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- All Superinterfaces:
- XMLStreamConstants
- All Known Implementing Classes:
- StreamReaderDelegate
public interface XMLStreamReader extends XMLStreamConstants
The XMLStreamReader interface allows forward, read-only access to XML. It is designed to be the lowest level and most efficient way to read XML data.The XMLStreamReader is designed to iterate over XML using next() and hasNext(). The data can be accessed using methods such as getEventType(), getNamespaceURI(), getLocalName() and getText();
The next() method causes the reader to read the next parse event. The next() method returns an integer which identifies the type of event just read.
The event type can be determined using getEventType().
Parsing events are defined as the XML Declaration, a DTD, start tag, character data, white space, end tag, comment, or processing instruction. An attribute or namespace event may be encountered at the root level of a document as the result of a query operation.
For XML 1.0 compliance an XML processor must pass the identifiers of declared unparsed entities, notation declarations and their associated identifiers to the application. This information is provided through the property API on this interface. The following two properties allow access to this information: javax.xml.stream.notations and javax.xml.stream.entities. When the current event is a DTD the following call will return a list of Notations
List l = (List) getProperty("javax.xml.stream.notations");
The following call will return a list of entity declarations:List l = (List) getProperty("javax.xml.stream.entities");
These properties can only be accessed during a DTD event and are defined to return null if the information is not available.The following table describes which methods are valid in what state. If a method is called in an invalid state the method will throw a java.lang.IllegalStateException.
Valid methods for each state Event Type Valid Methods All States getProperty(), hasNext(), require(), close(), getNamespaceURI(), isStartElement(), isEndElement(), isCharacters(), isWhiteSpace(), getNamespaceContext(), getEventType(),getLocation(), hasText(), hasName() START_ELEMENT next(), getName(), getLocalName(), hasName(), getPrefix(), getAttributeXXX(), isAttributeSpecified(), getNamespaceXXX(), getElementText(), nextTag() ATTRIBUTE next(), nextTag() getAttributeXXX(), isAttributeSpecified(), NAMESPACE next(), nextTag() getNamespaceXXX() END_ELEMENT next(), getName(), getLocalName(), hasName(), getPrefix(), getNamespaceXXX(), nextTag() CHARACTERS next(), getTextXXX(), nextTag() CDATA next(), getTextXXX(), nextTag() COMMENT next(), getTextXXX(), nextTag() SPACE next(), getTextXXX(), nextTag() START_DOCUMENT next(), getEncoding(), getVersion(), isStandalone(), standaloneSet(), getCharacterEncodingScheme(), nextTag() END_DOCUMENT close() PROCESSING_INSTRUCTION next(), getPITarget(), getPIData(), nextTag() ENTITY_REFERENCE next(), getLocalName(), getText(), nextTag() DTD next(), getText(), nextTag() - Since:
- 1.6
- See Also:
XMLEvent
,XMLInputFactory
,XMLStreamWriter
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Field Summary
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Fields inherited from interface javax.xml.stream.XMLStreamConstants
ATTRIBUTE, CDATA, CHARACTERS, COMMENT, DTD, END_DOCUMENT, END_ELEMENT, ENTITY_DECLARATION, ENTITY_REFERENCE, NAMESPACE, NOTATION_DECLARATION, PROCESSING_INSTRUCTION, SPACE, START_DOCUMENT, START_ELEMENT
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Method Summary
Methods Modifier and Type Method and Description void
close()
Frees any resources associated with this Reader.int
getAttributeCount()
Returns the count of attributes on this START_ELEMENT, this method is only valid on a START_ELEMENT or ATTRIBUTE.String
getAttributeLocalName(int index)
Returns the localName of the attribute at the provided indexQName
getAttributeName(int index)
Returns the qname of the attribute at the provided indexString
getAttributeNamespace(int index)
Returns the namespace of the attribute at the provided indexString
getAttributePrefix(int index)
Returns the prefix of this attribute at the provided indexString
getAttributeType(int index)
Returns the XML type of the attribute at the provided indexString
getAttributeValue(int index)
Returns the value of the attribute at the indexString
getAttributeValue(String namespaceURI, String localName)
