diff options
Diffstat (limited to 'src/com/sun/xml/internal/stream/XMLEventReaderImpl.java')
| -rw-r--r-- | src/com/sun/xml/internal/stream/XMLEventReaderImpl.java | 287 |
1 files changed, 0 insertions, 287 deletions
diff --git a/src/com/sun/xml/internal/stream/XMLEventReaderImpl.java b/src/com/sun/xml/internal/stream/XMLEventReaderImpl.java deleted file mode 100644 index ee4103a..0000000 --- a/src/com/sun/xml/internal/stream/XMLEventReaderImpl.java +++ /dev/null @@ -1,287 +0,0 @@ -/* - * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package com.sun.xml.internal.stream; - -import com.sun.xml.internal.stream.events.XMLEventAllocatorImpl; -import java.util.NoSuchElementException; -import javax.xml.stream.XMLInputFactory; -import javax.xml.stream.XMLStreamConstants; -import javax.xml.stream.XMLStreamException; -import javax.xml.stream.XMLStreamReader; -import javax.xml.stream.events.EntityReference; -import javax.xml.stream.events.XMLEvent; -import javax.xml.stream.util.XMLEventAllocator; - -/** - * @author @author Neeraj Bajaj Sun Microsystems - * - */ - -public class XMLEventReaderImpl implements javax.xml.stream.XMLEventReader{ - - protected XMLStreamReader fXMLReader ; - protected XMLEventAllocator fXMLEventAllocator; - - //only constructor will do because we delegate everything to underlying XMLStreamReader - public XMLEventReaderImpl(XMLStreamReader reader) throws XMLStreamException { - fXMLReader = reader ; - fXMLEventAllocator = (XMLEventAllocator)reader.getProperty(XMLInputFactory.ALLOCATOR); - if(fXMLEventAllocator == null){ - fXMLEventAllocator = new XMLEventAllocatorImpl(); - } - fPeekedEvent = fXMLEventAllocator.allocate(fXMLReader); - } - - - public boolean hasNext() { - //if we have the peeked event return 'true' - if(fPeekedEvent != null)return true; - //this is strange XMLStreamReader throws XMLStreamException - //XMLEventReader doesn't throw XMLStreamException - boolean next = false ; - try{ - next = fXMLReader.hasNext(); - }catch(XMLStreamException ex){ - return false; - } - return next ; - } - - - public XMLEvent nextEvent() throws XMLStreamException { - //if application peeked return the peeked event - if(fPeekedEvent != null){ - fLastEvent = fPeekedEvent ; - fPeekedEvent = null; - return fLastEvent ; - } - else if(fXMLReader.hasNext()){ - //advance the reader to next state. - fXMLReader.next(); - return fLastEvent = fXMLEventAllocator.allocate(fXMLReader); - } - else{ - fLastEvent = null; - throw new NoSuchElementException(); - } - } - - public void remove(){ - //remove of the event is not supported. - throw new java.lang.UnsupportedOperationException(); - } - - - public void close() throws XMLStreamException { - fXMLReader.close(); - } - - /** Reads the content of a text-only element. Precondition: - * the current event is START_ELEMENT. Postcondition: - * The current event is the corresponding END_ELEMENT. - * @throws XMLStreamException if the current event is not a START_ELEMENT - * or if a non text element is encountered - */ - public String getElementText() throws XMLStreamException { - //we have to keep reference to the 'last event' of the stream to be able - //to make this check - is there another way ? - nb. - if(fLastEvent.getEventType() != XMLEvent.START_ELEMENT){ - throw new XMLStreamException( - "parser must be on START_ELEMENT to read next text", fLastEvent.getLocation()); - } - - // STag content ETag - //[43] content ::= CharData? ((element | Reference | CDSect | PI | Comment) CharData?)* - - //<foo>....some long text say in KB and underlying parser reports multiple character - // but getElementText() events....</foo> - - String data = null; - //having a peeked event makes things really worse -- we have to test the first event - if(fPeekedEvent != null){ - XMLEvent event = fPeekedEvent ; - fPeekedEvent = null; - int type = event.getEventType(); - - if( type == XMLEvent.CHARACTERS || type == XMLEvent.SPACE || - type == XMLEvent.CDATA){ - data = event.asCharacters().getData(); - } - else if(type == XMLEvent.ENTITY_REFERENCE){ - data = ((EntityReference)event).getDeclaration().getReplacementText(); - } - else if(type == XMLEvent.COMMENT || type == XMLEvent.PROCESSING_INSTRUCTION){ - //ignore - } else if(type == XMLEvent.START_ELEMENT) { - throw new XMLStreamException( - "elementGetText() function expects text only elment but START_ELEMENT was encountered.", event.getLocation()); - }else if(type == XMLEvent.END_ELEMENT){ - return ""; - } - - //create the string buffer and add initial data - StringBuffer buffer = new StringBuffer(); - if(data != null && data.length() > 0 ) { - buffer.append(data); - } - //get the next event -- we should stop at END_ELEMENT but it can be any thing - //things are worse when implementing this function in XMLEventReader because - //there isn't any function called getText() which can get values for - //space, cdata, characters and entity reference - //nextEvent() would also set the last