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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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.apache.cxf.ws.addressing;


import java.util.logging.Level;
import java.util.logging.Logger;


import org.apache.cxf.common.classloader.ClassLoaderUtils;
import org.apache.cxf.common.logging.LogUtils;
import static org.apache.cxf.ws.addressing.JAXWSAConstants.DEFAULT_ADDRESSING_BUILDER;


/**
 * Factory for WS-Addressing elements.
 * 
 * Note that the JAXB generated types are used directly to represent 
 * WS-Addressing schema types. Hence there are no factory methods defined
 * on this class for those types, as they may be instanted in the normal
 * way via the JAXB generated ObjectFactory.
 */
public abstract class AddressingBuilder implements AddressingType {

    private static final Logger LOG = 
        LogUtils.getL7dLogger(AddressingBuilder.class);
    private static AddressingBuilder builder;

    /**
     * Non-public constructor prevents instantiation.
     */
    protected AddressingBuilder() {
    }

    /**
     * AddressingBuilder factory method.
     *
     * @return AddressingBuilder instance 
     */
    public static AddressingBuilder getAddressingBuilder() { 
        synchronized (AddressingBuilder.class) {
            if (builder == null) {
                String className = DEFAULT_ADDRESSING_BUILDER;
                try {
                    Class cls = ClassLoaderUtils.loadClass(className, AddressingBuilder.class);
                    builder = (AddressingBuilder)cls.newInstance();
                } catch (ClassNotFoundException cnfe) {
                    cnfe.printStackTrace();
                    LogUtils.log(LOG,
                                 Level.WARNING, 
                                 "BUILDER_CLASS_NOT_FOUND_MSG", 
                                 cnfe,
                                 className);
                } catch (Exception ex) {
                    ex.printStackTrace();
                    LogUtils.log(LOG,
                                 Level.WARNING,
                                 "BUILDER_INSTANTIATION_FAILED_MSG",
                                 ex,
                                 className);
                }
            }
        }
        return builder;
    }
    
    /**
     * AddressingProperties factory method.
     *  
     * @return a new AddressingProperties instance
     */
    public abstract AddressingProperties newAddressingProperties();
    
    /**
     * Returns an instance of
     * javax.ws.addressing.AddressingConstants
     * 
     * Note: This is a new method since Early Draft 1.
     * 
     * @return The new AddressingConstants.
     */
    public abstract AddressingConstants newAddressingConstants();
}