org.jboss.maven.shared.properties.CompositeMavenProjectProperties Maven / Gradle / Ivy

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/*
 * jDocBook, processing of DocBook sources as a Maven plugin
 *
 * Copyright (c) 2009, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */

package org.jboss.maven.shared.properties;

import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.io.File;

import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;

/**
 * Presents an consolidated, aggregated view of project properties.
 * 
 * Aggregation occurs across {@link System#getProperties()},
 * {@link org.apache.maven.project.MavenProject#getProperties()} and via
 * bean-properties-style reflection on
 * {@link org.apache.maven.project.MavenProject}.
 *
 * @author Steve Ebersole
 */
public class CompositeMavenProjectProperties extends AbstractMap {
	private final MavenProject project;
	private final Map values;

	public CompositeMavenProjectProperties(MavenProject project) {
		this.project = project;
		values = new HashMap(System.getProperties());
		values.putAll(project.getProperties());
		for (Object o : project.getBuild().getFilters()) {
			String filtersFile = (String) o;
			values.putAll(PropertiesHelper.loadPropertyFile(new File(filtersFile)));
		}
	}

	public synchronized Object get(Object key) {
		// try the local value map first...
		Object value = values.get(key);

		// then try reflection on the project bean properties...
		if (value == null) {
			try {
				value = ReflectionValueExtractor.evaluate(String.valueOf(key), project);
			} catch (Throwable ignore) {
				// intentionally empty...
			}
		}
		return value;
	}

	@Override
	public Set> entrySet() {
		throw new UnsupportedOperationException("iterating MavenProject properties is not supported");
	}
}