytes while parsing 32Mbytes files). Typical applications include SOAP messaging, embedded/realtime systems (J2ME), web servers (possibly thousands instances running concurrently), etc.

The CharSequence generated by this parser have the following characteristics:

They are immutable within their definition scope. The CharSequence created while parsing an XML element are reused only after the element is out-of-scope (end tag).
They support equality or lexical comparison with any CharSequence (e.g. String).
They have the same hashcode than String and can be used to retrieve data from maps (e.g. FastMap) for which the keys are String instances.
Like any CharSequence, they can quickly be converted to primitive types (e.g. int, double) using the TypeFormat utility class.

Finally, this parser does not break up character data during call back (the whole character data between markups is always being returned).

Note: If a SAX2 parser is required, applications may also use the SAX2 wrapper (3-5x faster than conventional SAX2 parsers).

Version:: 3.4, September 20, 2005
Author:: Gregory Arakelian, Jean-Marie Dautelle

Field Summary
`static java.lang.String`	`FEATURE_IGNORE_WHITESPACE` If this feature is activated, whitespaces are ignored.

Fields inherited from interface javolution.xml.pull.XmlPullParser
`CDSECT, COMMENT, DOCDECL, END_DOCUMENT, END_TAG, ENTITY_REF, FEATURE_PROCESS_DOCDECL, FEATURE_PROCESS_NAMESPACES, FEATURE_REPORT_NAMESPACE_ATTRIBUTES, FEATURE_VALIDATION, IGNORABLE_WHITESPACE, NO_NAMESPACE, PROCESSING_INSTRUCTION, START_DOCUMENT, START_TAG, TEXT, TYPES`

Constructor Summary
`XmlPullParserImpl()` Default constructor.

Method Summary
`void`	`defineEntityReplacementText(java.lang.String entityName, java.lang.String replacementText)` Set new value for entity replacement text as defined in XML 1.0 Section 4.5 Construction of Internal Entity Replacement Text.
`int`	`getAttributeCount()` Returns the number of attributes of the current start tag, or -1 if the current event type is not START_TAG
`java.lang.CharSequence`	`getAttributeName(int index)` Returns the local name of the specified attribute if namespaces are enabled or just attribute name if namespaces are disabled.
`java.lang.CharSequence`	`getAttributeNamespace(int index)` Returns the namespace URI of the attribute with the given index (starts from 0).
`java.lang.CharSequence`	`getAttributePrefix(int index)` Returns the prefix of the specified attribute Returns null if the element has no prefix.
`java.lang.String`	`getAttributeType(int index)` Returns the type of the specified attribute If parser is non-validating it MUST return CDATA.
`java.lang.CharSequence`	`getAttributeValue(int index)` Returns the given attributes value.
`java.lang.CharSequence`	`getAttributeValue(java.lang.String namespace, java.lang.String name)` Returns the attributes value identified by namespace URI and namespace localName.
`int`	`getColumnNumber()` Returns the current column number, starting from 0.
`int`	`getDepth()` Returns the current depth of the element.
`int`	`getEventType()` Returns the type of the current event (START_TAG, END_TAG, TEXT, etc.)
`boolean`	`getFeature(java.lang.String name)` Returns the current value of the given feature.
`java.lang.String`	`getInputEncoding()` Returns the input encoding if known, null otherwise.
`int`	`getLineNumber()` Returns the current line number, starting from 1.
`java.lang.CharSequence`	`getName()` For START_TAG or END_TAG events, the (local) name of the current element is returned when namespaces are enabled.
`java.lang.CharSequence`	`getNamespace()` Returns the namespace URI of the current element.
`java.lang.CharSequence`	`getNamespace(java.lang.String prefix)` Returns the URI corresponding to the given prefix, depending on current state of the parser.
`int`	`getNamespaceCount(int depth)` Returns the numbers of elements in the namespace stack for the given depth.
`java.lang.CharSequence`	`getNamespacePrefix(int pos)` Returns the namespace prefixe for the given position in the namespace stack.
`java.lang.CharSequence`	`getNamespaceUri(int pos)` Returns the namespace URI for the given position in the namespace stack If the position is out of range, an exception is thrown.
`java.lang.CharSequence`	`getPositionDescription()` Returns a short text describing the current parser state, including the position, a description of the current event and the data source if known.
`java.lang.CharSequence`	`getPrefix()` Returns the prefix of the current element.
`java.lang.Object`	`getProperty(java.lang.String name)` Look up the value of a property.
`java.lang.CharSequence`	`getQName()` Returns the current element qualified name.
`Attributes`	`getSaxAttributes()` Returns SAX-2 like attributes for the current element.
`java.lang.CharSequence`	`getText()` Returns the text content of the current event as CharSequence.
`char[]`	`getTextCharacters(int[] holderForStartAndLength)` Returns the buffer that contains the text of the current event, as well as the start offset and length relevant for the current event.
`boolean`	`isAttributeDefault(int index)` Returns if the specified attribute was not in input was declared in XML.
`boolean`	`isEmptyElementTag()` Returns true if the current event is START_TAG and the tag is degenerated (e.g.
`boolean`	`isWhitespace()` Checks whether the current TEXT event contains only whitespace characters.
`int`	`next()` Get next parsing event - element content will be coalesced and only one TEXT event must be returned for whole element content (comments and processing instructions will be ignored and entity references must be expanded or exception mus be thrown if entity reference can not be expanded).
`int`	`nextTag()` Call next() and return event if it is START_TAG or END_TAG otherwise throw an exception.
`java.lang.CharSequence`	`nextText()` If current event is START_TAG then if next element is TEXT then element content is returned or if next event is END_TAG then empty string is returned, otherwise exception is thrown.
`int`	`nextToken()` This method works similarly to next() but will expose additional event types (COMMENT, CDSECT, DOCDECL, ENTITY_REF, PROCESSING_INSTRUCTION, or IGNORABLE_WHITESPACE) if they are available in input.
`void`	`require(int type, java.lang.String namespace, java.lang.String name)` Test if the current event is of the given type and if the namespace and name do match.
`void`	`reset()` Resets the internal state of this object to its default values.
`void`	`setFeature(java.lang.String name, boolean state)` Use this call to change the general behaviour of the parser, such as namespace processing or doctype declaration handling.
`void`	`setInput(java.nio.ByteBuffer byteBuffer)` Sets the byte buffer this parser is going to process (UTF-8 encoding).
`void`	`setInput(java.io.InputStream in)` Sets the input stream this parser is going to process (UTF-8 encoding).
`void`	`setInput(java.io.InputStream inputStream, java.lang.String inputEncoding)` Sets the input stream the parser is going to process.
`void`	`setInput(java.io.Reader in)` Set the input source for parser to the given reader and resets the parser.
`void`	`setProperty(java.lang.String name, java.lang.Object value)` Set the value of a property.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

