AndCondition.java

/*
 * IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
 *
 * http://izpack.org/
 * http://izpack.codehaus.org/
 *
 * Copyright 2007 Dennis Reil
 *
 * Licensed 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 com.izforge.izpack.rules;

import com.izforge.izpack.util.Debug;
import com.izforge.izpack.adaptator.IXMLElement;

/**
 * Defines a condition where both operands have to be true
 *
 * @author Dennis Reil, <Dennis.Reil@reddot.de>
 */
public class AndCondition extends Condition
{

    /**
     *
     */
    private static final long serialVersionUID = -5854944262991488370L;

    protected Condition leftoperand;

    protected Condition rightoperand;

    /**
     *
     */
    public AndCondition()
    {
        super();
    }

    /**
     *
     */
    public AndCondition(Condition operand1, Condition operand2)
    {
        this.leftoperand = operand1;
        this.rightoperand = operand2;
    }


    /*
    * (non-Javadoc)
    *
    * @see de.reddot.installer.rules.Condition#readFromXML(com.izforge.izpack.adaptator.IXMLElement)
    */
    public void readFromXML(IXMLElement xmlcondition)
    {
        try
        {
            if (xmlcondition.getChildrenCount() != 2)
            {
                Debug.log("and-condition needs two conditions as operands");
                return;
            }
            this.leftoperand = RulesEngine.analyzeCondition(xmlcondition.getChildAtIndex(0));
            this.rightoperand = RulesEngine.analyzeCondition(xmlcondition.getChildAtIndex(1));
        }
        catch (Exception e)
        {
            Debug.log("missing element in and-condition");
        }
    }


    public boolean isTrue()
    {
        return leftoperand.isTrue() && rightoperand.isTrue();
    }

    /* (non-Javadoc)
     * @see com.izforge.izpack.rules.Condition#getDependenciesDetails()
     */
    public String getDependenciesDetails()
    {
        StringBuffer details = new StringBuffer();
        details.append(this.id);
        details.append(" depends on:<ul><li>");
        details.append(leftoperand.getDependenciesDetails());
        details.append("</li> AND <li>");
        details.append(rightoperand.getDependenciesDetails());
        details.append("</li></ul>");
        return details.toString();
    }
}