org.apache.tools.ant.launch.Launcher Maven / Gradle / Ivy
The newest version!
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* https://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 org.apache.tools.ant.launch;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
/**
* This is a launcher for Ant.
*
* @since Ant 1.6
*/
public class Launcher {
/**
* The Ant Home (installation) Directory property.
* {@value}
*/
public static final String ANTHOME_PROPERTY = "ant.home";
/**
* The Ant Library Directory property.
* {@value}
*/
public static final String ANTLIBDIR_PROPERTY = "ant.library.dir";
/**
* The directory name of the per-user ant directory.
* {@value}
*/
public static final String ANT_PRIVATEDIR = ".ant";
/**
* The name of a per-user library directory.
* {@value}
*/
public static final String ANT_PRIVATELIB = "lib";
/**
* The location of a per-user library directory.
* It's value is the concatenation of {@link #ANT_PRIVATEDIR}
* with {@link #ANT_PRIVATELIB}, with an appropriate file separator
* in between. For example, on Unix, it's .ant/lib.
*/
public static final String USER_LIBDIR =
ANT_PRIVATEDIR + File.separatorChar + ANT_PRIVATELIB;
/**
* The startup class that is to be run.
* {@value}
*/
public static final String MAIN_CLASS = "org.apache.tools.ant.Main";
/**
* System property with user home directory.
* {@value}
*/
public static final String USER_HOMEDIR = "user.home";
/**
* System property with application classpath.
* {@value}
*/
private static final String JAVA_CLASS_PATH = "java.class.path";
/**
* Exit code on trouble
*/
protected static final int EXIT_CODE_ERROR = 2;
/**
* Entry point for starting command line Ant.
*
* @param args commandline arguments
*/
public static void main(final String[] args) {
int exitCode;
boolean launchDiag = false;
try {
final Launcher launcher = new Launcher();
exitCode = launcher.run(args);
launchDiag = launcher.launchDiag;
} catch (final LaunchException e) {
exitCode = EXIT_CODE_ERROR;
System.err.println(e.getMessage());
} catch (final Throwable t) {
exitCode = EXIT_CODE_ERROR;
t.printStackTrace(System.err); //NOSONAR
}
if (exitCode != 0) {
if (launchDiag) {
System.out.println("Exit code: " + exitCode);
}
System.exit(exitCode);
}
}
/**
* launch diagnostics flag; for debugging trouble at launch time.
*/
public boolean launchDiag = false;
private Launcher() {
}
/**
* Add a CLASSPATH or -lib to lib path urls.
* Only filesystem resources are supported.
*
* @param path the classpath or lib path to add to the libPathULRLs
* @param getJars if true and a path is a directory, add the jars in
* the directory to the path urls
* @param libPathURLs the list of paths to add to
* @throws MalformedURLException if we can't create a URL
*/
private void addPath(final String path, final boolean getJars, final List libPathURLs)
throws MalformedURLException {
final StringTokenizer tokenizer = new StringTokenizer(path, File.pathSeparator);
while (tokenizer.hasMoreElements()) {
final String elementName = tokenizer.nextToken();
final File element = new File(elementName);
if (elementName.contains("%") && !element.exists()) {
continue;
}
if (getJars && element.isDirectory()) {
// add any jars in the directory
for (URL dirURL : Locator.getLocationURLs(element)) {
if (launchDiag) {
System.out.println("adding library JAR: " + dirURL);
}
libPathURLs.add(dirURL);
}
}
final URL url = new URL(element.toURI().toASCIIString());
if (launchDiag) {
System.out.println("adding library URL: " + url);
}
libPathURLs.add(url);
}
}
/**
* Run the launcher to launch Ant.
*
* @param args the command line arguments
* @return an exit code. As the normal ant main calls exit when it ends,
* this is for handling failures at bind-time
* @throws MalformedURLException if the URLs required for the classloader
* cannot be created.
