org.droidparts.http.worker.HTTPInputStream.java Source code

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Here is the source code for org.droidparts.http.worker.HTTPInputStream.java

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/**
 * Copyright 2013 Alex Yanchenko
 * 
 * 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. 
 */
package org.droidparts.http.worker;

import static org.droidparts.contract.Constants.BUFFER_SIZE;
import static org.droidparts.util.Strings.isNotEmpty;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.util.zip.GZIPInputStream;
import java.util.zip.InflaterInputStream;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.droidparts.http.HTTPException;
import org.droidparts.util.L;
import org.droidparts.util.io.IOUtils;

public class HTTPInputStream extends BufferedInputStream {

    public static HTTPInputStream getInstance(HttpURLConnection conn, boolean useErrorStream) throws HTTPException {
        try {
            InputStream is = useErrorStream ? conn.getErrorStream() : conn.getInputStream();
            is = getUnpackedInputStream(conn.getContentEncoding(), is);
            return new HTTPInputStream(is, conn, null);
        } catch (Exception e) {
            throw new HTTPException(e);
        }
    }

    public static HTTPInputStream getInstance(HttpResponse resp) throws HTTPException {
        HttpEntity entity = resp.getEntity();
        try {
            InputStream is = entity.getContent();
            Header ce = entity.getContentEncoding();
            is = getUnpackedInputStream(ce != null ? ce.getValue() : null, is);
            return new HTTPInputStream(is, null, entity);
        } catch (Exception e) {
            throw new HTTPException(e);
        }
    }

    private static InputStream getUnpackedInputStream(String contentEncoding, InputStream is) throws IOException {
        L.d("Content-Encoding: " + contentEncoding);
        if (isNotEmpty(contentEncoding)) {
            contentEncoding = contentEncoding.toLowerCase();
            if (contentEncoding.contains("gzip")) {
                return new GZIPInputStream(is);
            } else if (contentEncoding.contains("deflate")) {
                return new InflaterInputStream(is);
            }
        }
        return is;
    }

    private final HttpURLConnection conn;
    private final HttpEntity entity;

    private HTTPInputStream(InputStream is, HttpURLConnection conn, HttpEntity entity) throws HTTPException {
        super(is, BUFFER_SIZE);
        this.conn = conn;
        this.entity = entity;
    }

    public String readAndClose() throws HTTPException {
        try {
            return IOUtils.readAndCloseInputStream(this);
        } catch (Exception e) {
            throw new HTTPException(e);
        }
    }

    @Override
    public void close() throws IOException {
        super.close();
        if (conn != null) {
            conn.disconnect();
        } else if (entity != null) {
            entity.consumeContent();
        }
    }

}