org.ldp4j.example.InMemoryContainerHandler.java Source code

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Here is the source code for org.ldp4j.example.InMemoryContainerHandler.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-examples:0.2.1
 *   Bundle      : ldp4j-application-examples-0.2.1.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.example;

import java.util.Map;

import org.ldp4j.application.data.Name;
import org.ldp4j.application.ext.ApplicationRuntimeException;
import org.ldp4j.application.ext.ContainerHandler;

import com.google.common.collect.Maps;

/**
 * An example in-memory container handler.
 */
public abstract class InMemoryContainerHandler extends InMemoryResourceHandler implements ContainerHandler {

    private final Map<Name<String>, NameProvider> nameProviders;

    protected InMemoryContainerHandler(String handlerName) {
        super(handlerName);
        this.nameProviders = Maps.newLinkedHashMap();
    }

    /**
     * Add a name provider for a container resource.
     *
     * @param containerName
     *            the name of the container.
     * @param provider
     *            the name provider.
     */
    public final void addNameProvider(Name<String> containerName, NameProvider provider) {
        this.nameProviders.put(containerName, provider);
    }

    /**
     * Return the name provider registered for a given container resource.
     *
     * @param containerName
     *            the name of the container.
     * @return the provider for the specified container resource.
     */
    public final NameProvider nameProvider(Name<?> containerName) {
        NameProvider result = this.nameProviders.get(containerName);
        if (result == null) {
            throw new ApplicationRuntimeException("Unknown container '" + containerName + "'");
        }
        return result;
    }

}