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Ness HTTP client component.
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/**
 * Copyright (C) 2012 Ness Computing, Inc.
 *
 * 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 com.nesscomputing.httpclient.response;

import com.nesscomputing.httpclient.HttpClientResponse;
import com.nesscomputing.logging.Log;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import javax.annotation.concurrent.Immutable;

import com.google.common.base.Objects;
import com.google.common.io.CharStreams;
import com.google.common.io.Closeables;

/**
 * A basic implementation of ContentConverter when you only want a string back.
 */
@Immutable
public class StringContentConverter extends AbstractErrorHandlingContentConverter
{
    public static final ContentConverter DEFAULT_CONVERTER = new StringContentConverter();
    public static final ContentConverter DEFAULT_404OK_CONVERTER = new StringContentConverter(true);

    public static final ContentResponseHandler DEFAULT_RESPONSE_HANDLER = ContentResponseHandler.forConverter(DEFAULT_CONVERTER);
    public static final ContentResponseHandler DEFAULT_404OK_RESPONSE_HANDLER = ContentResponseHandler.forConverter(DEFAULT_404OK_CONVERTER);

    private static final Log LOG = Log.findLog();

    private final boolean ignore404;

    protected StringContentConverter()
    {
        this(false);
    }

    protected StringContentConverter(final boolean ignore404)
    {
        this.ignore404 = ignore404;
    }

    @Override
    public String convert(HttpClientResponse httpClientResponse, InputStream inputStream) throws IOException
    {
        final int responseCode = httpClientResponse.getStatusCode();
        switch (responseCode) {
            case 200:
            case 201:
                final Charset charset = Charset.forName(Objects.firstNonNull(httpClientResponse.getCharset(), "UTF-8"));
                final InputStreamReader reader = new InputStreamReader(inputStream, charset);

                try {
                    return CharStreams.toString(reader);
                }
                finally {
                    Closeables.closeQuietly(reader);
                }

            case 204:
                return "";

            case 404:
                if (ignore404) {
                    return "";
                }

                // FALL THROUGH

            default:
                LOG.warn("Remote service responded to \"%s\" with code %d (cause: %s)", httpClientResponse.getUri(), responseCode, httpClientResponse.getStatusText());
                throw new HttpResponseException(httpClientResponse);
        }
    }
}