org.opensocial.explorer.specserver.servlet.ExplorerInjectedServlet.java Source code

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Here is the source code for org.opensocial.explorer.specserver.servlet.ExplorerInjectedServlet.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.opensocial.explorer.specserver.servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.shindig.common.servlet.InjectedServlet;
import org.apache.shindig.gadgets.http.HttpResponse;
import org.apache.wink.json4j.JSONException;
import org.apache.wink.json4j.JSONObject;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

/**
 * An abstract class that provides some helpers for servlets in the OpenSocial Explorer
 */
public abstract class ExplorerInjectedServlet extends InjectedServlet {
    protected static final String JSON_CONTENT_TYPE = "application/json";
    protected static final String HTML_CONTENT_TYPE = "text/html";

    private static final long serialVersionUID = 5905320989280705219L;
    private static final Splitter PATH_SPLITTER = Splitter.on('/').trimResults().omitEmptyStrings();

    public ExplorerInjectedServlet() {
        super();
    }

    protected String getRequestBody(HttpServletRequest req) throws IOException {
        StringBuffer buff = new StringBuffer();
        String line = null;
        BufferedReader reader = req.getReader();
        while ((line = reader.readLine()) != null) {
            buff.append(line);
        }
        return buff.toString();
    }

    protected String[] getPaths(HttpServletRequest req) {
        String path = req.getPathInfo();
        if (path == null) {
            return new String[0];
        }
        Iterable<String> splitPath = PATH_SPLITTER.split(path);
        return Iterables.toArray(splitPath, String.class);
    }

    protected JSONObject parseResponseToJson(HttpResponse response)
            throws JSONException, IllegalStateException, IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(response.getResponse(), "UTF-8"));
        StringBuilder builder = new StringBuilder();
        for (String line = null; (line = reader.readLine()) != null;) {
            builder.append(line).append("\n");
        }
        reader.close();
        return new JSONObject(builder.toString());
    }

    protected String parseResponseToString(HttpResponse response) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(response.getResponse(), "UTF-8"));
        StringBuilder builder = new StringBuilder();
        for (String line = null; (line = reader.readLine()) != null;) {
            builder.append(line);
        }

        reader.close();
        return builder.toString();
    }

    protected Map<String, String> splitQuery(String query) throws IOException, UnsupportedEncodingException {
        Map<String, String> query_pairs = new LinkedHashMap<String, String>();
        String[] pairs = query.split("&");
        for (String pair : pairs) {
            int index = pair.indexOf("=");
            if (index == -1) {
                throw new UnsupportedEncodingException();
            }
            query_pairs.put(URLDecoder.decode(pair.substring(0, index), "UTF-8"),
                    URLDecoder.decode(pair.substring(index + 1), "UTF-8"));
        }
        return query_pairs;
    }
}