/*

* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.ant.taskdefs;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.Task;

import org.apache.tools.ant.types.Reference;

import java.util.Iterator;

import java.util.Vector;

import com.nokia.ant.types.VariableSet;

import com.nokia.ant.types.Variable;

/**

 * To retrive a variable value from a collection of variable set based on name, which contains property-value in pair.

 *  

 * <pre>

 * Example:

 * 

 * <hlm:argSet id="test.variableSet">

 * <variable name="v1" value="the_value_1"/>

 *     <variable name="v2" value="the_value_2"/>

 *      <variable name="v3" value="the_value_3"/>

 * </hlm:argSet>

 *       

 *  <hlm:getVariableValue name="v3" property="v1.value">

 * <hlm:argSet refid="test.variableSet"/>

 * </hlm:getVariableValue>

 * </pre>

 * @ant.task name="getVariableValue"

 */

public class GetValueFromVariableSet extends Task {

    private String name;

    private String property;

    private Vector<VariableSet> variablesets = new Vector<VariableSet>();

    public void setName(String name) {

        this.name = name;

    }

    public void setProperty(String property) {

        this.property = property;

    }

    public void add(VariableSet vs) {

        variablesets.add(vs);

    }

    public VariableSet createVariableSet() {

        VariableSet vs = new VariableSet();

        variablesets.add(vs);

        return vs;

    }

    public void execute() {

        if (name == null)

            throw new BuildException("'name' attribute has not been defined.");

        if (property == null)

            throw new BuildException(

                    "'property' attribute has not been defined.");

        for (Iterator<VariableSet> vsit = variablesets.iterator(); vsit

                .hasNext();) {

            VariableSet vs = vsit.next();

            if (vs.isReference()) {

                Reference reference = vs.getRefid();

                vs = (VariableSet)reference.getReferencedObject(getProject());

            }

            for (Iterator vit = vs.getVariables().iterator(); vit.hasNext();) {

                Variable v = (Variable) vit.next();

                if (v.getName().equals(name)) {

                    log("Setting '" + property + "' property to '" + v.getValue() + "'");

                    getProject().setProperty(property, v.getValue());

                    return;

                }

            }

        }

        throw new BuildException("Could not find '" + name + "' variable.");

    }

}