eu.trentorise.smartcampus.storage.ResourceRetriever.java Source code

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Here is the source code for eu.trentorise.smartcampus.storage.ResourceRetriever.java

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/*******************************************************************************
 * Copyright 2012-2013 Trento RISE
 * 
 *    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 eu.trentorise.smartcampus.storage;

import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;

import android.content.Context;
import eu.trentorise.smartcampus.filestorage.client.Filestorage;
import eu.trentorise.smartcampus.filestorage.client.FilestorageException;
import eu.trentorise.smartcampus.filestorage.client.model.Metadata;
import eu.trentorise.smartcampus.filestorage.client.model.Resource;
import eu.trentorise.smartcampus.filestorage.client.model.Token;

public abstract class ResourceRetriever {

    private Filestorage filestorage;

    public ResourceRetriever(Context ctx, String appId, String service) {
        filestorage = new Filestorage(service, appId);

    }

    public Resource getResource(String authToken, String resourceId, Token resourceToken)
            throws FilestorageException, ClientProtocolException, IOException {

        Resource resource = new Resource();
        resource.setContent(getFileContent(resourceToken));

        Metadata metadata = filestorage.getResourceMetadataByUser(authToken, resourceId);
        resource.setId(metadata.getResourceId());
        resource.setContentType(metadata.getContentType());
        resource.setName(metadata.getName());
        return resource;
    }

    private byte[] getFileContent(Token token) throws ClientProtocolException, IOException {
        HttpUriRequest request = null;
        if (token.getUrl() != null && token.getMethodREST() != null) {
            if (token.getMethodREST().equals("GET")) {
                request = new HttpGet(token.getUrl());
            } else if (token.getMethodREST().equals("POST")) {
                request = new HttpPost(token.getUrl());
            } else if (token.getMethodREST().equals("PUT")) {
                request = new HttpPut(token.getUrl());
            } else if (token.getMethodREST().equals("DELETE")) {
                request = new HttpDelete(token.getUrl());
            }

            if (token.getHttpHeaders() != null) {
                for (Entry<String, String> entry : token.getHttpHeaders().entrySet()) {
                    request.setHeader(entry.getKey(), entry.getValue());
                }
            }
            DefaultHttpClient httpclient = new DefaultHttpClient();
            HttpResponse response = httpclient.execute(request);
            if (response.getStatusLine().getStatusCode() == 200) {
                InputStream is = response.getEntity().getContent();
                return eu.trentorise.smartcampus.storage.Utils.read(is);
            }
        } else if (token.getMetadata() != null) {
            return retrieveContent(token.getMetadata());
        }
        return null;
    }

    protected abstract byte[] retrieveContent(Map<String, Object> tokenMetadata);
}