org.apache.openjpa.lib.xml.XMLWriter 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.
*/
package org.apache.openjpa.lib.xml;
import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
/**
* The XMLWriter is a writer type for pretty-printing XML.
* It assumes that the streamed XML will be given without any whitespace,
* other than the space within text blocks.
*
* @author Abe White
*/
public class XMLWriter extends FilterWriter {
private static String _endl = J2DoPrivHelper.getLineSeparator();
private int _lastChar = ' ';
private int _lastChar2 = ' ';
private int _lastChar3 = ' ';
private int _depth = 0;
/**
* Construct an XMLWriter that will write to the given stream.
*/
public XMLWriter(Writer out) {
super(out);
}
public void write(char[] cbuf, int off, int len) throws IOException {
for (int i = 0; i < len; i++)
write(cbuf[off + i]);
}
public void write(String str, int off, int len) throws IOException {
for (int i = 0; i < len; i++)
write(str.charAt(off + i));
}
public void write(int c) throws IOException {
// the basic idea of this method is to make sure that when a tag
// or a text block starts, it is placed on a separate line and
// indented an amount appropriate to the XML tree depth
if (_lastChar == '<') {
// tag or processing instruction?
if (c != '?' && c != '!') {
// end tag; decrease depth before writing spaces
if (c == '/')
_depth--;
// tags are always on separate lines
out.write(_endl);
writeSpaces();
// beginning tag; increase depth for tag body
if (c != '/')
_depth++;
}
// if this is not a processing instruction / comment,
// write the chars
if (c != '!') {
out.write('<');
out.write(c);
}
} else if (c == '>') {
// if unary tag decrease depth to undo the increase at tag start
if (_lastChar == '/')
_depth--;
// check for the comment-processing conditions
if (_lastChar2 == '<' && _lastChar == '!')
out.write("');
} else if (c != '<') {
// if we're at "