org.apache.xml.serializer.ToTextStream Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ToTextStream.java 468654 2006-10-28 07:09:23Z minchau $
*/
package org.apache.xml.serializer;
import java.io.IOException;
import org.apache.xml.serializer.utils.MsgKey;
import org.apache.xml.serializer.utils.Utils;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* This class is not a public API.
* It is only public because it is used in other packages.
* This class converts SAX or SAX-like calls to a
* serialized document for xsl:output method of "text".
* @xsl.usage internal
*/
public class ToTextStream extends ToStream
{
/**
* Default constructor.
*/
public ToTextStream()
{
super();
}
/**
* Receive notification of the beginning of a document.
*
* The SAX parser will invoke this method only once, before any
* other methods in this interface or in DTDHandler (except for
* setDocumentLocator).
*
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
*/
protected void startDocumentInternal() throws org.xml.sax.SAXException
{
super.startDocumentInternal();
m_needToCallStartDocument = false;
// No action for the moment.
}
/**
* Receive notification of the end of a document.
*
* The SAX parser will invoke this method only once, and it will
* be the last method invoked during the parse. The parser shall
* not invoke this method until it has either abandoned parsing
* (because of an unrecoverable error) or reached the end of
* input.
*
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
*/
public void endDocument() throws org.xml.sax.SAXException
{
flushPending();
flushWriter();
if (m_tracer != null)
super.fireEndDoc();
}
/**
* Receive notification of the beginning of an element.
*
* The Parser will invoke this method at the beginning of every
* element in the XML document; there will be a corresponding
* endElement() event for every startElement() event (even when the
* element is empty). All of the element's content will be
* reported, in order, before the corresponding endElement()
* event.
*
* If the element name has a namespace prefix, the prefix will
* still be attached. Note that the attribute list provided will
* contain only attributes with explicit values (specified or
* defaulted): #IMPLIED attributes will be omitted.
*
*
* @param namespaceURI The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param name The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @param atts The attributes attached to the element, if any.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see #endElement
* @see org.xml.sax.AttributeList
*
* @throws org.xml.sax.SAXException
*/
public void startElement(
String namespaceURI, String localName, String name, Attributes atts)
throws org.xml.sax.SAXException
{
// time to fire off startElement event
if (m_tracer != null) {
super.fireStartElem(name);
this.firePseudoAttributes();
}
return;
}
/**
* Receive notification of the end of an element.
*
* The SAX parser will invoke this method at the end of every
* element in the XML document; there will be a corresponding
* startElement() event for every endElement() event (even when the
* element is empty).
*
* If the element name has a namespace prefix, the prefix will
* still be attached to the name.
*
*
* @param namespaceURI The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param name The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
*/
public void endElement(String namespaceURI, String localName, String name)
throws org.xml.sax.SAXException
{
if (m_tracer != null)
super.fireEndElem(name);
}
/**
* Receive notification of character data.
*
* The Parser will call this method to report each chunk of
* character data. SAX parsers may return all contiguous character
* data in a single chunk, or they may split it into several
* chunks; however, all of the characters in any single event
* must come from the same external entity, so that the Locator
* provides useful information.
*
* The application must not attempt to read from the array
* outside of the specified range.
*
* Note that some parsers will report whitespace using the
* ignorableWhitespace() method rather than this one (validating
* parsers must do so).
*
* @param ch The characters from the XML document.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see #ignorableWhitespace
* @see org.xml.sax.Locator
*/
public void characters(char ch[], int start, int length)
throws org.xml.sax.SAXException
{
flushPending();
try
{
if (inTemporaryOutputState()) {
/* leave characters un-processed as we are
* creating temporary output, the output generated by
* this serializer will be input to a final serializer
* later on and it will do the processing in final
* output state (not temporary output state).
*
* A "temporary" ToTextStream serializer is used to
* evaluate attribute value templates (for example),
* and the result of evaluating such a thing
* is fed into a final serializer later on.
*/
m_writer.write(ch, start, length);
}
else {
// In final output state we do process the characters!
writeNormalizedChars(ch, start, length, m_lineSepUse);
}
if (m_tracer != null)
super.fireCharEvent(ch, start, length);
}
catch(IOException ioe)
{
throw new SAXException(ioe);
}
}
/**
* If available, when the disable-output-escaping attribute is used,
* output raw text without escaping.
