/*
 * Copyright 2011 James Moger.
 *
 * 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.iciql;

import java.net.URL;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

/**
 * Iciql constants.
 */
public class Constants {

	public static final String NAME = "iciql";

	// The build script extracts this exact line so be careful editing it
	// and only use A-Z a-z 0-9 .-_ in the string.
	public static final String API_CURRENT = "15";

	public static String getVersion() {
		String v = Constants.class.getPackage().getImplementationVersion();
		if (v == null) {
			return "0.0.0-SNAPSHOT";
		}
		return v;
	}

	public static String getBuildDate() {
		return getManifestValue("build-date", "PENDING");
	}

	private static String getManifestValue(String attrib, String defaultValue) {
		Class<?> clazz = Constants.class;
		String className = clazz.getSimpleName() + ".class";
		String classPath = clazz.getResource(className).toString();
		if (!classPath.startsWith("jar")) {
			// Class not from JAR
			return defaultValue;
		}
		try {
			String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) + "/META-INF/MANIFEST.MF";
			Manifest manifest = new Manifest(new URL(manifestPath).openStream());
			Attributes attr = manifest.getMainAttributes();
			String value = attr.getValue(attrib);
			return value;
		} catch (Exception e) {
		}
		return defaultValue;
	}
}