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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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.opensaml.security;

import org.opensaml.saml2.metadata.provider.MetadataProvider;
import org.opensaml.xml.util.AbstractWrappedSingletonFactory;

/**
 * Singleton factory for producing instances of {@link MetadataCredentialResolver}
 * based on a given instance of {@link MetadataProvider}.  
 * 
 * 
 * Only once instance of a metadata credential resolver will exist for 
 * each metadata provider instance.
 * 
 */
public class MetadataCredentialResolverFactory 
    extends AbstractWrappedSingletonFactory {
    
    /** The global instance of the factory itself. */
    private static MetadataCredentialResolverFactory factory;
    
    /**
     * Constructor.
     * 
     * This constructor hides the superclass public constructor, forcing
     * the single, global factory instance to be obtained from {@link #getFactory()}.
     * 
     */
    protected MetadataCredentialResolverFactory() {
        super();
    }
    
    /**
     * Return the global factory instance.
     * 
     * @return the global factory instance
     */
    public static synchronized MetadataCredentialResolverFactory getFactory() {
        if (factory == null) {
            factory = new MetadataCredentialResolverFactory();
        }
        return factory;
    }

    /** {@inheritDoc} */
    protected MetadataCredentialResolver createNewInstance(MetadataProvider metadataProvider) {
        return new MetadataCredentialResolver(metadataProvider);
    }
    
}