org.apache.abdera2.protocol.client.AbderaResponseHandler.java Source code

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  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.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.abdera2.protocol.client;

import java.io.IOException;
import java.io.InputStream;

import org.apache.abdera2.Abdera;
import org.apache.abdera2.common.http.ResponseType;
import org.apache.abdera2.common.io.Compression;
import org.apache.abdera2.model.Document;
import org.apache.abdera2.model.Element;
import org.apache.abdera2.parser.ParserOptions;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.util.EntityUtils;

class AbderaResponseHandler implements ResponseHandler<Document<? extends Element>> {

    private final Abdera abdera;
    private final ParserOptions options;

    public AbderaResponseHandler() {
        this(Abdera.getInstance());
    }

    public AbderaResponseHandler(Abdera abdera) {
        this(Abdera.getInstance(), null);
    }

    public AbderaResponseHandler(ParserOptions options) {
        this(Abdera.getInstance(), options);
    }

    public AbderaResponseHandler(Abdera abdera, ParserOptions options) {
        this.abdera = abdera;
        this.options = options;
    }

    public Document<? extends Element> handleResponse(HttpResponse response)
            throws ClientProtocolException, IOException {
        ResponseType type = ResponseType.select(response.getStatusLine().getStatusCode());
        switch (type) {
        case SUCCESSFUL:
            return options == null ? abdera.getParser().parse(getInputStream(response))
                    : abdera.getParser().parse(getInputStream(response), options);
        default:
            EntityUtils.consume(response.getEntity());
            StatusLine status = response.getStatusLine();
            throw new HttpResponseException(status.getStatusCode(), status.getReasonPhrase());
        }

    }

    private static InputStream getInputStream(HttpResponse response) throws IOException {
        InputStream in = null;
        Header he = response.getFirstHeader("Content-Encoding");
        String ce = he != null ? he.getValue() : null;
        BufferedHttpEntity buffer = new BufferedHttpEntity(response.getEntity());
        in = buffer.getContent();
        if (ce != null && in != null)
            in = Compression.wrap(in, ce);
        return in;
    }
}