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/*--
Copyright (C) 2000-2012 Jason Hunter & Brett McLaughlin.
All rights reserved.
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from the JDOM Project Management .
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"This product includes software developed by the
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This software consists of voluntary contributions made by many
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created by Jason Hunter and
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* The StAXStreamReader can manage many styles of document formatting, from
* untouched to 'pretty' printed. The default is to output the document content
* exactly as created, but this can be changed by setting a new Format object:
*
* - For pretty-print output, use
*
{@link Format#getPrettyFormat()}.
* - For whitespace-normalised output, use
*
{@link Format#getCompactFormat()}.
* - For unmodified-format output, use
*
{@link Format#getRawFormat()}.
*
*
* There is only one {@link #output output(Document)} method that exposes
* a JDOM Document as a StAX Stream.
*
* If changing the {@link Format} settings are insufficient for your output
* needs you can customise this StAXStreamReader further by setting a different
* {@link StAXStreamReaderProcessor} with the
* {@link #setStAXAsStreamProcessor(StAXStreamReaderProcessor)} method or an appropriate
* constructor. A fully-enabled Abstract class
* {@link AbstractStAXStreamReaderProcessor} is available to be further extended to
* your needs if all you want to do is tweak some details.
*
* @author Rolf Lear
* @since JDOM 2.1.0
*/
public final class StAXStreamReader implements Cloneable {
/*
* =====================================================================
* Static content.
* =====================================================================
*/
/**
* Create a final and static instance of the StAXStreamReaderProcessor The
* final part is important because it improves performance.
*
* The JDOM user can change the actual XMLOutputProcessor with the
* {@link StAXStreamReader#setStAXAsStreamProcessor(StAXStreamReaderProcessor)} method.
*
* @author rolf
*/
private static final class DefaultStAXAsStreamProcessor extends AbstractStAXStreamReaderProcessor {
// do nothing different
}
/**
* This constant XMLOutputProcessor is used for all non-customised
* XMLOutputters
*/
private static final DefaultStAXAsStreamProcessor DEFAULTPROCESSOR =
new DefaultStAXAsStreamProcessor();
/*
* =====================================================================
* Instance content.
* =====================================================================
*/
// For normal output
private Format myFormat = null;
// The actual XMLOutputProcessor to delegate to.
private StAXStreamReaderProcessor myProcessor = null;
/*
* =====================================================================
* Constructors
* =====================================================================
*/
/**
* This will create an XMLOutputter with the specified format
* characteristics.
*
* Note: the format object is cloned internally before use. If you
* want to modify the Format after constructing the XMLOutputter you can
* modify the Format instance {@link #getFormat()} returns.
*
* @param format
* The Format instance to use. This instance will be cloned() and as
* a consequence, changes made to the specified format instance
* will not be reflected in this XMLOutputter. A null input
* format indicates that XMLOutputter should use the default
* {@link Format#getRawFormat()}
* @param processor
* The XMLOutputProcessor to delegate output to. If null the
* XMLOutputter will use the default XMLOutputProcessor.
*/
public StAXStreamReader(Format format, StAXStreamReaderProcessor processor) {
myFormat = format == null ? Format.getRawFormat() : format.clone();
myProcessor = processor == null ? DEFAULTPROCESSOR : processor;
}
/**
* This will create an XMLOutputter with a default
* {@link Format} and {@link StAXStreamReaderProcessor}.
*/
public StAXStreamReader() {
this(null, null);
}
/**
* This will create an XMLOutputter with the same
* customisations set in the given XMLOutputter instance. Note
* that XMLOutputter two = one.clone(); would work equally
* well.
*
* @param that
* the XMLOutputter to clone
*/
public StAXStreamReader(StAXStreamReader that) {
this(that.myFormat, null);
}
/**
* This will create an XMLOutputter with the specified format
* characteristics.
*
* Note: the format object is cloned internally before use.
*
* @param format
* The Format instance to use. This instance will be cloned() and as
* a consequence, changes made to the specified format instance
* will not be reflected in this XMLOutputter. A null input
* format indicates that XMLOutputter should use the default
* {@link Format#getRawFormat()}
*/
public StAXStreamReader(Format format) {
this(format, null);
}
/**
* This will create an XMLOutputter with the specified
* XMLOutputProcessor.
