com.google.walkaround.wave.server.servlet.ServletUtil.java Source code

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Here is the source code for com.google.walkaround.wave.server.servlet.ServletUtil.java

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/*
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * 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.google.walkaround.wave.server.servlet;

import com.google.gson.JsonObject;
import com.google.walkaround.wave.shared.SharedConstants;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.PrintWriter;

/**
 * Utilities for the servlets
 *
 * @author danilatos@google.com (Daniel Danilatos)
 */
// TODO(ohler): This is near-empty now, should eliminate altogether, or give it
// a more specific name.
public class ServletUtil {

    /**
     * Writes the string to the print writer according to the protocol the client
     * expects.
     *
     * @param w
     * @param str must be valid JSON
     */
    public static void writeJsonResult(PrintWriter w, String str) {
        try {
            assert new JSONObject(str) != null;
        } catch (JSONException e) {
            throw new IllegalArgumentException("Bad JSON: " + str, e);
        }

        w.print(SharedConstants.XSSI_PREFIX + "(" + str + ")");
    }

    public static String getSubmitDeltaResultJson(long resultingRevision) {
        JsonObject json = new JsonObject();
        json.addProperty("version", resultingRevision);
        return json.toString();
    }

}