/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer. 
 * 
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution. 
 * 
 * - Neither the name of the KNOPFLERFISH project nor the names of its 
 *   contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.ant.taskdefs.bundle;

import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Manifest;
import org.apache.tools.ant.taskdefs.ManifestTask;
import org.apache.tools.ant.taskdefs.ManifestException;


/**
 * Adaption of std Manifest task which ignores attributes
 * with special empty values.
 *
 * <p>
 * Any attrubute with the value
 * <pre>
 * [bundle.emptystring]
 * </pre>
 * will <b>not</b> be stored in the manifest at all.
 * </p>
 */
public class BundleManifestTask extends ManifestTask {
  public BundleManifestTask() {
    super();
   }

  /**
   * Override <tt>ManifestTask.addConfiguredAttribute</tt> with
   * version which checks if the attribute should be stored.
   */
  public void addConfiguredAttribute(Manifest.Attribute attribute)
    throws ManifestException {
    if("[bundle.emptystring]".equals(attribute.getValue())) {
      return;
    }
    super.addConfiguredAttribute(attribute);
  }
  
}
