com.helger.httpclient.response.ResponseHandlerJson.java Source code

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Here is the source code for com.helger.httpclient.response.ResponseHandlerJson.java

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/**
 * Copyright (C) 2016-2018 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.helger.httpclient.response;

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

import javax.annotation.Nullable;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.entity.ContentType;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.helger.commons.debug.GlobalDebug;
import com.helger.commons.string.StringHelper;
import com.helger.httpclient.HttpClientHelper;
import com.helger.json.IJson;
import com.helger.json.serialize.JsonReader;

/**
 * Convert a valid HTTP response to an {@link IJson} object.
 *
 * @author Philip Helger
 */
public class ResponseHandlerJson implements ResponseHandler<IJson> {
    private static final Logger LOGGER = LoggerFactory.getLogger(ResponseHandlerJson.class);

    private final boolean m_bDebugMode;

    public ResponseHandlerJson() {
        this(GlobalDebug.isDebugMode());
    }

    public ResponseHandlerJson(final boolean bDebugMode) {
        m_bDebugMode = bDebugMode;
    }

    /**
     * @return <code>true</code> if debug mode is enabled, <code>false</code> if
     *         not.
     * @since 8.8.2
     */
    public boolean isDebugMode() {
        return m_bDebugMode;
    }

    @Nullable
    public IJson handleResponse(final HttpResponse aHttpResponse) throws IOException {
        final HttpEntity aEntity = ResponseHandlerHttpEntity.INSTANCE.handleResponse(aHttpResponse);
        if (aEntity == null)
            throw new ClientProtocolException("Response contains no content");

        final ContentType aContentType = ContentType.getOrDefault(aEntity);
        final Charset aCharset = HttpClientHelper.getCharset(aContentType);

        if (m_bDebugMode) {
            // Read all in String
            final String sJson = StringHelper.trim(EntityUtils.toString(aEntity, aCharset));

            if (LOGGER.isInfoEnabled())
                LOGGER.info("Got JSON: <" + sJson + ">");

            final IJson ret = JsonReader.readFromString(sJson);
            if (ret == null)
                throw new IllegalArgumentException("Failed to parse as JSON: " + sJson);
            return ret;
        }

        // Read via reader to avoid duplication in memory
        final Reader aReader = new InputStreamReader(aEntity.getContent(), aCharset);
        return JsonReader.readFromReader(aReader);
    }
}