com.google.code.configprocessor.maven.AntrunXmlPlexusConfigurationWriter 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.
 */
package com.google.code.configprocessor.maven;

import org.codehaus.plexus.configuration.PlexusConfiguration;
import org.codehaus.plexus.util.xml.PrettyPrintXMLWriter;
import org.codehaus.plexus.util.xml.XMLWriter;

import java.io.IOException;
import java.io.Writer;

/**
 * Write a plexus configuration to a stream
 * Have to use an XML writer because in Maven 2.x the PlexusConfig toString() method loses XML
 * attributes
 * Note: This class was originally copied from antrun-plugin. It is duplicated here
 * to maintain compatibility with both Maven 2.x and Maven 3.x.
 */
public class AntrunXmlPlexusConfigurationWriter {

	public void write(PlexusConfiguration configuration, Writer writer) throws IOException {
		int depth = 0;

		PrettyPrintXMLWriter xmlWriter = new PrettyPrintXMLWriter(writer);
		write(configuration, xmlWriter, depth);
	}

	private void write(PlexusConfiguration c, XMLWriter w, int depth) throws IOException {
		int count = c.getChildCount();

		if (count == 0) {
			writeTag(c, w);
		} else {
			w.startElement(c.getName());
			writeAttributes(c, w);

			for (int i = 0; i < count; i++) {
				PlexusConfiguration child = c.getChild(i);

				write(child, w, depth + 1);
			}

			w.endElement();
		}
	}

	private void writeTag(PlexusConfiguration c, XMLWriter w) throws IOException {
		w.startElement(c.getName());

		writeAttributes(c, w);

		String value = c.getValue(null);
		if (value != null) {
			w.writeText(value);
		}

		w.endElement();
	}

	private void writeAttributes(PlexusConfiguration c, XMLWriter w) throws IOException {
		String[] names = c.getAttributeNames();

		for (int i = 0; i < names.length; i++) {
			w.addAttribute(names[i], c.getAttribute(names[i], null));
		}
	}
}