Util.java

/*******************************************************************************
 * Copyright (c) 2015 Jeff Martin.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public
 * License v3.0 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * Contributors:
 * Jeff Martin - initial API and implementation
 ******************************************************************************/
package cuchaz.enigma;

import java.awt.Desktop;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.jar.JarFile;

import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.bytecode.Descriptor;

import com.google.common.io.CharStreams;

public class Util
{
	
	public static int combineHashesOrdered(Object... objs)
	{
		return combineHashesOrdered(Arrays.asList(objs));
	}
	
	public static int combineHashesOrdered(Iterable<Object> objs)
	{
		final int prime = 67;
		int result = 1;
		for(Object obj : objs)
		{
			result *= prime;
			if(obj != null)
				result += obj.hashCode();
		}
		return result;
	}
	
	public static void closeQuietly(Closeable closeable)
	{
		if(closeable != null)
			try
			{
				closeable.close();
			}catch(IOException ex)
			{
				// just ignore any further exceptions
			}
	}
	
	public static void closeQuietly(JarFile jarFile)
	{
		// silly library should implement Closeable...
		if(jarFile != null)
			try
			{
				jarFile.close();
			}catch(IOException ex)
			{
				// just ignore any further exceptions
			}
	}
	
	public static String readStreamToString(InputStream in) throws IOException
	{
		return CharStreams.toString(new InputStreamReader(in, "UTF-8"));
	}
	
	public static String readResourceToString(String path) throws IOException
	{
		InputStream in = Util.class.getResourceAsStream(path);
		if(in == null)
			throw new IllegalArgumentException("Resource not found! " + path);
		return readStreamToString(in);
	}
	
	public static void openUrl(String url)
	{
		if(Desktop.isDesktopSupported())
		{
			Desktop desktop = Desktop.getDesktop();
			try
			{
				desktop.browse(new URI(url));
			}catch(IOException ex)
			{
				throw new Error(ex);
			}catch(URISyntaxException ex)
			{
				throw new IllegalArgumentException(ex);
			}
		}
	}
	
	public static void writeClass(CtClass c)
	{
		String name = Descriptor.toJavaName(c.getName());
		File file = new File(name + ".class");
		try(FileOutputStream out = new FileOutputStream(file))
		{
			out.write(c.toBytecode());
		}catch(IOException | CannotCompileException ex)
		{
			throw new Error(ex);
		}
	}
}