org.apache.geronimo.system.configuration.Printer Maven / Gradle / Ivy
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/**
* 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.
*/
/*
* This code has been borrowed from the Apache Xerces project. We're copying the code to
* keep from adding a dependency on Xerces in the Geronimo kernel.
*/
package org.apache.geronimo.system.configuration;
import java.io.Writer;
import java.io.StringWriter;
import java.io.IOException;
/**
* The printer is responsible for sending text to the output stream
* or writer. This class performs direct writing for efficiency.
* {@link IndentPrinter} supports indentation and line wrapping by
* extending this class.
*
* @version $Revision: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
* @author Assaf Arkin
*/
public class Printer
{
/**
* The output format associated with this serializer. This will never
* be a null reference. If no format was passed to the constructor,
* the default one for this document type will be used. The format
* object is never changed by the serializer.
*/
protected final OutputFormat format;
/**
* The writer to which the document is written.
*/
protected Writer writer;
/**
* The DTD writer. When we switch to DTD mode, all output is
* accumulated in this DTD writer. When we switch out of it,
* the output is obtained as a string. Must not be reset to
* null until we're done with the document.
*/
protected StringWriter dtdWriter;
/**
* Holds a reference to the document writer while we are
* in DTD mode.
*/
protected Writer docWriter;
/**
* Holds the exception thrown by the serializer. Exceptions do not cause
* the serializer to quit, but are held and one is thrown at the end.
*/
protected IOException exception;
/**
* The size of the output buffer.
*/
private static final int BufferSize = 4096;
/**
* Output buffer.
*/
private final char[] buffer = new char[ BufferSize ];
/**
* Position within the output buffer.
*/
private int pos = 0;
public Printer( Writer writer, OutputFormat format)
{
this.writer = writer;
this.format = format;
exception = null;
dtdWriter = null;
docWriter = null;
pos = 0;
}
public IOException getException()
{
return exception;
}
/**
* Called by any of the DTD handlers to enter DTD mode.
* Once entered, all output will be accumulated in a string
* that can be printed as part of the document's DTD.
* This method may be called any number of time but will only
* have affect the first time it's called. To exist DTD state
* and get the accumulated DTD, call {@link #leaveDTD}.
*/
public void enterDTD()
throws IOException
{
// Can only enter DTD state once. Once we're out of DTD
// state, can no longer re-enter it.
if ( dtdWriter == null ) {
flushLine( false );
dtdWriter = new StringWriter();
docWriter = writer;
writer = dtdWriter;
}
}
/**
* Called by the root element to leave DTD mode and if any
* DTD parts were printer, will return a string with their
* textual content.
*/
public String leaveDTD()
throws IOException
{
// Only works if we're going out of DTD mode.
if ( writer == dtdWriter ) {
flushLine( false );
writer = docWriter;
return dtdWriter.toString();
} else
return null;
}
public void printText( String text )
throws IOException
{
try {
int length = text.length();
for ( int i = 0 ; i < length ; ++i ) {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = text.charAt( i );
++pos;
}
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void printText( StringBuffer text )
throws IOException
{
try {
int length = text.length();
for ( int i = 0 ; i < length ; ++i ) {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = text.charAt( i );
++pos;
}
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void printText( char[] chars, int start, int length )
throws IOException
{
try {
while ( length-- > 0 ) {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = chars[ start ];
++start;
++pos;
}
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void printText( char ch )
throws IOException
{
try {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = ch;
++pos;
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void printSpace()
throws IOException
{
try {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = ' ';
++pos;
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void breakLine()
throws IOException
{
try {
if ( pos == BufferSize ) {
writer.write( buffer );
pos = 0;
}
buffer[ pos ] = '\n';
++pos;
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
}
public void breakLine( boolean preserveSpace )
throws IOException
{
breakLine();
}
public void flushLine( boolean preserveSpace )
throws IOException
{
// Write anything left in the buffer into the writer.
try {
writer.write( buffer, 0, pos );
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
}
pos = 0;
}
/**
* Flush the output stream. Must be called when done printing
* the document, otherwise some text might be buffered.
*/
public void flush()
throws IOException
{
try {
writer.write( buffer, 0, pos );
writer.flush();
} catch ( IOException except ) {
// We don't throw an exception, but hold it
// until the end of the document.
if ( exception == null )
exception = except;
throw except;
}
pos = 0;
}
public void indent()
{
// NOOP
}
public void unindent()
{
// NOOP
}
public int getNextIndent()
{
return 0;
}
public void setNextIndent( int indent )
{
}
public void setThisIndent( int indent )
{
}
}
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