/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 * any, must include the following acknowlegement:
 * "This product includes software developed by the
 * Apache Software Foundation (http://www.apache.org/)."
 * Alternately, this acknowlegement may appear in the software itself,
 * if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 * Foundation" must not be used to endorse or promote products derived
 * from this software without prior written permission. For written
 * permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 * nor may "Apache" appear in their names without prior written
 * permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant.taskdefs;

import java.util.Vector;
import java.util.Enumeration;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;

/**
 * read in all tasks in the current environment, save them as properties
 * beginning with "environment." No case change is made (so that unix can
 * have properties differing only by case) This does not work on the Mac
 * until someone fixes Execute.java appropriately.
 * To test the task works, run it in debug mode and watch the assignments.
  * @author slo
 * @created March 16, 2001
 */

public class Getenv extends Task {

	/**
	 * what is the prefix to use?
	 */
	protected String prefix = "environment.";


	/**
	 * Sets the Prefix used when building new environment names
	 *
	 * @param prefix The new Prefix value
	 */
	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}


	/**
	 * Gets the Prefix attribute of the Getenv object
	 *
	 * @return The Prefix value
	 */
	public String getPrefix() {
		return prefix;
	}


	/**
	 * Does the work.
	 *
	 * @exception BuildException Thrown in unrecoverable error.
	 */
	public void execute()
		throws BuildException {
		//get all the variables
		Vector env = Execute.getProcEnvironment();
		//then set them one by one
		Enumeration elements = env.elements();
		while (elements.hasMoreElements()) {
			String entry = (String)elements.nextElement();

			//crack this into 'word'='value'.
			//Regexp as standard would be handy here, but we can work something out
			int equalsAt = entry.indexOf('=');
			//assume that it was found or we have a very broken notion of
			//what an environment variable is on this box
			String key = prefix+entry.substring(0, equalsAt);
			String value = entry.substring(equalsAt + 1);
			project.setProperty(key,value);
		}
	}
}