* @throws LaunchException for launching problems
*/
private int run(final String[] args)
throws LaunchException, MalformedURLException {
final String antHomeProperty = System.getProperty(ANTHOME_PROPERTY);
File antHome = null;
final File sourceJar = Locator.getClassSource(getClass());
final File jarDir = sourceJar.getParentFile();
String mainClassname = MAIN_CLASS;
if (antHomeProperty != null) {
antHome = new File(antHomeProperty);
}
if (antHome == null || !antHome.exists()) {
antHome = jarDir.getParentFile();
setProperty(ANTHOME_PROPERTY, antHome.getAbsolutePath());
}
if (!antHome.exists()) {
throw new LaunchException(
"Ant home is set incorrectly or ant could not be located (estimated value="
+ antHome.getAbsolutePath() + ")");
}
final List libPaths = new ArrayList<>();
String cpString = null;
final List argList = new ArrayList<>();
String[] newArgs;
boolean noUserLib = false;
boolean noClassPath = false;
for (int i = 0; i < args.length; ++i) {
if ("-lib".equals(args[i])) {
if (i == args.length - 1) {
throw new LaunchException(
"The -lib argument must be followed by a library location");
}
libPaths.add(args[++i]);
} else if ("-cp".equals(args[i])) {
if (i == args.length - 1) {
throw new LaunchException(
"The -cp argument must be followed by a classpath expression");
}
if (cpString != null) {
throw new LaunchException(
"The -cp argument must not be repeated");
}
cpString = args[++i];
} else if ("--nouserlib".equals(args[i]) || "-nouserlib".equals(args[i])) {
noUserLib = true;
} else if ("--launchdiag".equals(args[i])) {
launchDiag = true;
} else if ("--noclasspath".equals(args[i]) || "-noclasspath".equals(args[i])) {
noClassPath = true;
} else if ("-main".equals(args[i])) {
if (i == args.length - 1) {
throw new LaunchException(
"The -main argument must be followed by a library location");
}
mainClassname = args[++i];
} else {
argList.add(args[i]);
}
}
logPath("Launcher JAR", sourceJar);
logPath("Launcher JAR directory", sourceJar.getParentFile());
logPath("java.home", new File(System.getProperty("java.home")));
//decide whether to copy the existing arg set, or
//build a new one from the list of all args excluding the special
//operations that only we handle
if (argList.size() == args.length) {
newArgs = args;
} else {
newArgs = argList.toArray(new String[0]);
}
final URL[] libURLs = getLibPathURLs(
noClassPath ? null : cpString, libPaths);
final URL[] systemURLs = getSystemURLs(jarDir);
final URL[] userURLs = noUserLib ? new URL[0] : getUserURLs();
final File toolsJAR = Locator.getToolsJar();
logPath("tools.jar", toolsJAR);
final URL[] jars = getJarArray(
libURLs, userURLs, systemURLs, toolsJAR);
// now update the class.path property
final StringBuilder baseClassPath
= new StringBuilder(System.getProperty(JAVA_CLASS_PATH));
if (baseClassPath.charAt(baseClassPath.length() - 1)
== File.pathSeparatorChar) {
baseClassPath.setLength(baseClassPath.length() - 1);
}
for (URL jar : jars) {
baseClassPath.append(File.pathSeparatorChar);
baseClassPath.append(Locator.fromURI(jar.toString()));
}
setProperty(JAVA_CLASS_PATH, baseClassPath.toString());
final URLClassLoader loader = new URLClassLoader(jars, Launcher.class.getClassLoader());
Thread.currentThread().setContextClassLoader(loader);
Class mainClass = null;
int exitCode = 0;
Throwable thrown = null;
try {
mainClass = loader.loadClass(mainClassname).asSubclass(AntMain.class);
final AntMain main = mainClass.getDeclaredConstructor().newInstance();
main.startAnt(newArgs, null, null);
} catch (final InstantiationException ex) {
System.err.println(
"Incompatible version of " + mainClassname + " detected");
final File mainJar = Locator.getClassSource(mainClass);
System.err.println(
"Location of this class " + mainJar);
thrown = ex;
} catch (final ClassNotFoundException cnfe) {
System.err.println(
"Failed to locate" + mainClassname);
thrown = cnfe;
} catch (final Throwable t) {
t.printStackTrace(System.err); //NOSONAR
thrown = t;
}
if (thrown != null) {
System.err.println(ANTHOME_PROPERTY + ": " + antHome.getAbsolutePath());
System.err.println("Classpath: " + baseClassPath.toString());
System.err.println("Launcher JAR: " + sourceJar.getAbsolutePath());
System.err.println("Launcher Directory: " + jarDir.getAbsolutePath());
exitCode = EXIT_CODE_ERROR;
}
return exitCode;
}
/**
* Get the list of -lib entries and -cp entry into
* a URL array.