event. - event = nextEvent(); - while(event.getEventType() != XMLEvent.END_ELEMENT){ - if( type == XMLEvent.CHARACTERS || type == XMLEvent.SPACE || - type == XMLEvent.CDATA){ - data = event.asCharacters().getData(); - } - else if(type == XMLEvent.ENTITY_REFERENCE){ - data = ((EntityReference)event).getDeclaration().getReplacementText(); - } - else if(type == XMLEvent.COMMENT || type == XMLEvent.PROCESSING_INSTRUCTION){ - //ignore - } else if(type == XMLEvent.END_DOCUMENT) { - throw new XMLStreamException("unexpected end of document when reading element text content"); - } else if(type == XMLEvent.START_ELEMENT) { - throw new XMLStreamException( - "elementGetText() function expects text only elment but START_ELEMENT was encountered.", event.getLocation()); - } else { - throw new XMLStreamException( - "Unexpected event type "+ type, event.getLocation()); - } - //add the data to the buffer - if(data != null && data.length() > 0 ) { - buffer.append(data); - } - event = nextEvent(); - } - return buffer.toString(); - }//if (fPeekedEvent != null) - - //if there was no peeked, delegate everything to fXMLReader - //update the last event before returning the text - data = fXMLReader.getElementText(); - fLastEvent = fXMLEventAllocator.allocate(fXMLReader); - return data; - } - - /** Get the value of a feature/property from the underlying implementation - * @param name The name of the property - * @return The value of the property - * @throws IllegalArgumentException if the property is not supported - */ - public Object getProperty(java.lang.String name) throws java.lang.IllegalArgumentException { - return fXMLReader.getProperty(name) ; - } - - /** Skips any insignificant space events until a START_ELEMENT or - * END_ELEMENT is reached. If anything other than space characters are - * encountered, an exception is thrown. This method should - * be used when processing element-only content because - * the parser is not able to recognize ignorable whitespace if - * the DTD is missing or not interpreted. - * @throws XMLStreamException if anything other than space characters are encountered - */ - public XMLEvent nextTag() throws XMLStreamException { - //its really a pain if there is peeked event before calling nextTag() - if(fPeekedEvent != null){ - //check the peeked event first. - XMLEvent event = fPeekedEvent; - fPeekedEvent = null ; - int eventType = event.getEventType(); - //if peeked event is whitespace move to the next event - //if peeked event is PI or COMMENT move to the next event - if( (event.isCharacters() && event.asCharacters().isWhiteSpace()) - || eventType == XMLStreamConstants.PROCESSING_INSTRUCTION - || eventType == XMLStreamConstants.COMMENT - || eventType == XMLStreamConstants.START_DOCUMENT){ - event = nextEvent(); - eventType = event.getEventType(); - } - - //we have to have the while loop because there can be many PI or comment event in sucession - while((event.isCharacters() && event.asCharacters().isWhiteSpace()) - || eventType == XMLStreamConstants.PROCESSING_INSTRUCTION - || eventType == XMLStreamConstants.COMMENT){ - - event = nextEvent(); - eventType = event.getEventType(); - } - - if (eventType != XMLStreamConstants.START_ELEMENT && eventType != XMLStreamConstants.END_ELEMENT) { - throw new XMLStreamException("expected start or end tag", event.getLocation()); - } - return event; - } - - //if there is no peeked event -- delegate the work of getting next event to fXMLReader - fXMLReader.nextTag(); - return (fLastEvent = fXMLEventAllocator.allocate(fXMLReader)); - } - - public Object next() { - Object object = null; - try{ - object = nextEvent(); - }catch(XMLStreamException streamException){ - fLastEvent = null ; - //don't swallow the cause - NoSuchElementException e = new NoSuchElementException(streamException.getMessage()); - e.initCause(streamException.getCause()); - throw e; - - } - return object; - } - - public XMLEvent peek() throws XMLStreamException{ - //if someone call peek() two times we should just return the peeked event - //this is reset if we call next() or nextEvent() - if(fPeekedEvent != null) return fPeekedEvent; - - if(hasNext()){ - //revisit: we can implement peek() by calling underlying reader to advance - // the stream and returning the event without the knowledge of the user - // that the stream was advanced but the point is we are advancing the stream - //here. -- nb. - - // Is there any application that relies on this behavior ? - //Can it be an application knows that there is particularly very large 'comment' section - //or character data which it doesn't want to read or to be returned as event - //But as of now we are creating every event but it can be optimized not to create - // the event. - fXMLReader.next(); - fPeekedEvent = fXMLEventAllocator.allocate(fXMLReader); - return fPeekedEvent; - }else{ - return null; - } - }//peek() - - private XMLEvent fPeekedEvent; - private XMLEvent fLastEvent; - -}//XMLEventReaderImpl |