com.msopentech.odatajclient.engine.communication.request.retrieve.ODataLinkCollectionRequest.java Source code

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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 com.msopentech.odatajclient.engine.communication.request.retrieve;

import com.msopentech.odatajclient.engine.client.ODataClient;
import com.msopentech.odatajclient.engine.client.http.HttpClientException;
import com.msopentech.odatajclient.engine.communication.response.ODataRetrieveResponse;
import com.msopentech.odatajclient.engine.data.ODataLinkCollection;
import com.msopentech.odatajclient.engine.format.ODataFormat;
import java.io.IOException;
import java.net.URI;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;

/**
 * This class implements an OData link query request.
 */
public class ODataLinkCollectionRequest extends AbstractODataRetrieveRequest<ODataLinkCollection, ODataFormat> {

    /**
     * Private constructor.
     *
     * @param odataClient client instance getting this request
     * @param targetURI target URI.
     * @param linkName link name.
     */
    ODataLinkCollectionRequest(final ODataClient odataClient, final URI targetURI, final String linkName) {
        super(odataClient, ODataFormat.class,
                odataClient.getURIBuilder(targetURI.toASCIIString()).appendLinksSegment(linkName).build());
    }

    /**
     * {@inheritDoc }
     */
    @Override
    public ODataRetrieveResponse<ODataLinkCollection> execute() {
        return new ODataLinkCollectionResponseImpl(httpClient, doExecute());
    }

    protected class ODataLinkCollectionResponseImpl extends ODataRetrieveResponseImpl {

        private ODataLinkCollection links = null;

        /**
         * Constructor.
         * <p>
         * Just to create response templates to be initialized from batch.
         */
        private ODataLinkCollectionResponseImpl() {
        }

        /**
         * Constructor.
         *
         * @param client HTTP client.
         * @param res HTTP response.
         */
        private ODataLinkCollectionResponseImpl(final HttpClient client, final HttpResponse res) {
            super(client, res);
        }

        /**
         * {@inheritDoc }
         */
        @Override
        public ODataLinkCollection getBody() {
            if (links == null) {
                try {
                    links = odataClient.getReader().readLinks(res.getEntity().getContent(),
                            ODataFormat.fromString(getContentType()));
                } catch (IOException e) {
                    throw new HttpClientException(e);
                } finally {
                    this.close();
                }
            }
            return links;
        }
    }
}