* @param cpString the classpath string
* @param libPaths the list of -lib entries.
* @return an array of URLs.
* @throws MalformedURLException if the URLs cannot be created.
*/
private URL[] getLibPathURLs(final String cpString, final List libPaths)
throws MalformedURLException {
final List libPathURLs = new ArrayList<>();
if (cpString != null) {
addPath(cpString, false, libPathURLs);
}
for (final String libPath : libPaths) {
addPath(libPath, true, libPathURLs);
}
return libPathURLs.toArray(new URL[0]);
}
/**
* Get the jar files in ANT_HOME/lib.
* determine ant library directory for system jars: use property
* or default using location of ant-launcher.jar
* @param antLauncherDir the dir that ant-launcher ran from
* @return the URLs
* @throws MalformedURLException if the URLs cannot be created.
*/
private URL[] getSystemURLs(final File antLauncherDir) throws MalformedURLException {
File antLibDir = null;
final String antLibDirProperty = System.getProperty(ANTLIBDIR_PROPERTY);
if (antLibDirProperty != null) {
antLibDir = new File(antLibDirProperty);
}
if (antLibDir == null || !antLibDir.exists()) {
antLibDir = antLauncherDir;
setProperty(ANTLIBDIR_PROPERTY, antLibDir.getAbsolutePath());
}
return Locator.getLocationURLs(antLibDir);
}
/**
* Get the jar files in user.home/.ant/lib
* @return the URLS from the user's lib dir
* @throws MalformedURLException if the URLs cannot be created.
*/
private URL[] getUserURLs() throws MalformedURLException {
final File userLibDir
= new File(System.getProperty(USER_HOMEDIR), USER_LIBDIR);
return Locator.getLocationURLs(userLibDir);
}
/**
* Combine the various jar sources into a single array of jars.
* @param libJars the jars specified in -lib command line options
* @param userJars the jars in ~/.ant/lib
* @param systemJars the jars in $ANT_HOME/lib
* @param toolsJar the tools.jar file
* @return a combined array
* @throws MalformedURLException if there is a problem.
*/
private URL[] getJarArray(final URL[] libJars, final URL[] userJars,
final URL[] systemJars, final File toolsJar)
throws MalformedURLException {
int numJars = libJars.length + userJars.length + systemJars.length;
if (toolsJar != null) {
numJars++;
}
final URL[] jars = new URL[numJars];
System.arraycopy(libJars, 0, jars, 0, libJars.length);
System.arraycopy(userJars, 0, jars, libJars.length, userJars.length);
System.arraycopy(systemJars, 0, jars, userJars.length + libJars.length,
systemJars.length);
if (toolsJar != null) {
jars[jars.length - 1] = new URL(toolsJar.toURI().toASCIIString());
}
return jars;
}
/**
* set a system property, optionally log what is going on
* @param name property name
* @param value value
*/
private void setProperty(final String name, final String value) {
if (launchDiag) {
System.out.println("Setting \"" + name + "\" to \"" + value + "\"");
}
System.setProperty(name, value);
}
private void logPath(final String name, final File path) {
if (launchDiag) {
System.out.println(name + "= \"" + path + "\"");
}
}
}