/*
 * 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 io.milton.httpclient;

import io.milton.http.Range;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import org.apache.http.client.methods.HttpRequestBase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Implements the HTTP GET method.
 * <p>
 * The HTTP GET method is defined in section 9.3 of
 * <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616</a>:
 * <blockquote>
 * The GET method means retrieve whatever information (in the form of an
 * entity) is identified by the Request-URI. If the Request-URI refers
 * to a data-producing process, it is the produced data which shall be
 * returned as the entity in the response and not the source text of the
 * process, unless that text happens to be the output of the process.
 * </blockquote>
 * </p>
 * <p>
 * GetMethods will follow redirect requests from the http server by default.
 * This behavour can be disabled by calling setFollowRedirects(false).</p>
 *
 * @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
 * @author Sung-Gu Park
 * @author Sean C. Sullivan
 * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
 * @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
 * 
 * @version $Revision: 480424 $
 * @since 1.0
 */
public class RangedGetMethod extends HttpRequestBase {

    // -------------------------------------------------------------- Constants
    /** Log object for this class. */
    private static final Logger log = LoggerFactory.getLogger(RangedGetMethod.class);

    public RangedGetMethod(String uri, List<Range> dataRanges) throws URISyntaxException {
        setURI(new URI(uri));
        if (dataRanges != null && !dataRanges.isEmpty()) {
            String rangeHeaderVal = getRangesRequest(dataRanges);
			log.info("ranges: " + rangeHeaderVal);
            setHeader("Range", "bytes=" + rangeHeaderVal);
        } else {
			log.info("No ranges to get");
		}
    }

    private String getRangesRequest(List<Range> ranges) {
        StringBuilder sb = new StringBuilder();
        for (Range d : ranges) {
            sb.append(d.getRange()).append(",");
        }
        sb.delete(sb.length() - 1, sb.length());
        return sb.toString();
    }

    @Override
    public String getMethod() {
        return "GET";
    }
}