org.apache.catalina.util.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.catalina.util;
import java.io.IOException;
import java.io.Writer;
import org.apache.tomcat.util.security.Escape;
/**
* XMLWriter helper class.
*/
public class XMLWriter {
// -------------------------------------------------------------- Constants
/**
* Opening tag.
*/
public static final int OPENING = 0;
/**
* Closing tag.
*/
public static final int CLOSING = 1;
/**
* Element with no content.
*/
public static final int NO_CONTENT = 2;
// ----------------------------------------------------- Instance Variables
/**
* Buffer.
*/
protected StringBuilder buffer = new StringBuilder();
/**
* Writer.
*/
protected final Writer writer;
protected boolean lastWriteWasOpen;
// ----------------------------------------------------------- Constructors
/**
* New XML writer utility that will store its data in an internal buffer.
*/
public XMLWriter() {
this(null);
}
/**
* New XML writer utility that will store its data in an internal buffer
* and can write it to the specified writer.
*
* See {@link #sendData()}
*
* @param writer The writer to use
*/
public XMLWriter(Writer writer) {
this.writer = writer;
}
// --------------------------------------------------------- Public Methods
/**
* Retrieve generated XML.
*
* @return String containing the generated XML
*/
@Override
public String toString() {
return buffer.toString();
}
/**
* Write property to the XML.
*
* @param namespace Namespace
* @param name Property name
* @param value Property value
*/
public void writeProperty(String namespace, String name, String value) {
writeElement(namespace, name, OPENING);
buffer.append(value);
writeElement(namespace, name, CLOSING);
}
/**
* Write an element.
*
* @param name Element name
* @param namespace Namespace abbreviation
* @param type Element type
*/
public void writeElement(String namespace, String name, int type) {
writeElement(namespace, null, name, type);
}
/**
* Write an element.
*
* @param namespace Namespace abbreviation
* @param namespaceInfo Namespace info
* @param name Element name
* @param type Element type
*/
public void writeElement(String namespace, String namespaceInfo,
String name, int type) {
if ((namespace != null) && (namespace.length() > 0)) {
switch (type) {
case OPENING:
if (lastWriteWasOpen) {
buffer.append('\n');
}
if (namespaceInfo != null) {
buffer.append("<" + namespace + ":" + name + " xmlns:"
+ namespace + "=\""
+ namespaceInfo + "\">");
} else {
buffer.append("<" + namespace + ":" + name + ">");
}
lastWriteWasOpen = true;
break;
case CLOSING:
buffer.append("\n");
lastWriteWasOpen = false;
break;
case NO_CONTENT:
default:
if (lastWriteWasOpen) {
buffer.append('\n');
}
if (namespaceInfo != null) {
buffer.append("<" + namespace + ":" + name + " xmlns:"
+ namespace + "=\""
+ namespaceInfo + "\"/>\n");
} else {
buffer.append("<" + namespace + ":" + name + "/>\n");
}
lastWriteWasOpen = false;
break;
}
} else {
switch (type) {
case OPENING:
if (lastWriteWasOpen) {
buffer.append('\n');
}
buffer.append("<" + name + ">");
lastWriteWasOpen = true;
break;
case CLOSING:
buffer.append("\n");
lastWriteWasOpen = false;
break;
case NO_CONTENT:
default:
if (lastWriteWasOpen) {
buffer.append('\n');
}
buffer.append("<" + name + "/>\n");
lastWriteWasOpen = false;
break;
}
}
}
/**
* Write text.
*
* @param text Text to append
*/
public void writeText(String text) {
buffer.append(Escape.xml(text));
}
/**
* Write raw XML data.
*
* @param raw Raw XML to append
*/
public void writeRaw(String raw) {
buffer.append(raw);
}
/**
* Write data.
*
* @param data Data to append
*/
public void writeData(String data) {
buffer.append("");
}
/**
* Write XML Header.
*/
public void writeXMLHeader() {
buffer.append("\n");
}
/**
* Send data and reinitializes buffer, if a writer has been specified.
* @throws IOException Error writing XML data
*/
public void sendData()
throws IOException {
if (writer != null) {
writer.write(buffer.toString());
buffer = new StringBuilder();
}
}
}