FEATURE_IGNORE_WHITESPACE

public static final java.lang.String FEATURE_IGNORE_WHITESPACE

If this feature is activated, whitespaces are ignored. In other words, there will be no XmlPullParser.TEXT event with isWhitespace() returning true.

See Also:: Constant Field Values

Constructor Detail

XmlPullParserImpl

public XmlPullParserImpl()

Default constructor.

Method Detail

setInput

public void setInput(java.nio.ByteBuffer byteBuffer)

Sets the byte buffer this parser is going to process (UTF-8 encoding).

Parameters:: byteBuffer - the byte buffer with UTF-8 encoding.
See Also:: Utf8ByteBufferReader

setInput

public void setInput(java.io.InputStream in)

Sets the input stream this parser is going to process (UTF-8 encoding).

Parameters:: in - the input stream with UTF-8 encoding.
See Also:: Utf8StreamReader

setInput

public void setInput(java.io.InputStream inputStream,
                     java.lang.String inputEncoding)
              throws XmlPullParserException

Description copied from interface: XmlPullParser

Sets the input stream the parser is going to process. This call resets the parser state and sets the event type to the initial value START_DOCUMENT.

NOTE: If an input encoding string is passed, it MUST be used. Otherwise, if inputEncoding is null, the parser SHOULD try to determine input encoding following XML 1.0 specification (see below). If encoding detection is supported then following feature http://xmlpull.org/v1/doc/features.html#detect-encoding MUST be true amd otherwise it must be false

Specified by:: setInput in interface XmlPullParser

Parameters:: inputStream - contains a raw byte input stream of possibly unknown encoding (when inputEncoding is null).; inputEncoding - if not null it MUST be used as encoding for inputStream
Throws:: XmlPullParserException

setInput

public void setInput(java.io.Reader in)

Description copied from interface: XmlPullParser

Set the input source for parser to the given reader and resets the parser. The event type is set to the initial value START_DOCUMENT. Setting the reader to null will just stop parsing and reset parser state, allowing the parser to free internal resources such as parsing buffers.