*
* @param ch The characters from the XML document.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
*
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*/
public void charactersRaw(char ch[], int start, int length)
throws org.xml.sax.SAXException
{
try
{
writeNormalizedChars(ch, start, length, m_lineSepUse);
}
catch(IOException ioe)
{
throw new SAXException(ioe);
}
}
/**
* Normalize the characters, but don't escape. Different from
* SerializerToXML#writeNormalizedChars because it does not attempt to do
* XML escaping at all.
*
* @param ch The characters from the XML document.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
* @param useLineSep true if the operating systems
* end-of-line separator should be output rather than a new-line character.
*
* @throws IOException
* @throws org.xml.sax.SAXException
*/
void writeNormalizedChars(
final char ch[],
final int start,
final int length,
final boolean useLineSep)
throws IOException, org.xml.sax.SAXException
{
final String encoding = getEncoding();
final java.io.Writer writer = m_writer;
final int end = start + length;
/* copy a few "constants" before the loop for performance */
final char S_LINEFEED = CharInfo.S_LINEFEED;
// This for() loop always increments i by one at the end
// of the loop. Additional increments of i adjust for when
// two input characters (a high/low UTF16 surrogate pair)
// are processed.
for (int i = start; i < end; i++) {
final char c = ch[i];
if (S_LINEFEED == c && useLineSep) {
writer.write(m_lineSep, 0, m_lineSepLen);
// one input char processed
} else if (m_encodingInfo.isInEncoding(c)) {
writer.write(c);
// one input char processed
} else if (Encodings.isHighUTF16Surrogate(c)) {
final int codePoint = writeUTF16Surrogate(c, ch, i, end);
if (codePoint != 0) {
// I think we can just emit the message,
// not crash and burn.
final String integralValue = Integer.toString(codePoint);
final String msg = Utils.messages.createMessage(
MsgKey.ER_ILLEGAL_CHARACTER,
new Object[] { integralValue, encoding });
//Older behavior was to throw the message,
//but newer gentler behavior is to write a message to System.err
//throw new SAXException(msg);
System.err.println(msg);
}
i++; // two input chars processed
} else {
// Don't know what to do with this char, it is
// not in the encoding and not a high char in
// a surrogate pair, so write out as an entity ref
if (encoding != null) {
/* The output encoding is known,
* so somthing is wrong.
*/
// not in the encoding, so write out a character reference
writer.write('&');
writer.write('#');
writer.write(Integer.toString(c));
writer.write(';');
// I think we can just emit the message,
// not crash and burn.
final String integralValue = Integer.toString(c);
final String msg = Utils.messages.createMessage(
MsgKey.ER_ILLEGAL_CHARACTER,
new Object[] { integralValue, encoding });
//Older behavior was to throw the message,
//but newer gentler behavior is to write a message to System.err
//throw new SAXException(msg);
System.err.println(msg);
} else {
/* The output encoding is not known,
* so just write it out as-is.
*/
writer.write(c);
}
// one input char was processed
}
}
}
/**
* Receive notification of cdata.
*
* The Parser will call this method to report each chunk of
* character data. SAX parsers may return all contiguous character
* data in a single chunk, or they may split it into several
* chunks; however, all of the characters in any single event
* must come from the same external entity, so that the Locator
* provides useful information.
*
* The application must not attempt to read from the array
* outside of the specified range.
*
* Note that some parsers will report whitespace using the
* ignorableWhitespace() method rather than this one (validating
* parsers must do so).
*
* @param ch The characters from the XML document.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see #ignorableWhitespace
* @see org.xml.sax.Locator
*/
public void cdata(char ch[], int start, int length)
throws org.xml.sax.SAXException
{
try
{
writeNormalizedChars(ch, start, length, m_lineSepUse);
if (m_tracer != null)
super.fireCDATAEvent(ch, start, length);
}
catch(IOException ioe)
{
throw new SAXException(ioe);
}
}
/**
* Receive notification of ignorable whitespace in element content.
*
* Validating Parsers must use this method to report each chunk
* of ignorable whitespace (see the W3C XML 1.0 recommendation,
* section 2.10): non-validating parsers may also use this method
* if they are capable of parsing and using content models.
*
* SAX parsers may return all contiguous whitespace in a single
* chunk, or they may split it into several chunks; however, all of
* the characters in any single event must come from the same
* external entity, so that the Locator provides useful
* information.
*
* The application must not attempt to read from the array
* outside of the specified range.
