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The Axiom API
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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.axiom.om;

import org.apache.axiom.soap.SOAPFactory;

public class OMAbstractFactory {
    public static final String OM_FACTORY_NAME_PROPERTY = "om.factory";
    public static final String SOAP11_FACTORY_NAME_PROPERTY = "soap11.factory";
    public static final String SOAP12_FACTORY_NAME_PROPERTY = "soap12.factory";

    private static final String DEFAULT_OM_FACTORY_CLASS_NAME =
            "org.apache.axiom.om.impl.llom.factory.OMLinkedListImplFactory";
    private static final String DEFAULT_SOAP11_FACTORY_CLASS_NAME =
            "org.apache.axiom.soap.impl.llom.soap11.SOAP11Factory";
    private static final String DEFAULT_SOAP12_FACTORY_CLASS_NAME =
            "org.apache.axiom.soap.impl.llom.soap12.SOAP12Factory";

    private static OMFactory defaultOMFactory = null;
    private static SOAPFactory defaultSOAP11OMFactory = null;
    private static SOAPFactory defaultSOAP12OMFactory = null;

    public static OMFactory getOMFactory() {
        if (defaultOMFactory != null) {
            return defaultOMFactory;
        }
        String omFactory;
        try {
            omFactory = System.getProperty(OM_FACTORY_NAME_PROPERTY);
            if (omFactory == null || "".equals(omFactory)) {
                omFactory = DEFAULT_OM_FACTORY_CLASS_NAME;
            }
        } catch (SecurityException e) {
            omFactory = DEFAULT_OM_FACTORY_CLASS_NAME;
        }

        try {
            defaultOMFactory = (OMFactory) Class.forName(omFactory).newInstance();
        } catch (InstantiationException e) {
            throw new OMException(e);
        } catch (IllegalAccessException e) {
            throw new OMException(e);
        } catch (ClassNotFoundException e) {
            throw new OMException(e);
        }
        return defaultOMFactory;
    }


    /**
     * Gets the default factory implementation from the classpath.
     *
     * @return Returns SOAPFactory.
     */
    public static SOAPFactory getSOAP11Factory() {
        if (defaultSOAP11OMFactory != null) {
            return defaultSOAP11OMFactory;
        }
        try {
            String omFactory = System.getProperty(SOAP11_FACTORY_NAME_PROPERTY);
            if (omFactory == null || "".equals(omFactory)) {
                omFactory = DEFAULT_SOAP11_FACTORY_CLASS_NAME;
            }
            defaultSOAP11OMFactory = (SOAPFactory) Class.forName(omFactory).newInstance();
        } catch (InstantiationException e) {
            throw new OMException(e);
        } catch (IllegalAccessException e) {
            throw new OMException(e);
        } catch (ClassNotFoundException e) {
            throw new OMException(e);
        }
        return defaultSOAP11OMFactory;
    }


    /**
     * Gets the default factory implementation from the classpath.
     *
     * @return Returns SOAPFactory.
     */
    public static SOAPFactory getSOAP12Factory() {
        if (defaultSOAP12OMFactory != null) {
            return defaultSOAP12OMFactory;
        }
        try {
            String omFactory = System.getProperty(SOAP12_FACTORY_NAME_PROPERTY);
            if (omFactory == null || "".equals(omFactory)) {
                omFactory = DEFAULT_SOAP12_FACTORY_CLASS_NAME;
            }
            defaultSOAP12OMFactory = (SOAPFactory) Class.forName(omFactory).newInstance();
        } catch (InstantiationException e) {
            throw new OMException(e);
        } catch (IllegalAccessException e) {
            throw new OMException(e);
        } catch (ClassNotFoundException e) {
            throw new OMException(e);
        }
        return defaultSOAP12OMFactory;
    }
}