/*
*  Copyright (c) WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. licenses this file to you 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 org.wso2.balana;

import org.w3c.dom.Node;

import java.util.HashMap;

/**
 * Factory that creates the AbstractTarget
 */
public class TargetFactory {

    private static volatile TargetFactory factoryInstance;

    /**
     * Returns AbstractTarget based one the XACML version
     *
     * @param node  DOM node
     * @param metaData policy meta data
     * @return  <code>AbstractTarget</code>
     * @throws ParsingException
     */
    public AbstractTarget getTarget(Node node, PolicyMetaData metaData) throws ParsingException {

        if(XACMLConstants.XACML_VERSION_3_0 == metaData.getXACMLVersion()){
            return org.wso2.balana.xacml3.Target.getInstance(node, metaData);
        } else {
            return org.wso2.balana.xacml2.Target.getInstance(node, metaData);
        }
    }

    /**
     * Returns an instance of this factory. This method enforces a singleton model, meaning that
     * this always returns the same instance, creating the factory if it hasn't been requested
     * before.
    *
     * @return the factory instance
     */
    public static TargetFactory getFactory() {
        if (factoryInstance == null) {
            synchronized (TargetFactory.class) {
                if (factoryInstance == null) {
                    factoryInstance = new TargetFactory();
                }
            }
        }

        return factoryInstance;
    }
}
