package org.eclipse.jdt.internal.launching;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStreamReader;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import java.net.URL;

import java.net.URLClassLoader;

public class LongCommandLineLauncher {

	/**

	 * usage: LongCommandLineLauncher path/to/urls.lst realMainClass args... 

	 */

	public static void main(String[] args) throws Exception {

		URLClassLoader classLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();

		Class clazz= URLClassLoader.class;

		Method method= clazz.getDeclaredMethod("addURL", new Class[] { URL.class }); //$NON-NLS-1$

		method.setAccessible(true);

		String urlsfile = args[0];

		File f = new File(urlsfile);

		BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(f), "UTF-8")); //$NON-NLS-1$

		String url;

		while(null != (url = reader.readLine())) {

			method.invoke(classLoader, new Object[] { new URL(url) });

		}

		reader.close();

		f.delete();

		String realMainClass = args[1];

		clazz = Class.forName(realMainClass);

		method = clazz.getMethod("main", new Class[] { args.getClass() }); //$NON-NLS-1$

		method.setAccessible(true);

		int mods = method.getModifiers();

		if (method.getReturnType() != void.class || !Modifier.isStatic(mods)

				|| !Modifier.isPublic(mods)) {

			throw new NoSuchMethodException("main"); //$NON-NLS-1$

		}

		String[] args2 = new String[args.length-2];

		System.arraycopy(args, 2, args2, 0, args2.length);

		method.invoke(null, new Object[] { args2 });

	}

}

		int classpathArgIndex = -1;

			classpathArgIndex = arguments.size();

		shortenCommandLine(classpathArgIndex, arguments, cp, config);

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

		int classpathArgIndex = -1;

			classpathArgIndex = arguments.size();

		shortenCommandLine(classpathArgIndex, arguments, cp, config);

	protected void shortenCommandLine(int classpathArgIndex, List arguments, String[] cp, VMRunnerConfiguration config) {

		if (classpathArgIndex > -1

				&& ((String)arguments.get(classpathArgIndex)).length() > 256 // can be shortened

				&& File.separatorChar == '\\' // is Windows

				)

		{

			int cmdLen = 0;

			for (int i = 0, sz = arguments.size(); i < sz; i++) {

				cmdLen += ((String)arguments.get(i)).length() + 1;

			}

			if (cmdLen > 30000) {

				File lclF;

				ArrayList lclShortCp = new ArrayList();

				try {

					lclF = File.createTempFile("eclipse", "tmp");  //$NON-NLS-1$//$NON-NLS-2$

					String lclTempDir = lclF.getAbsolutePath();

					lclF.delete();

					lclF.mkdir();

					Class lclClazz = LongCommandLineLauncher.class;

					String lclClassName = lclClazz.getName().replace('.', '/');

					String lclClassFile = lclClassName.concat(".class"); //$NON-NLS-1$

					String lclAbsClassFile = lclTempDir + '/' + lclClassFile;

					new File(lclAbsClassFile).getParentFile().mkdirs();

					ClassLoader lclCL = lclClazz.getClassLoader();

					InputStream lclIS = lclCL.getResourceAsStream(lclClassFile);

					OutputStream lclOS = new FileOutputStream(lclAbsClassFile);

					byte[] lclBuf = new byte[1024];

					int lclNB;

					while(-1 != (lclNB = lclIS.read(lclBuf, 0, lclBuf.length))) {

						lclOS.write(lclBuf, 0, lclNB);

					}

					lclOS.close();

					lclIS.close();

					lclF = File.createTempFile("urls", ".lst");  //$NON-NLS-1$//$NON-NLS-2$

					OutputStreamWriter lclExtractWriter = new OutputStreamWriter(new FileOutputStream(lclF), "UTF-8"); //$NON-NLS-1$

					String urlsfile = lclF.getAbsolutePath();

					File workingDir = getWorkingDir(config);

					for (int i = 0; i < cp.length; i++) {

						String cpEntry = cp[i];

						lclF = new File(cpEntry);

						if (workingDir != null && !lclF.isAbsolute())

							lclF = new File(new File(workingDir.getPath() + '/' + lclF.getPath()).getCanonicalPath());

						lclExtractWriter.append(lclF.toURI().toString());

						lclExtractWriter.append('\n');

					}

					lclExtractWriter.close();

					lclShortCp.add(lclTempDir);

					String[] shortCpA = new String[lclShortCp.size()];

					lclShortCp.toArray(shortCpA);

					arguments.set(classpathArgIndex, convertClassPath(shortCpA));

					String realMainClass = (String)arguments.get(classpathArgIndex+1);

					arguments.set(classpathArgIndex+1, lclClassName);

					ArrayList lclList = new ArrayList(2);

					lclList.add(urlsfile);

					lclList.add(realMainClass);

					arguments.addAll(classpathArgIndex+2, lclList);

				} catch(Exception e) {

					e.printStackTrace();

					// falback to normal

				}

			}

		}

	}