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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.
*/
// Sep 14, 2000:
// Fixed serializer to report IO exception directly, instead at
// the end of document processing.
// Reported by Patrick Higgins
package org.apache.jackrabbit.vault.util.xml.serialize;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
/**
* 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.
*
* @author Assaf Arkin
* @version $Revision$ $Date$
*/
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) {
_writer = writer;
_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;
}
String line = _format.getLineSeparator();
char[] chL = line.toCharArray();
for (int i = 0; i < chL.length; i++) {
_buffer[_pos++] = chL[i];
}
//_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) {
}
}