Specified by:: setInput in interface XmlPullParser

defineEntityReplacementText

public void defineEntityReplacementText(java.lang.String entityName,
                                        java.lang.String replacementText)
                                 throws XmlPullParserException

Description copied from interface: XmlPullParser

Set new value for entity replacement text as defined in XML 1.0 Section 4.5 Construction of Internal Entity Replacement Text. If FEATURE_PROCESS_DOCDECL or FEATURE_VALIDATION are set, calling this function will result in an exception -- when processing of DOCDECL is enabled, there is no need to the entity replacement text manually.

The motivation for this function is to allow very small implementations of XMLPULL that will work in J2ME environments. Though these implementations may not be able to process the document type declaration, they still can work with known DTDs by using this function.

Please notes: The given value is used literally as replacement text and it corresponds to declaring entity in DTD that has all special characters escaped: left angle bracket is replaced with <, ampersnad with & and so on.

Note: The given value is the literal replacement text and must not contain any other entity reference (if it contains any entity reference there will be no further replacement).

Note: The list of pre-defined entity names will always contain standard XML entities such as amp (&), lt (<), gt (>), quot ("), and apos ('). Those cannot be redefined by this method!

Specified by:: defineEntityReplacementText in interface XmlPullParser

Throws:: XmlPullParserException
See Also:: XmlPullParser.setInput(java.io.Reader), XmlPullParser.FEATURE_PROCESS_DOCDECL, XmlPullParser.FEATURE_VALIDATION

getSaxAttributes

public Attributes getSaxAttributes()

Returns SAX-2 like attributes for the current element.

Returns:: the attributes of the current element.

getAttributeCount

public int getAttributeCount()

Description copied from interface: XmlPullParser

Returns the number of attributes of the current start tag, or -1 if the current event type is not START_TAG

Specified by:: getAttributeCount in interface XmlPullParser

See Also:: XmlPullParser.getAttributeNamespace(int), XmlPullParser.getAttributeName(int), XmlPullParser.getAttributePrefix(int), XmlPullParser.getAttributeValue(int)

getAttributeName

public java.lang.CharSequence getAttributeName(int index)

Description copied from interface: XmlPullParser

Returns the local name of the specified attribute if namespaces are enabled or just attribute name if namespaces are disabled. Throws an IndexOutOfBoundsException if the index is out of range or current event type is not START_TAG.

Specified by:: getAttributeName in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: attribute name (null is never returned)

getAttributeNamespace

public java.lang.CharSequence getAttributeNamespace(int index)

Description copied from interface: XmlPullParser

Returns the namespace URI of the attribute with the given index (starts from 0). Returns an empty string ("") if namespaces are not enabled or the attribute has no namespace. Throws an IndexOutOfBoundsException if the index is out of range or the current event type is not START_TAG.

NOTE: if FEATURE_REPORT_NAMESPACE_ATTRIBUTES is set then namespace attributes (xmlns:ns='...') must be reported with namespace http://www.w3.org/2000/xmlns/ (visit this URL for description!). The default namespace attribute (xmlns="...") will be reported with empty namespace.

NOTE:The xml prefix is bound as defined in Namespaces in XML specification to "http://www.w3.org/XML/1998/namespace".

Specified by:: getAttributeNamespace in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: attribute namespace, empty string ("") is returned if namesapces processing is not enabled or namespaces processing is enabled but attribute has no namespace (it has no prefix).

getAttributePrefix

public java.lang.CharSequence getAttributePrefix(int index)

Description copied from interface: XmlPullParser

Returns the prefix of the specified attribute Returns null if the element has no prefix. If namespaces are disabled it will always return null. Throws an IndexOutOfBoundsException if the index is out of range or current event type is not START_TAG.

Specified by:: getAttributePrefix in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: attribute prefix or null if namespaces processing is not enabled.

getAttributeType

public java.lang.String getAttributeType(int index)

Description copied from interface: XmlPullParser

Returns the type of the specified attribute If parser is non-validating it MUST return CDATA.

Specified by:: getAttributeType in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: attribute type (null is never returned)

getAttributeValue

public java.lang.CharSequence getAttributeValue(java.lang.String namespace,
                                                java.lang.String name)

Description copied from interface: XmlPullParser

Returns the attributes value identified by namespace URI and namespace localName. If namespaces are disabled namespace must be null. If current event type is not START_TAG then IndexOutOfBoundsException will be thrown.

