JSONHandler.java

/*
 * Copyright 2012 Google Inc.
 *
 * 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.android.apps.iosched.io;

import com.google.android.apps.iosched.provider.ScheduleContract;

import android.content.ContentProviderOperation;
import android.content.ContentResolver;
import android.content.Context;
import android.content.OperationApplicationException;
import android.os.RemoteException;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;

public abstract class JSONHandler {

    protected static Context mContext;

    public JSONHandler(Context context) {
        mContext = context;
    }

    public abstract ArrayList<ContentProviderOperation> parse(String json) throws IOException;

    public final void parseAndApply(String json) throws IOException {
        try {
            final ContentResolver resolver = mContext.getContentResolver();
            ArrayList<ContentProviderOperation> batch = parse(json);
            resolver.applyBatch(ScheduleContract.CONTENT_AUTHORITY, batch);
        } catch (RemoteException e) {
            throw new RuntimeException("Problem applying batch operation", e);
        } catch (OperationApplicationException e) {
            throw new RuntimeException("Problem applying batch operation", e);
        }
    }

    public static String parseResource(Context context, int resource) throws IOException {
        InputStream is = context.getResources().openRawResource(resource);
        Writer writer = new StringWriter();
        char[] buffer = new char[1024];
        try {
            Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            int n;
            while ((n = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, n);
            }
        } finally {
            is.close();
        }

        return writer.toString();
    }
}