Returns the normalized attribute value of the attribute with the namespace and localName If the namespaceURI is null the namespace is not checked for equalityString
getCharacterEncodingScheme()
Returns the character encoding declared on the xml declaration Returns null if none was declaredString
getElementText()
Reads the content of a text-only element, an exception is thrown if this is not a text-only element.String
getEncoding()
Return input encoding if known or null if unknown.int
getEventType()
Returns an integer code that indicates the type of the event the cursor is pointing to.String
getLocalName()
Returns the (local) name of the current event.Location
getLocation()
Return the current location of the processor.QName
getName()
Returns a QName for the current START_ELEMENT or END_ELEMENT eventNamespaceContext
getNamespaceContext()
Returns a read only namespace context for the current position.int
getNamespaceCount()
Returns the count of namespaces declared on this START_ELEMENT or END_ELEMENT, this method is only valid on a START_ELEMENT, END_ELEMENT or NAMESPACE.String
getNamespacePrefix(int index)
Returns the prefix for the namespace declared at the index.String
getNamespaceURI()
If the current event is a START_ELEMENT or END_ELEMENT this method returns the URI of the prefix or the default namespace.String
getNamespaceURI(int index)
Returns the uri for the namespace declared at the index.String
getNamespaceURI(String prefix)
Return the uri for the given prefix.String
getPIData()
Get the data section of a processing instructionString
getPITarget()
Get the target of a processing instructionString
getPrefix()
Returns the prefix of the current event or null if the event does not have a prefixObject
getProperty(String name)
Get the value of a feature/property from the underlying implementationString
getText()
Returns the current value of the parse event as a string, this returns the string value of a CHARACTERS event, returns the value of a COMMENT, the replacement value for an ENTITY_REFERENCE, the string value of a CDATA section, the string value for a SPACE event, or the String value of the internal subset of the DTD.char[]
getTextCharacters()
Returns an array which contains the characters from this event.int
getTextCharacters(int sourceStart, char[] target, int targetStart, int length)
Gets the the text associated with a CHARACTERS, SPACE or CDATA event.int
getTextLength()
Returns the length of the sequence of characters for this Text event within the text character array.int
getTextStart()
Returns the offset into the text character array where the first character (of this text event) is stored.String
getVersion()
Get the xml version declared on the xml declaration Returns null if none was declaredboolean
hasName()
returns true if the current event has a name (is a START_ELEMENT or END_ELEMENT) returns false otherwiseboolean
hasNext()
Returns true if there are more parsing events and false if there are no more events.boolean
hasText()
Return true if the current event has text, false otherwise The following events have text: CHARACTERS,DTD ,ENTITY_REFERENCE, COMMENT, SPACEboolean
isAttributeSpecified(int index)
Returns a boolean which indicates if this attribute was created by defaultboolean
isCharacters()
Returns true if the cursor points to a character data eventboolean
isEndElement()
Returns true if the cursor points to an end tag (otherwise false)boolean
isStandalone()
Get the standalone declaration from the xml declarationboolean
isStartElement()
Returns true if the cursor points to a start tag (otherwise false)boolean
isWhiteSpace()
Returns true if the cursor points to a character data event that consists of all whitespaceint
next()
Get next parsing event - a processor may return all contiguous character data in a single chunk, or it may split it into several chunks.int
nextTag()
Skips any white space (isWhiteSpace() returns true), COMMENT, or PROCESSING_INSTRUCTION, until a START_ELEMENT or END_ELEMENT is reached.void
require(int type, String namespaceURI, String localName)
Test if the current event is of the given type and if the namespace and name match the current namespace and name of the current event.boolean
standaloneSet()
Checks if standalone was set in the document
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Method Detail
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getProperty
Object getProperty(String name) throws IllegalArgumentException
Get the value of a feature/property from the underlying implementation- Parameters:
name