NOTE: attribute value must be normalized (including entity replacement text if PROCESS_DOCDECL is false) as described in XML 1.0 section 3.3.3 Attribute-Value Normalization

Specified by:: getAttributeValue in interface XmlPullParser

Parameters:: namespace - Namespace of the attribute if namespaces are enabled otherwise must be null; name - If namespaces enabled local name of attribute otherwise just attribute name
Returns:: value of attribute or null if attribute with given name does not exist
See Also:: XmlPullParser.defineEntityReplacementText(java.lang.String, java.lang.String)

getAttributeValue

public java.lang.CharSequence getAttributeValue(int index)

Description copied from interface: XmlPullParser

Returns the given attributes value. Throws an IndexOutOfBoundsException if the index is out of range or current event type is not START_TAG.

NOTE: attribute value must be normalized (including entity replacement text if PROCESS_DOCDECL is false) as described in XML 1.0 section 3.3.3 Attribute-Value Normalization

Specified by:: getAttributeValue in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: value of attribute (null is never returned)
See Also:: XmlPullParser.defineEntityReplacementText(java.lang.String, java.lang.String)

getDepth

public int getDepth()

Description copied from interface: XmlPullParser

Returns the current depth of the element. Outside the root element, the depth is 0. The depth is incremented by 1 when a start tag is reached. The depth is decremented AFTER the end tag event was observed.

 <!-- outside -->     0
 <root>               1
   sometext           1
     <foobar>         2
     </foobar>        2
 </root>              1
 <!-- outside -->     0

Specified by:: getDepth in interface XmlPullParser

getEventType

public int getEventType()
                 throws XmlPullParserException

Description copied from interface: XmlPullParser

Returns the type of the current event (START_TAG, END_TAG, TEXT, etc.)

Specified by:: getEventType in interface XmlPullParser

Throws:: XmlPullParserException
See Also:: XmlPullParser.next(), XmlPullParser.nextToken()

getInputEncoding

public java.lang.String getInputEncoding()

Description copied from interface: XmlPullParser

Returns the input encoding if known, null otherwise. If setInput(InputStream, inputEncoding) was called with an inputEncoding value other than null, this value must be returned from this method. Otherwise, if inputEncoding is null and the parser suppports the encoding detection feature (http://xmlpull.org/v1/doc/features.html#detect-encoding), it must return the detected encoding. If setInput(Reader) was called, null is returned. After first call to next if XML declaration was present this method will return encoding declared.

Specified by:: getInputEncoding in interface XmlPullParser

getLineNumber

public int getLineNumber()

Description copied from interface: XmlPullParser

Returns the current line number, starting from 1. When the parser does not know the current line number or can not determine it, -1 is returned (e.g. for WBXML).

Specified by:: getLineNumber in interface XmlPullParser

Returns:: current line number or -1 if unknown.

getColumnNumber

public int getColumnNumber()

Description copied from interface: XmlPullParser

Returns the current column number, starting from 0. When the parser does not know the current column number or can not determine it, -1 is returned (e.g. for WBXML).

Specified by:: getColumnNumber in interface XmlPullParser

Returns:: current column number or -1 if unknown.

getName

public java.lang.CharSequence getName()

Description copied from interface: XmlPullParser

For START_TAG or END_TAG events, the (local) name of the current element is returned when namespaces are enabled. When namespace processing is disabled, the raw name is returned. For ENTITY_REF events, the entity name is returned. If the current event is not START_TAG, END_TAG, or ENTITY_REF, null is returned.

Please note: To reconstruct the raw element name when namespaces are enabled and the prefix is not null, you will need to add the prefix and a colon to localName..

Specified by:: getName in interface XmlPullParser

getNamespace

public java.lang.CharSequence getNamespace()

Description copied from interface: XmlPullParser

Returns the namespace URI of the current element. The default namespace is represented as empty string. If namespaces are not enabled, an empty String ("") is always returned. The current event must be START_TAG or END_TAG; otherwise, null is returned.

Specified by:: getNamespace in interface XmlPullParser

getPrefix

public java.lang.CharSequence getPrefix()

Description copied from interface: XmlPullParser

Returns the prefix of the current element. If the element is in the default namespace (has no prefix), null is returned. If namespaces are not enabled, or the current event is not START_TAG or END_TAG, null is returned.

Specified by:: getPrefix in interface XmlPullParser

getQName

public java.lang.CharSequence getQName()

Returns the current element qualified name.

Returns:: the qualified name of the current element (prefix:localName).

getNamespace

public java.lang.CharSequence getNamespace(java.lang.String prefix)

Description copied from interface: XmlPullParser

Returns the URI corresponding to the given prefix, depending on current state of the parser.

If the prefix was not declared in the current scope, null is returned. The default namespace is included in the namespace table and is available via getNamespace (null).