*
* @param processor
* The XMLOutputProcessor to delegate output to. If null the
* XMLOutputter will use the default XMLOutputProcessor.
*/
public StAXStreamReader(StAXStreamReaderProcessor processor) {
this(null, processor);
}
/*
* =======================================================================
* API - Settings...
* =======================================================================
*/
/**
* Sets the new format logic for the XMLOutputter. Note the Format object is
* cloned internally before use.
*
* @see #getFormat()
* @param newFormat
* the format to use for subsequent output
*/
public void setFormat(Format newFormat) {
this.myFormat = newFormat.clone();
}
/**
* Returns the current format in use by the XMLOutputter. Note the Format
* object returned is not a clone of the one used internally, thus,
* an XMLOutputter instance is able to have its Format changed by changing
* the settings on the Format instance returned by this method.
*
* @return the current Format instance used by this XMLOutputter.
*/
public Format getFormat() {
return myFormat;
}
/**
* Returns the current XMLOutputProcessor instance in use by the
* StAXStreamReader.
*
* @return the current XMLOutputProcessor instance.
*/
public StAXStreamReaderProcessor getStAXAsStreamProcessor() {
return myProcessor;
}
/**
* Sets a new StAXStreamReaderProcessor instance for this StAXStreamReader. Note the
* processor object is expected to be thread-safe.
*
* @param processor
* the new XMLOutputProcesor to use for output
*/
public void setStAXAsStreamProcessor(StAXStreamReaderProcessor processor) {
this.myProcessor = processor;
}
/*
* =======================================================================
* API - Output to STREAM Methods ... All methods defer to the WRITER
* equivalents
* =======================================================================
*/
/**
* This will expose the {@link Document} as a StAX XMLStreamReader.
*
* @param doc
* Document to format.
* @return The XMLStreamReader representing the input Document.
* @throws NullPointerException
* if the specified content is null.
*/
public final XMLStreamReader output(Document doc) {
return myProcessor.buildReader(doc, myFormat.clone());
}
/*
* ========================================================================
* Basic Support methods.
* ========================================================================
*/
/**
* Returns a cloned copy of this XMLOutputter.
*/
@Override
public StAXStreamReader clone() {
// Implementation notes: Since all state of an XMLOutputter is
// embodied in simple private instance variables, Object.clone
// can be used. Note that since Object.clone is totally
// broken, we must catch an exception that will never be
// thrown.
try {
return (StAXStreamReader) super.clone();
} catch (java.lang.CloneNotSupportedException e) {
// even though this should never ever happen, it's still
// possible to fool Java into throwing a
// CloneNotSupportedException. If that happens, we
// shouldn't swallow it.
throw new RuntimeException("Unexpected CloneNotSupportedException", e);
}
}
/**
* Return a string listing of the settings for this XMLOutputter instance.
*
* @return a string listing the settings for this XMLOutputter instance
*/
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("StAXStreamReader[omitDeclaration = ");
buffer.append(myFormat.omitDeclaration);
buffer.append(", ");
buffer.append("encoding = ");
buffer.append(myFormat.encoding);
buffer.append(", ");
buffer.append("omitEncoding = ");
buffer.append(myFormat.omitEncoding);
buffer.append(", ");
buffer.append("indent = '");
buffer.append(myFormat.indent);
buffer.append("'");
buffer.append(", ");
buffer.append("expandEmptyElements = ");
buffer.append(myFormat.expandEmptyElements);
buffer.append(", ");
buffer.append("lineSeparator = '");
for (char ch : myFormat.lineSeparator.toCharArray()) {
switch (ch) {
case '\r':
buffer.append("\\r");
break;
case '\n':
buffer.append("\\n");
break;
case '\t':
buffer.append("\\t");
break;
default:
buffer.append("[" + ((int) ch) + "]");
break;
}
}
buffer.append("', ");
buffer.append("textMode = ");
buffer.append(myFormat.mode + "]");
return buffer.toString();
}
}