- The name of the property, may not be null- Returns:
- The value of the property
- Throws:
IllegalArgumentException
- if name is null
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next
int next() throws XMLStreamException
Get next parsing event - a processor may return all contiguous character data in a single chunk, or it may split it into several chunks. If the property javax.xml.stream.isCoalescing is set to true element content must be coalesced and only one CHARACTERS event must be returned for contiguous element content or CDATA Sections. By default entity references must be expanded and reported transparently to the application. An exception will be thrown if an entity reference cannot be expanded. If element content is empty (i.e. content is "") then no CHARACTERS event will be reported.Given the following XML:
<foo><!--description-->content text<![CDATA[<greeting>Hello</greeting>]]>other content</foo>
The behavior of calling next() when being on foo will be:
1- the comment (COMMENT)
2- then the characters section (CHARACTERS)
3- then the CDATA section (another CHARACTERS)
4- then the next characters section (another CHARACTERS)
5- then the END_ELEMENT
NOTE: empty element (such as <tag/>) will be reported with two separate events: START_ELEMENT, END_ELEMENT - This preserves parsing equivalency of empty element to <tag></tag>. This method will throw an IllegalStateException if it is called after hasNext() returns false.
- Returns:
- the integer code corresponding to the current parse event
- Throws:
NoSuchElementException
- if this is called when hasNext() returns falseXMLStreamException
- if there is an error processing the underlying XML source- See Also:
XMLEvent
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require
void require(int type, String namespaceURI, String localName) throws XMLStreamException
Test if the current event is of the given type and if the namespace and name match the current namespace and name of the current event. If the namespaceURI is null it is not checked for equality, if the localName is null it is not checked for equality.- Parameters:
type
- the event typenamespaceURI
- the uri of the event, may be nulllocalName
- the localName of the event, may be null- Throws:
XMLStreamException
- if the required values are not matched.
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getElementText
String getElementText() throws XMLStreamException
Reads the content of a text-only element, an exception is thrown if this is not a text-only element. Regardless of value of javax.xml.stream.isCoalescing this method always returns coalesced content.
Precondition: the current event is START_ELEMENT.
Postcondition: the current event is the corresponding END_ELEMENT.
The method does the following (implementations are free to optimized but must do equivalent processing):if(getEventType() != XMLStreamConstants.START_ELEMENT) { throw new XMLStreamException( "parser must be on START_ELEMENT to read next text", getLocation()); } int eventType = next(); StringBuffer content = new StringBuffer(); while(eventType != XMLStreamConstants.END_ELEMENT ) { if(eventType == XMLStreamConstants.CHARACTERS || eventType == XMLStreamConstants.CDATA || eventType == XMLStreamConstants.SPACE || eventType == XMLStreamConstants.ENTITY_REFERENCE) { buf.append(getText()); } else if(eventType == XMLStreamConstants.PROCESSING_INSTRUCTION || eventType == XMLStreamConstants.COMMENT) { // skipping } else if(eventType == XMLStreamConstants.END_DOCUMENT) { throw new XMLStreamException( "unexpected end of document when reading element text content", this); } else if(eventType == XMLStreamConstants.START_ELEMENT) { throw new XMLStreamException( "element text content may not contain START_ELEMENT", getLocation()); } else { throw new XMLStreamException( "Unexpected event type "+eventType, getLocation()); } eventType = next(); } return buf.toString();
- Throws:
XMLStreamException
- if the current event is not a START_ELEMENT or if a non text element is encountered
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nextTag
int nextTag() throws XMLStreamException
Skips any white space (isWhiteSpace() returns true), COMMENT, or PROCESSING_INSTRUCTION, until a START_ELEMENT or END_ELEMENT is reached. If other than white space characters, COMMENT, PROCESSING_INSTRUCTION, START_ELEMENT, END_ELEMENT are encountered, an exception is thrown. This method should be used when processing element-only content seperated by white space.