This method is a convenience method for

  for (int i = getNamespaceCount(getDepth ())-1; i >= 0; i--) {
   if (getNamespacePrefix(i).equals( prefix )) {
     return getNamespaceUri(i);
   }
  }
  return null;

Please note: parser implementations may provide more efifcient lookup, e.g. using a Hashtable. The 'xml' prefix is bound to "http://www.w3.org/XML/1998/namespace", as defined in the Namespaces in XML specification. Analogous, the 'xmlns' prefix is resolved to http://www.w3.org/2000/xmlns/

Specified by:: getNamespace in interface XmlPullParser

See Also:: XmlPullParser.getNamespaceCount(int), XmlPullParser.getNamespacePrefix(int), XmlPullParser.getNamespaceUri(int)

getNamespaceCount

public int getNamespaceCount(int depth)

Description copied from interface: XmlPullParser

Returns the numbers of elements in the namespace stack for the given depth. If namespaces are not enabled, 0 is returned.

NOTE: when parser is on END_TAG then it is allowed to call this function with getDepth()+1 argument to retrieve position of namespace prefixes and URIs that were declared on corresponding START_TAG.

NOTE: to retrieve lsit of namespaces declared in current element:

       XmlPullParser pp = ...
       int nsStart = pp.getNamespaceCount(pp.getDepth()-1);
       int nsEnd = pp.getNamespaceCount(pp.getDepth());
       for (int i = nsStart; i < nsEnd; i++) {
          String prefix = pp.getNamespacePrefix(i);
          String ns = pp.getNamespaceUri(i);
           // ...
      }

Specified by:: getNamespaceCount in interface XmlPullParser

See Also:: XmlPullParser.getNamespacePrefix(int), XmlPullParser.getNamespaceUri(int), XmlPullParser.getNamespace(), XmlPullParser.getNamespace(String)

getNamespacePrefix

public java.lang.CharSequence getNamespacePrefix(int pos)

Description copied from interface: XmlPullParser

Returns the namespace prefixe for the given position in the namespace stack. Default namespace declaration (xmlns='...') will have null as prefix. If the given index is out of range, an exception is thrown.

Please note: when the parser is on an END_TAG, namespace prefixes that were declared in the corresponding START_TAG are still accessible although they are no longer in scope.

Specified by:: getNamespacePrefix in interface XmlPullParser

getNamespaceUri

public java.lang.CharSequence getNamespaceUri(int pos)

Description copied from interface: XmlPullParser

Returns the namespace URI for the given position in the namespace stack If the position is out of range, an exception is thrown.

NOTE: when parser is on END_TAG then namespace prefixes that were declared in corresponding START_TAG are still accessible even though they are not in scope

Specified by:: getNamespaceUri in interface XmlPullParser

getPositionDescription

public java.lang.CharSequence getPositionDescription()

Description copied from interface: XmlPullParser

Returns a short text describing the current parser state, including the position, a description of the current event and the data source if known. This method is especially useful to provide meaningful error messages and for debugging purposes.

Specified by:: getPositionDescription in interface XmlPullParser

getText

public java.lang.CharSequence getText()

Description copied from interface: XmlPullParser

Returns the text content of the current event as CharSequence. The value returned depends on current event type, for example for TEXT event it is element content (this is typical case when next() is used). See description of nextToken() for detailed description of possible returned values for different types of events.

NOTE: in case of ENTITY_REF, this method returns the entity replacement text (or null if not available). This is the only case where getText() and getTextCharacters() return different values.

Specified by:: getText in interface XmlPullParser

See Also:: XmlPullParser.getEventType(), XmlPullParser.next(), XmlPullParser.nextToken()

getTextCharacters

public char[] getTextCharacters(int[] holderForStartAndLength)

Description copied from interface: XmlPullParser

Returns the buffer that contains the text of the current event, as well as the start offset and length relevant for the current event. See getText(), next() and nextToken() for description of possible returned values.

Please note: this buffer must not be modified and its content MAY change after a call to next() or nextToken(). This method will always return the same value as getText(), except for ENTITY_REF. In the case of ENTITY ref, getText() returns the replacement text and this method returns the actual input buffer containing the entity name. If getText() returns null, this method returns null as well and the values returned in the holder array MUST be -1 (both start and length).

