AssetAdapter.java

/*
 * Copyright 2013 Hannes Janetzek
 *
 * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.oscim.backend;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * The Class AssetAdapter.
 */
public abstract class AssetAdapter {

	/** The instance provided by backend */
	static AssetAdapter g;

	/**
	 * Open file from asset path as stream.
	 */
	protected abstract InputStream openFileAsStream(String file);

	public static InputStream readFileAsStream(String file) {
		return g.openFileAsStream(file);
	}

	public static String readTextFile(String file) {
		StringBuilder sb = new StringBuilder();

		InputStream is = g.openFileAsStream(file);
		if (is == null)
			return null;

		BufferedReader r = new BufferedReader(new InputStreamReader(is));
		String line;
		try {
			while ((line = r.readLine()) != null) {
				sb.append(line).append('\n');
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

		return sb.toString();

	}

	public static void init(AssetAdapter adapter) {
		g = adapter;
	}
}