com.corebase.android.framework.http.client.MyHttpRequest.java Source code

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Here is the source code for com.corebase.android.framework.http.client.MyHttpRequest.java

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/*
Android Asynchronous Http Client
Copyright (c) 2011 James Smith <james@loopj.com>
http://loopj.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.corebase.android.framework.http.client;

import java.io.IOException;
import java.net.ConnectException;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.impl.client.AbstractHttpClient;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

import com.corebase.android.framework.cache.CacheManager;

class MyHttpRequest {
    private final AbstractHttpClient client;
    private final HttpContext context;
    private final HttpUriRequest request;
    private int executionCount;
    private CacheParams cacheParams;
    private String url;

    public MyHttpRequest(AbstractHttpClient client, HttpContext context, HttpUriRequest request,
            CacheParams cacheParams) {
        this.client = client;
        this.context = context;
        this.request = request;
        this.cacheParams = cacheParams;
        this.url = request.getURI().toString();
    }

    //
    public byte[] downloadWithCache() throws ConnectException, Exception {
        byte[] data = null;
        boolean retry = true;
        IOException cause = null;
        HttpRequestRetryHandler retryHandler = client.getHttpRequestRetryHandler();
        while (retry) {
            try {
                //pcgroup?
                if (null != cacheParams && !cacheParams.isRefresh()) {
                    data = CacheManager.getCache(url);
                    if (null != data) {
                        return data;
                    } else {
                        data = executeTask();
                    }
                } else {
                    data = executeTask();
                }
            } catch (IOException e) {
                cause = e;
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            } catch (NullPointerException e) {
                cause = new IOException("NPE in HttpClient" + e.getMessage());
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            }
        }

        // no retries left, crap out with exception
        ConnectException ex = new ConnectException();
        ex.initCause(cause);
        throw ex;
    }

    private byte[] executeTask() throws ClientProtocolException, IOException {
        byte[] byteArray = null;
        HttpResponse response = client.execute(request, context);
        byteArray = getByteArrayAndSendMessage(response);

        //??
        if (null != byteArray && null != cacheParams) {
            CacheManager.setCache(url, byteArray, cacheParams.getExpireTime(), cacheParams.getStoreType());
        }
        return byteArray;
    }

    protected byte[] getByteArrayAndSendMessage(HttpResponse response) throws IOException {
        byte[] responseBody = null;
        Header[] contentTypeHeaders = response.getHeaders("Content-Type");
        if (contentTypeHeaders.length != 1) {
            return null;
        }
        HttpEntity entity = null;
        HttpEntity temp = response.getEntity();
        if (temp != null) {
            entity = new BufferedHttpEntity(temp);
        }
        responseBody = EntityUtils.toByteArray(entity);

        return responseBody;
    }
}