Specified by:: getTextCharacters in interface XmlPullParser

Parameters:: holderForStartAndLength - Must hold an 2-element int array into which the start offset and length values will be written.
Returns:: char buffer that contains the text of the current event (null if the current event has no text associated).
See Also:: XmlPullParser.getText(), XmlPullParser.next(), XmlPullParser.nextToken()

isAttributeDefault

public boolean isAttributeDefault(int index)

Description copied from interface: XmlPullParser

Returns if the specified attribute was not in input was declared in XML. If parser is non-validating it MUST always return false. This information is part of XML infoset:

Specified by:: isAttributeDefault in interface XmlPullParser

Parameters:: index - zero based index of attribute
Returns:: false if attribute was in input

isEmptyElementTag

public boolean isEmptyElementTag()
                          throws XmlPullParserException

Description copied from interface: XmlPullParser

Returns true if the current event is START_TAG and the tag is degenerated (e.g. <foobar/>).

NOTE: if the parser is not on START_TAG, an exception will be thrown.

Specified by:: isEmptyElementTag in interface XmlPullParser

Throws:: XmlPullParserException

isWhitespace

public boolean isWhitespace()
                     throws XmlPullParserException

Description copied from interface: XmlPullParser

Checks whether the current TEXT event contains only whitespace characters. For IGNORABLE_WHITESPACE, this is always true. For TEXT and CDSECT, false is returned when the current event text contains at least one non-white space character. For any other event type an exception is thrown.

Please note: non-validating parsers are not able to distinguish whitespace and ignorable whitespace, except from whitespace outside the root element. Ignorable whitespace is reported as separate event, which is exposed via nextToken only.

Specified by:: isWhitespace in interface XmlPullParser

Throws:: XmlPullParserException

public int next()
         throws XmlPullParserException,
                java.io.IOException

Description copied from interface: XmlPullParser

Get next parsing event - element content will be coalesced and only one TEXT event must be returned for whole element content (comments and processing instructions will be ignored and entity references must be expanded or exception mus be thrown if entity reference can not be expanded). If element content is empty (content is "") then no TEXT event will be reported.

NOTE: empty element (such as <tag/>) will be reported with two separate events: START_TAG, END_TAG - it must be so to preserve parsing equivalency of empty element to <tag></tag>. (see isEmptyElementTag ())

Specified by:: next in interface XmlPullParser

Throws:: XmlPullParserException; java.io.IOException
See Also:: XmlPullParser.isEmptyElementTag(), XmlPullParser.START_TAG, XmlPullParser.TEXT, XmlPullParser.END_TAG, XmlPullParser.END_DOCUMENT

nextTag

public int nextTag()
            throws XmlPullParserException,
                   java.io.IOException

Description copied from interface: XmlPullParser

Call next() and return event if it is START_TAG or END_TAG otherwise throw an exception. It will skip whitespace TEXT before actual tag if any.

essentially it does this

   int eventType = next();
   if(eventType == TEXT &&  isWhitespace()) {   // skip whitespace
      eventType = next();
   }
   if (eventType != START_TAG &&  eventType != END_TAG) {
      throw new XmlPullParserException("expected start or end tag", this, null);
   }
   return eventType;

Specified by:: nextTag in interface XmlPullParser

Throws:: XmlPullParserException; java.io.IOException

nextText

public java.lang.CharSequence nextText()
                                throws XmlPullParserException,
                                       java.io.IOException

Description copied from interface: XmlPullParser

If current event is START_TAG then if next element is TEXT then element content is returned or if next event is END_TAG then empty string is returned, otherwise exception is thrown. After calling this function successfully parser will be positioned on END_TAG.

The motivation for this function is to allow to parse consistently both empty elements and elements that has non empty content, for example for input:

<tag>foo</tag>

<tag></tag> (which is equivalent to <tag/> both input can be parsed with the same code:

   p.nextTag()
   p.requireEvent(p.START_TAG, "", "tag");
   String content = p.nextText();
   p.requireEvent(p.END_TAG, "", "tag");

This function together with nextTag make it very easy to parse XML that has no mixed content.

Essentially it does this

  if(getEventType() != START_TAG) {
     throw new XmlPullParserException(
       "parser must be on START_TAG to read next text", this, null);
  }
  int eventType = next();
  if(eventType == TEXT) {
     String result = getText();
     eventType = next();
     if(eventType != END_TAG) {
       throw new XmlPullParserException(
          "event TEXT it must be immediately followed by END_TAG", this, null);
      }
      return result;
  } else if(eventType == END_TAG) {
     return "";
  } else {
     throw new XmlPullParserException(
       "parser must be on START_TAG or TEXT to read text", this, null);
  }

Specified by:: nextText in interface XmlPullParser

Throws:: XmlPullParserException; java.io.IOException

setFeature

public void setFeature(java.lang.String name,
                       boolean state)
                throws XmlPullParserException

Description copied from interface: XmlPullParser

Use this call to change the general behaviour of the parser, such as namespace processing or doctype declaration handling. This method must be called before the first call to next or nextToken. Otherwise, an exception is thrown.

