org.codehaus.plexus.util.xml.XmlUtil Maven / Gradle / Ivy
package org.codehaus.plexus.util.xml;
/*
* Copyright The Codehaus Foundation.
*
* Licensed 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.
*/
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.ReaderFactory;
import org.codehaus.plexus.util.StringUtils;
import org.codehaus.plexus.util.WriterFactory;
import org.codehaus.plexus.util.xml.pull.MXParser;
import org.codehaus.plexus.util.xml.pull.XmlPullParser;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
/**
* Common XML utilities methods.
*
* @author Vincent Siveton
* @version $Id$
* @since 1.5.7
*/
public class XmlUtil
{
/** The default line indenter size i.e. 2. */
public static final int DEFAULT_INDENTATION_SIZE = 2;
/** The default line separator ("\n" on UNIX) */
public static final String DEFAULT_LINE_SEPARATOR = System.getProperty( "line.separator" );
/**
* Determines if a given File shall be handled as XML.
*
* @param f not null file
* @return true if the given file has XML content, false otherwise.
*/
public static boolean isXml( File f )
{
if ( f == null )
{
throw new IllegalArgumentException( "f could not be null." );
}
if ( !f.isFile() )
{
throw new IllegalArgumentException( "The file '" + f.getAbsolutePath() + "' is not a file." );
}
Reader reader = null;
try
{
reader = ReaderFactory.newXmlReader( f );
XmlPullParser parser = new MXParser();
parser.setInput( reader );
parser.nextToken();
return true;
}
catch ( Exception e )
{
return false;
}
finally
{
IOUtil.close( reader );
}
}
/**
* Pretty format the input reader. For instance, the following input:
*
* <div><b>content</b></div>
*
* becomes
*
* <div>
* <b>content</b>
* </div>
*
*
* @param reader not null
* @param writer not null
* @throws IOException if any or invalid xml content
* @see #prettyFormat(Reader, Writer, int, String)
* @see ReaderFactory to read an xml content
* @see WriterFactory to write an xml content
*/
public static void prettyFormat( Reader reader, Writer writer )
throws IOException
{
prettyFormat( reader, writer, DEFAULT_INDENTATION_SIZE, DEFAULT_LINE_SEPARATOR );
}
/**
* Pretty format the input reader. For instance, the following input:
*
* <div><b>content</b></div>
*
* becomes
*
* <div>
* <b>content</b>
* </div>
*
*
* @param reader not null
* @param writer not null
* @param indentSize positive number for the indentation
* @param lineSeparator the wanted line separator
* @throws IOException if any or invalid xml content
* @see ReaderFactory to read an xml content
* @see WriterFactory to write an xml content
*/
public static void prettyFormat( Reader reader, Writer writer, int indentSize, String lineSeparator )
throws IOException
{
if ( reader == null )
{
throw new IllegalArgumentException( "The reader is null" );
}
if ( writer == null )
{
throw new IllegalArgumentException( "The writer is null" );
}
if ( indentSize < 0 )
{
indentSize = 0;
}
PrettyPrintXMLWriter xmlWriter = new PrettyPrintXMLWriter( writer );
xmlWriter.setLineIndenter( StringUtils.repeat( " ", indentSize ) );
xmlWriter.setLineSeparator( lineSeparator );
XmlPullParser parser = new MXParser();
try
{
parser.setInput( reader );
prettyFormatInternal( parser, xmlWriter );
}
catch ( XmlPullParserException e )
{
throw new IOException( "Unable to parse the XML: " + e.getMessage() );
}
}
/**
* Pretty format the input stream. For instance, the following input:
*
* <div><b>content</b></div>
*
* becomes
*
* <div>
* <b>content</b>
* </div>
*
*
* @param is not null
* @param os not null
