nl.igorski.lib.utils.network.ResponseParser.java Source code

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Here is the source code for nl.igorski.lib.utils.network.ResponseParser.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2012-2014 Igor Zinken - http://www.igorski.nl
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package nl.igorski.lib.utils.network;

import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.protocol.HTTP;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.text.ParseException;

/**
 * Created by IntelliJ IDEA.
 * User: igorzinken
 * Date: 03-07-12
 * Time: 19:45
 * To change this template use File | Settings | File Templates.
 */
public final class ResponseParser {
    /* public */

    public static String parse(HttpResponse response) {
        String response_text = null;
        HttpEntity entity = null;

        try {
            entity = response.getEntity();
            response_text = _getResponseBody(entity);
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            if (entity != null) {
                try {
                    entity.consumeContent();
                } catch (IOException e1) {
                }
            }
        }
        return response_text;
    }

    /* private */
    private static String _getResponseBody(final HttpEntity entity) throws IOException, ParseException {
        if (entity == null)
            throw new IllegalArgumentException("HTTP entity may not be null");

        InputStream instream = entity.getContent();

        if (instream == null)
            return "";

        if (entity.getContentLength() > Integer.MAX_VALUE)
            throw new IllegalArgumentException("HTTP entity too large to be buffered in memory");

        String charset = getContentCharSet(entity);

        if (charset == null)
            charset = HTTP.DEFAULT_CONTENT_CHARSET;

        Reader reader = new InputStreamReader(instream, charset);
        StringBuilder buffer = new StringBuilder();

        try {
            char[] tmp = new char[1024];
            int l;
            while ((l = reader.read(tmp)) != -1) {
                buffer.append(tmp, 0, l);
            }
        } finally {
            reader.close();
        }
        return buffer.toString();
    }

    private static String getContentCharSet(final HttpEntity entity) throws ParseException {
        if (entity == null)
            throw new IllegalArgumentException("HTTP entity may not be null");

        String charset = null;

        if (entity.getContentType() != null) {
            HeaderElement values[] = entity.getContentType().getElements();

            if (values.length > 0) {
                NameValuePair param = values[0].getParameterByName("charset");

                if (param != null)
                    charset = param.getValue();
            }
        }
        return charset;
    }
}