Precondition: none
Postcondition: the current event is START_ELEMENT or END_ELEMENT and cursor may have moved over any whitespace event.
Essentially it does the following (implementations are free to optimized but must do equivalent processing):int eventType = next(); while((eventType == XMLStreamConstants.CHARACTERS && isWhiteSpace()) // skip whitespace || (eventType == XMLStreamConstants.CDATA && isWhiteSpace()) // skip whitespace || eventType == XMLStreamConstants.SPACE || eventType == XMLStreamConstants.PROCESSING_INSTRUCTION || eventType == XMLStreamConstants.COMMENT ) { eventType = next(); } if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) { throw new String XMLStreamException("expected start or end tag", getLocation()); } return eventType;
- Returns:
- the event type of the element read (START_ELEMENT or END_ELEMENT)
- Throws:
XMLStreamException
- if the current event is not white space, PROCESSING_INSTRUCTION, START_ELEMENT or END_ELEMENTNoSuchElementException
- if this is called when hasNext() returns false
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hasNext
boolean hasNext() throws XMLStreamException
Returns true if there are more parsing events and false if there are no more events. This method will return false if the current state of the XMLStreamReader is END_DOCUMENT- Returns:
- true if there are more events, false otherwise
- Throws:
XMLStreamException
- if there is a fatal error detecting the next state
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close
void close() throws XMLStreamException
Frees any resources associated with this Reader. This method does not close the underlying input source.- Throws:
XMLStreamException
- if there are errors freeing associated resources
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getNamespaceURI
String getNamespaceURI(String prefix)
Return the uri for the given prefix. The uri returned depends on the current state of the processor.NOTE:The 'xml' prefix is bound as defined in Namespaces in XML specification to "http://www.w3.org/XML/1998/namespace".
NOTE: The 'xmlns' prefix must be resolved to following namespace http://www.w3.org/2000/xmlns/
- Parameters:
prefix
- The prefix to lookup, may not be null- Returns:
- the uri bound to the given prefix or null if it is not bound
- Throws:
IllegalArgumentException
- if the prefix is null
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isStartElement
boolean isStartElement()
Returns true if the cursor points to a start tag (otherwise false)- Returns:
- true if the cursor points to a start tag, false otherwise
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isEndElement
boolean isEndElement()
Returns true if the cursor points to an end tag (otherwise false)- Returns:
- true if the cursor points to an end tag, false otherwise
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isCharacters
boolean isCharacters()
Returns true if the cursor points to a character data event- Returns:
- true if the cursor points to character data, false otherwise
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isWhiteSpace
boolean isWhiteSpace()
Returns true if the cursor points to a character data event that consists of all whitespace- Returns:
- true if the cursor points to all whitespace, false otherwise
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getAttributeValue
String getAttributeValue(String namespaceURI, String localName)
Returns the normalized attribute value of the attribute with the namespace and localName If the namespaceURI is null the namespace is not checked for equality- Parameters:
namespaceURI
- the namespace of the attributelocalName
- the local name of the attribute, cannot be null- Returns:
- returns the value of the attribute , returns null if not found
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeCount
int getAttributeCount()
Returns the count of attributes on this START_ELEMENT, this method is only valid on a START_ELEMENT or ATTRIBUTE. This count excludes namespace definitions. Attribute indices are zero-based.- Returns:
- returns the number of attributes
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeName
QName getAttributeName(int index)
Returns the qname of the attribute at the provided index- Parameters:
index
- the position of the attribute- Returns:
- the QName of the attribute
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeNamespace
String getAttributeNamespace(int index)
Returns the namespace of the attribute at the provided index- Parameters:
index