* @throws IOException if any or invalid xml content
* @see #prettyFormat(InputStream, OutputStream, int, String)
*/
public static void prettyFormat( InputStream is, OutputStream os )
throws IOException
{
prettyFormat( is, os, DEFAULT_INDENTATION_SIZE, DEFAULT_LINE_SEPARATOR );
}
/**
* Pretty format the input stream. For instance, the following input:
*
* <div><b>content</b></div>
*
* becomes
*
* <div>
* <b>content</b>
* </div>
*
*
* @param is not null
* @param os not null
* @param indentSize positive number for the indentation
* @param lineSeparator the wanted line separator
* @throws IOException if any or invalid xml content
*/
public static void prettyFormat( InputStream is, OutputStream os, int indentSize, String lineSeparator )
throws IOException
{
if ( is == null )
{
throw new IllegalArgumentException( "The is is null" );
}
if ( os == null )
{
throw new IllegalArgumentException( "The os is null" );
}
if ( indentSize < 0 )
{
indentSize = 0;
}
Reader reader = null;
Writer out = new OutputStreamWriter( os );
PrettyPrintXMLWriter xmlWriter = new PrettyPrintXMLWriter( out );
xmlWriter.setLineIndenter( StringUtils.repeat( " ", indentSize ) );
xmlWriter.setLineSeparator( lineSeparator );
XmlPullParser parser = new MXParser();
try
{
reader = ReaderFactory.newXmlReader( is );
parser.setInput( reader );
prettyFormatInternal( parser, xmlWriter );
}
catch ( XmlPullParserException e )
{
throw new IOException( "Unable to parse the XML: " + e.getMessage() );
}
finally
{
IOUtil.close( reader );
IOUtil.close( out );
}
}
/**
* @param parser not null
* @param writer not null
* @throws XmlPullParserException if any
* @throws IOException if any
*/
private static void prettyFormatInternal( XmlPullParser parser, PrettyPrintXMLWriter writer )
throws XmlPullParserException, IOException
{
boolean hasTag = false;
boolean hasComment = false;
int eventType = parser.getEventType();
while ( eventType != XmlPullParser.END_DOCUMENT )
{
if ( eventType == XmlPullParser.START_TAG )
{
hasTag = true;
if ( hasComment )
{
writer.writeText( writer.getLineIndenter() );
hasComment = false;
}
writer.startElement( parser.getName() );
for ( int i = 0; i < parser.getAttributeCount(); i++ )
{
String key = parser.getAttributeName( i );
String value = parser.getAttributeValue( i );
writer.addAttribute( key, value );
}
}
else if ( eventType == XmlPullParser.TEXT )
{
String text = parser.getText();
if ( !text.trim().equals( "" ) )
{
text = StringUtils.removeDuplicateWhitespace( text );
writer.writeText( text );
}
}
else if ( eventType == XmlPullParser.END_TAG )
{
hasTag = false;
writer.endElement();
}
else if ( eventType == XmlPullParser.COMMENT )
{
hasComment = true;
if ( !hasTag )
{
writer.writeMarkup( writer.getLineSeparator() );
for ( int i = 0; i < writer.getDepth(); i++ )
{
writer.writeMarkup( writer.getLineIndenter() );
}
}
writer.writeMarkup( "" );
if ( !hasTag )
{
writer.writeMarkup( writer.getLineSeparator() );
for ( int i = 0; i < writer.getDepth() - 1; i++ )
{
writer.writeMarkup( writer.getLineIndenter() );
}
}
}
else if ( eventType == XmlPullParser.DOCDECL )
{
writer.writeMarkup( "" );
writer.endOfLine();
}
else if ( eventType == XmlPullParser.PROCESSING_INSTRUCTION )
{
writer.writeMarkup( "" );
writer.endOfLine();
}
else if ( eventType == XmlPullParser.CDSECT )
{
writer.writeMarkup( "" );
}
else if ( eventType == XmlPullParser.ENTITY_REF )
{
writer.writeMarkup( "&" + parser.getName() + ";" );
}
eventType = parser.nextToken();
}
}
}
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