/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 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.types;

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

/**
 * Wrapper for environment variables.
 *
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
 */
public class Environment {

    protected Vector variables;

    public static class Variable {
        private String key, value;

        public Variable() {
            super();
        }

        public void setKey(String key) {
            this.key = key;
        }
        
        public void setValue(String value) {
            this.value = value;
        }
        
        public String getKey() {
            return this.key;
        }
        
        public String getValue() {
            return this.value;
        }
        
        public void setPath(Path path) {
            this.value = path.toString();
        }

        public void setFile(java.io.File file) {
            this.value = file.getAbsolutePath();
        }

        public String getContent() throws BuildException {
            if (key == null || value == null) {
                throw new BuildException("key and value must be specified for environment variables.");
            }
            StringBuffer sb = new StringBuffer(key.trim());
            sb.append("=").append(value.trim());
            return sb.toString();
        }
    }

    public Environment() {
        variables = new Vector();
    }

    public void addVariable(Variable var) {
        variables.addElement(var);
    }

    public String[] getVariables() throws BuildException {
        if (variables.size() == 0) {
            return null;
        }
        String[] result = new String[variables.size()];
        for (int i=0; i<result.length; i++) {
            result[i] = ((Variable) variables.elementAt(i)).getContent();
        }
        return result;
    }
}