*
* @param ch The characters from the XML document.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see #characters
*
* @throws org.xml.sax.SAXException
*/
public void ignorableWhitespace(char ch[], int start, int length)
throws org.xml.sax.SAXException
{
try
{
writeNormalizedChars(ch, start, length, m_lineSepUse);
}
catch(IOException ioe)
{
throw new SAXException(ioe);
}
}
/**
* Receive notification of a processing instruction.
*
* The Parser will invoke this method once for each processing
* instruction found: note that processing instructions may occur
* before or after the main document element.
*
* A SAX parser should never report an XML declaration (XML 1.0,
* section 2.8) or a text declaration (XML 1.0, section 4.3.1)
* using this method.
*
* @param target The processing instruction target.
* @param data The processing instruction data, or null if
* none was supplied.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
*/
public void processingInstruction(String target, String data)
throws org.xml.sax.SAXException
{
// flush anything pending first
flushPending();
if (m_tracer != null)
super.fireEscapingEvent(target, data);
}
/**
* Called when a Comment is to be constructed.
* Note that Xalan will normally invoke the other version of this method.
* %REVIEW% In fact, is this one ever needed, or was it a mistake?
*
* @param data The comment data.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*/
public void comment(String data) throws org.xml.sax.SAXException
{
final int length = data.length();
if (length > m_charsBuff.length)
{
m_charsBuff = new char[length*2 + 1];
}
data.getChars(0, length, m_charsBuff, 0);
comment(m_charsBuff, 0, length);
}
/**
* Report an XML comment anywhere in the document.
*
* This callback will be used for comments inside or outside the
* document element, including comments in the external DTD
* subset (if read).
*
* @param ch An array holding the characters in the comment.
* @param start The starting position in the array.
* @param length The number of characters to use from the array.
* @throws org.xml.sax.SAXException The application may raise an exception.
*/
public void comment(char ch[], int start, int length)
throws org.xml.sax.SAXException
{
flushPending();
if (m_tracer != null)
super.fireCommentEvent(ch, start, length);
}
/**
* Receive notivication of a entityReference.
*
* @param name non-null reference to the name of the entity.
*
* @throws org.xml.sax.SAXException
*/
public void entityReference(String name) throws org.xml.sax.SAXException
{
if (m_tracer != null)
super.fireEntityReference(name);
}
/**
* @see ExtendedContentHandler#addAttribute(String, String, String, String, String)
*/
public void addAttribute(
String uri,
String localName,
String rawName,
String type,
String value,
boolean XSLAttribute)
{
// do nothing, just forget all about the attribute
}
/**
* @see org.xml.sax.ext.LexicalHandler#endCDATA()
*/
public void endCDATA() throws SAXException
{
// do nothing
}
/**
* @see ExtendedContentHandler#endElement(String)
*/
public void endElement(String elemName) throws SAXException
{
if (m_tracer != null)
super.fireEndElem(elemName);
}
/**
* From XSLTC
*/
public void startElement(
String elementNamespaceURI,
String elementLocalName,
String elementName)
throws SAXException
{
if (m_needToCallStartDocument)
startDocumentInternal();
// time to fire off startlement event.
if (m_tracer != null) {
super.fireStartElem(elementName);
this.firePseudoAttributes();
}
return;
}
/**
* From XSLTC
*/
public void characters(String characters)
throws SAXException
{
final int length = characters.length();
if (length > m_charsBuff.length)
{
m_charsBuff = new char[length*2 + 1];
}
characters.getChars(0, length, m_charsBuff, 0);
characters(m_charsBuff, 0, length);
}
/**
* From XSLTC
*/
public void addAttribute(String name, String value)
{
// do nothing, forget about the attribute
}
/**
* Add a unique attribute
*/
public void addUniqueAttribute(String qName, String value, int flags)
throws SAXException
{
// do nothing, forget about the attribute
}
public boolean startPrefixMapping(
String prefix,
String uri,
boolean shouldFlush)
throws SAXException
{
// no namespace support for HTML
return false;
}
public void startPrefixMapping(String prefix, String uri)
throws org.xml.sax.SAXException
{
// no namespace support for HTML
}
public void namespaceAfterStartElement(
final String prefix,
final String uri)
throws SAXException
{
// no namespace support for HTML
}
public void flushPending() throws org.xml.sax.SAXException
{
if (m_needToCallStartDocument)
{
startDocumentInternal();
m_needToCallStartDocument = false;
}
}
}