Example: call setFeature(FEATURE_PROCESS_NAMESPACES, true) in order to switch on namespace processing. The initial settings correspond to the properties requested from the XML Pull Parser factory. If none were requested, all feautures are deactivated by default.

Specified by:: setFeature in interface XmlPullParser

Throws:: XmlPullParserException - If the feature is not supported or can not be set

getFeature

public boolean getFeature(java.lang.String name)

Description copied from interface: XmlPullParser

Returns the current value of the given feature.

Please note: unknown features are always returned as false.

Specified by:: getFeature in interface XmlPullParser

Parameters:: name - The name of feature to be retrieved.
Returns:: The value of the feature.

setProperty

public void setProperty(java.lang.String name,
                        java.lang.Object value)
                 throws XmlPullParserException

Description copied from interface: XmlPullParser

Set the value of a property. The property name is any fully-qualified URI.

Specified by:: setProperty in interface XmlPullParser

Throws:: XmlPullParserException - If the property is not supported or can not be set

getProperty

public java.lang.Object getProperty(java.lang.String name)

Description copied from interface: XmlPullParser

Look up the value of a property. The property name is any fully-qualified URI.

NOTE: unknown properties are always returned as null.

Specified by:: getProperty in interface XmlPullParser

Parameters:: name - The name of property to be retrieved.
Returns:: The value of named property.

require

public void require(int type,
                    java.lang.String namespace,
                    java.lang.String name)
             throws XmlPullParserException,
                    java.io.IOException

Description copied from interface: XmlPullParser

Test if the current event is of the given type and if the namespace and name do match. null will match any namespace and any name. If the test is not passed, an exception is thrown. The exception text indicates the parser position, the expected event and the current event that is not meeting the requirement.

Essentially it does this

  if (type != getEventType()
  || (namespace != null &&  !namespace.equals( getNamespace () ) )
  || (name != null &&  !name.equals( getName() ) ) )
     throw new XmlPullParserException( "expected "+ TYPES[ type ]+getPositionDescription());

Specified by:: require in interface XmlPullParser

Throws:: XmlPullParserException; java.io.IOException

nextToken

public int nextToken()
              throws XmlPullParserException,
                     java.io.IOException

Description copied from interface: XmlPullParser

This method works similarly to next() but will expose additional event types (COMMENT, CDSECT, DOCDECL, ENTITY_REF, PROCESSING_INSTRUCTION, or IGNORABLE_WHITESPACE) if they are available in input.

If special feature FEATURE_XML_ROUNDTRIP (identified by URI: http://xmlpull.org/v1/doc/features.html#xml-roundtrip) is enabled it is possible to do XML document round trip ie. reproduce exectly on output the XML input using getText(): returned content is always unnormalized (exactly as in input). Otherwise returned content is end-of-line normalized as described XML 1.0 End-of-Line Handling and. Also when this feature is enabled exact content of START_TAG, END_TAG, DOCDECL and PROCESSING_INSTRUCTION is available.

Here is the list of tokens that can be returned from nextToken() and what getText() and getTextCharacters() returns:

START_DOCUMENT

null

END_DOCUMENT

null

START_TAG

null unless FEATURE_XML_ROUNDTRIP enabled and then returns XML tag, ex: <tag attr='val'>

END_TAG

null unless FEATURE_XML_ROUNDTRIP id enabled and then returns XML tag, ex: </tag>

TEXT

return element content.
Note: that element content may be delivered in multiple consecutive TEXT events.

IGNORABLE_WHITESPACE

return characters that are determined to be ignorable white space. If the FEATURE_XML_ROUNDTRIP is enabled all whitespace content outside root element will always reported as IGNORABLE_WHITESPACE otherise rteporting is optional.
Note: that element content may be delevered in multiple consecutive IGNORABLE_WHITESPACE events.

CDSECT

return text inside CDATA (ex. 'fo<o' from <!CDATA[fo<o]]>)

PROCESSING_INSTRUCTION

if FEATURE_XML_ROUNDTRIP is true return exact PI content ex: 'pi foo' from <?pi foo?> otherwise it may be exact PI content or concatenation of PI target, space and data so for example for <?target data?> string "target data" may be returned if FEATURE_XML_ROUNDTRIP is false.

