sigil/bld-ivy/src/org/cauldron/bld/ant/BundleInfoTask.java

/*
 * 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.cauldron.bld.ant;

import java.io.File;
import java.io.IOException;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;

public class BundleInfoTask extends Task {
	private File bundle;
	private String header;
	private String property;
	private String defaultValue;
	
	@Override
	public void execute() throws BuildException {
		if (bundle == null)
			throw new BuildException("missing attribute: bundle");
		if (header == null)
			throw new BuildException("missing attribute: header");
		
		try {
			JarFile jar = new JarFile(bundle);
			Manifest mf = jar.getManifest();
			String value = mf.getMainAttributes().getValue(header);
			if ( property == null ) {
				log(header + "=" + value);
			}
			else {
			    if ("Bundle-SymbolicName".equals(header) && value != null) {
			        // remove singleton flag
			        int semi = value.indexOf(';');
			        if (semi > 0)
			            value = value.substring(0, semi);
			    }
				if ( value == null ) {
					value = defaultValue;
				}
				if ( value != null ) {
					getProject().setNewProperty(property, value);
				}
			}
		} catch (IOException e) {
			throw new BuildException( "Failed to access bundle", e);
		}
	}
	
	public void setBundle(String bundle) {
		this.bundle = new File( bundle );
	}
	
	public void setHeader(String header) {
		this.header = header;
	}
	
	public void setProperty(String property) {
		this.property = property;
	}
	
	public void setDefaultValue(String defaultValue) {
		this.defaultValue = defaultValue;
	}
}