- the position of the attribute- Returns:
- the namespace URI (can be null)
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeLocalName
String getAttributeLocalName(int index)
Returns the localName of the attribute at the provided index- Parameters:
index
- the position of the attribute- Returns:
- the localName of the attribute
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributePrefix
String getAttributePrefix(int index)
Returns the prefix of this attribute at the provided index- Parameters:
index
- the position of the attribute- Returns:
- the prefix of the attribute
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeType
String getAttributeType(int index)
Returns the XML type of the attribute at the provided index- Parameters:
index
- the position of the attribute- Returns:
- the XML type of the attribute
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getAttributeValue
String getAttributeValue(int index)
Returns the value of the attribute at the index- Parameters:
index
- the position of the attribute- Returns:
- the attribute value
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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isAttributeSpecified
boolean isAttributeSpecified(int index)
Returns a boolean which indicates if this attribute was created by default- Parameters:
index
- the position of the attribute- Returns:
- true if this is a default attribute
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or ATTRIBUTE
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getNamespaceCount
int getNamespaceCount()
Returns the count of namespaces declared on this START_ELEMENT or END_ELEMENT, this method is only valid on a START_ELEMENT, END_ELEMENT or NAMESPACE. On an END_ELEMENT the count is of the namespaces that are about to go out of scope. This is the equivalent of the information reported by SAX callback for an end element event.- Returns:
- returns the number of namespace declarations on this specific element
- Throws:
IllegalStateException
- if this is not a START_ELEMENT, END_ELEMENT or NAMESPACE
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getNamespacePrefix
String getNamespacePrefix(int index)
Returns the prefix for the namespace declared at the index. Returns null if this is the default namespace declaration- Parameters:
index
- the position of the namespace declaration- Returns:
- returns the namespace prefix
- Throws:
IllegalStateException
- if this is not a START_ELEMENT, END_ELEMENT or NAMESPACE
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getNamespaceURI
String getNamespaceURI(int index)
Returns the uri for the namespace declared at the index.- Parameters:
index
- the position of the namespace declaration- Returns:
- returns the namespace uri
- Throws:
IllegalStateException
- if this is not a START_ELEMENT, END_ELEMENT or NAMESPACE
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getNamespaceContext
NamespaceContext getNamespaceContext()
Returns a read only namespace context for the current position. The context is transient and only valid until a call to next() changes the state of the reader.- Returns:
- return a namespace context
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getEventType
int getEventType()
Returns an integer code that indicates the type of the event the cursor is pointing to.
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getText
String getText()
Returns the current value of the parse event as a string, this returns the string value of a CHARACTERS event, returns the value of a COMMENT, the replacement value for an ENTITY_REFERENCE, the string value of a CDATA section, the string value for a SPACE event, or the String value of the internal subset of the DTD. If an ENTITY_REFERENCE has been resolved, any character data will be reported as CHARACTERS events.- Returns:
- the current text or null
- Throws:
IllegalStateException
- if this state is not a valid text state.
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getTextCharacters
char[] getTextCharacters()
Returns an array which contains the characters from this event. This array should be treated as read-only and transient. I.e. the array will contain the text characters until the XMLStreamReader moves on to the next event. Attempts to hold onto the character array beyond that time or modify the contents of the array are breaches of the contract for this interface.- Returns:
- the current text or an empty array
- Throws:
IllegalStateException
- if this state is not a valid text state.