COMMENT

return comment content ex. 'foo bar' from

ENTITY_REF

getText() MUST return entity replacement text if PROCESS_DOCDECL is false otherwise getText() MAY return null, additionally getTextCharacters() MUST return entity name (for example 'entity_name' for &entity_name;).
NOTE: this is the only place where value returned from getText() and getTextCharacters() are different
NOTE: it is user responsibility to resolve entity reference if PROCESS_DOCDECL is false and there is no entity replacement text set in defineEntityReplacementText() method (getText() will be null)
NOTE: character entities (ex.  ) and standard entities such as & < > " ' are reported as well and are not reported as TEXT tokens but as ENTITY_REF tokens! This requirement is added to allow to do roundtrip of XML documents!

DOCDECL

if FEATURE_XML_ROUNDTRIP is true or PROCESS_DOCDECL is false then return what is inside of DOCDECL for example it returns:

 " titlepage SYSTEM "http://www.foo.bar/dtds/typo.dtd"
 [<!ENTITY % active.links "INCLUDE">]"

for input document that contained:

 &lt;!DOCTYPE titlepage SYSTEM "http://www.foo.bar/dtds/typo.dtd"
 [&lt;!ENTITY % active.links "INCLUDE">]></pre>
 otherwise if FEATURE_XML_ROUNDTRIP is false and PROCESS_DOCDECL is true
    then what is returned is undefined (it may be even null)
 </dd>
 </dl>

 <p><strong>NOTE:</strong> there is no gurantee that there will only one TEXT or
 IGNORABLE_WHITESPACE event from nextToken() as parser may chose to deliver element content in
 multiple tokens (dividing element content into chunks)

 <p><strong>NOTE:</strong> whether returned text of token is end-of-line normalized
  is depending on FEATURE_XML_ROUNDTRIP.

 <p><strong>NOTE:</strong> XMLDecl (&lt;?xml ...?&gt;) is not reported but its content
 is available through optional properties (see class description above).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../javolution/xml/pull/XmlPullParser.html#nextToken()">nextToken</A></CODE> in interface <CODE><A HREF="../../../javolution/xml/pull/XmlPullParser.html" title="interface in javolution.xml.pull">XmlPullParser</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../javolution/xml/pull/XmlPullParserException.html" title="class in javolution.xml.pull">XmlPullParserException</A></CODE>
<DD><CODE>java.io.IOException</CODE><DT><B>See Also:</B><DD><A HREF="../../../javolution/xml/pull/XmlPullParser.html#next()"><CODE>XmlPullParser.next()</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#START_TAG"><CODE>XmlPullParser.START_TAG</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#TEXT"><CODE>XmlPullParser.TEXT</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#END_TAG"><CODE>XmlPullParser.END_TAG</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#END_DOCUMENT"><CODE>XmlPullParser.END_DOCUMENT</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#COMMENT"><CODE>XmlPullParser.COMMENT</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#DOCDECL"><CODE>XmlPullParser.DOCDECL</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#PROCESSING_INSTRUCTION"><CODE>XmlPullParser.PROCESSING_INSTRUCTION</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#ENTITY_REF"><CODE>XmlPullParser.ENTITY_REF</CODE></A>, 
<A HREF="../../../javolution/xml/pull/XmlPullParser.html#IGNORABLE_WHITESPACE"><CODE>XmlPullParser.IGNORABLE_WHITESPACE</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../javolution/lang/Reusable.html#reset()">Reusable</A></CODE></B></DD>
<DD>Resets the internal state of this object to its default values.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../javolution/lang/Reusable.html#reset()">reset</A></CODE> in interface <CODE><A HREF="../../../javolution/lang/Reusable.html" title="interface in javolution.lang">Reusable</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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javolution.xml.pull Class XmlPullParserImpl

FEATURE_IGNORE_WHITESPACE

XmlPullParserImpl

setInput

setInput

setInput

setInput

defineEntityReplacementText

getSaxAttributes

getAttributeCount

getAttributeName

getAttributeNamespace

getAttributePrefix

getAttributeType

getAttributeValue

getAttributeValue

getDepth

getEventType

getInputEncoding

getLineNumber

getColumnNumber

getName

getNamespace

getPrefix

getQName

getNamespace

getNamespaceCount

getNamespacePrefix

getNamespaceUri

getPositionDescription

getText

getTextCharacters

isAttributeDefault

isEmptyElementTag

isWhitespace

next

nextTag

nextText

setFeature

getFeature

setProperty

getProperty

require

nextToken

javolution.xml.pull
Class XmlPullParserImpl