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getTextCharacters
int getTextCharacters(int sourceStart, char[] target, int targetStart, int length) throws XMLStreamException
Gets the the text associated with a CHARACTERS, SPACE or CDATA event. Text starting a "sourceStart" is copied into "target" starting at "targetStart". Up to "length" characters are copied. The number of characters actually copied is returned. The "sourceStart" argument must be greater or equal to 0 and less than or equal to the number of characters associated with the event. Usually, one requests text starting at a "sourceStart" of 0. If the number of characters actually copied is less than the "length", then there is no more text. Otherwise, subsequent calls need to be made until all text has been retrieved. For example:int length = 1024; char[] myBuffer = new char[ length ]; for ( int sourceStart = 0 ; ; sourceStart += length ) { int nCopied = stream.getTextCharacters( sourceStart, myBuffer, 0, length ); if (nCopied < length) break; }
XMLStreamException may be thrown if there are any XML errors in the underlying source. The "targetStart" argument must be greater than or equal to 0 and less than the length of "target", Length must be greater than 0 and "targetStart + length" must be less than or equal to length of "target".- Parameters:
sourceStart
- the index of the first character in the source array to copytarget
- the destination arraytargetStart
- the start offset in the target arraylength
- the number of characters to copy- Returns:
- the number of characters actually copied
- Throws:
XMLStreamException
- if the underlying XML source is not well-formedIndexOutOfBoundsException
- if targetStart < 0 or > than the length of targetIndexOutOfBoundsException
- if length < 0 or targetStart + length > length of targetUnsupportedOperationException
- if this method is not supportedNullPointerException
- is if target is null
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getTextStart
int getTextStart()
Returns the offset into the text character array where the first character (of this text event) is stored.- Throws:
IllegalStateException
- if this state is not a valid text state.
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getTextLength
int getTextLength()
Returns the length of the sequence of characters for this Text event within the text character array.- Throws:
IllegalStateException
- if this state is not a valid text state.
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getEncoding
String getEncoding()
Return input encoding if known or null if unknown.- Returns:
- the encoding of this instance or null
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hasText
boolean hasText()
Return true if the current event has text, false otherwise The following events have text: CHARACTERS,DTD ,ENTITY_REFERENCE, COMMENT, SPACE
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getLocation
Location getLocation()
Return the current location of the processor. If the Location is unknown the processor should return an implementation of Location that returns -1 for the location and null for the publicId and systemId. The location information is only valid until next() is called.
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getName
QName getName()
Returns a QName for the current START_ELEMENT or END_ELEMENT event- Returns:
- the QName for the current START_ELEMENT or END_ELEMENT event
- Throws:
IllegalStateException
- if this is not a START_ELEMENT or END_ELEMENT
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getLocalName
String getLocalName()
Returns the (local) name of the current event. For START_ELEMENT or END_ELEMENT returns the (local) name of the current element. For ENTITY_REFERENCE it returns entity name. The current event must be START_ELEMENT or END_ELEMENT, or ENTITY_REFERENCE- Returns:
- the localName
- Throws:
IllegalStateException
- if this not a START_ELEMENT, END_ELEMENT or ENTITY_REFERENCE
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hasName
boolean hasName()
returns true if the current event has a name (is a START_ELEMENT or END_ELEMENT) returns false otherwise
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getNamespaceURI
String getNamespaceURI()
If the current event is a START_ELEMENT or END_ELEMENT this method returns the URI of the prefix or the default namespace. Returns null if the event does not have a prefix.- Returns:
- the URI bound to this elements prefix, the default namespace, or null
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getPrefix
String getPrefix()
Returns the prefix of the current event or null if the event does not have a prefix- Returns:
- the prefix or null
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getVersion
String getVersion()
Get the xml version declared on the xml declaration Returns null if none was declared- Returns:
- the XML version or null
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isStandalone
boolean isStandalone()
Get the standalone declaration from the xml declaration- Returns:
- true if this is standalone, or false otherwise
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standaloneSet
boolean standaloneSet()
Checks if standalone was set in the document- Returns:
- true if standalone was set in the document, or false otherwise
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getCharacterEncodingScheme
String getCharacterEncodingScheme()
Returns the character encoding declared on the xml declaration Returns null if none was declared- Returns:
- the encoding declared in the document or null
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getPITarget
String getPITarget()
Get the target of a processing instruction- Returns:
- the target or null
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getPIData
String getPIData()
Get the data section of a processing instruction- Returns:
- the data or null
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