org.codehaus.groovy.tools.LoaderConfiguration Maven / Gradle / Ivy
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/*
* 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
*
* 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 org.codehaus.groovy.tools;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Class used to configure a RootLoader from a stream or by using
* its methods.
*
* The stream can be for example a FileInputStream from a file with
* the following format:
*
*
* # comment
* main is classname
* load path
* load file
* load pathWith${property}
* load pathWith!{required.property}
* load path/*.jar
* load path/**/*.jar
*
*
* - All lines starting with "#" are ignored.
* - The "main is" part may only be once in the file. The String
* afterwards is the name of a class with a main method.
* - The "load" command will add the given file or path to the
* classpath in this configuration object. If the path does not
* exist, the path will be ignored.
*
* - properties referenced using !{x} are required.
* - properties referenced using ${x} are not required. If the
* property does not exist the whole load instruction line will
* be ignored.
* - * is used to match zero or more characters in a file.
* - ** is used to match zero or more directories.
* - Loading paths with
load ./*.jar or load *.jar are not supported.
*
*
* Defining the main class is required unless setRequireMain(boolean) is
* called with false, before reading the configuration.
* You can use the wildcard "*" to filter the path, but only for files, not
* directories. To match directories use "**". The ${propertyname} is replaced by the value of the system's
* property name. You can use user.home here for example. If the property does
* not exist, an empty string will be used. If the path or file after the load
* command does not exist, the path will be ignored.
*
* @author Jochen Theodorou
* @see RootLoader
*/
public class LoaderConfiguration {
private static final String MAIN_PREFIX = "main is", LOAD_PREFIX = "load", GRAB_PREFIX = "grab", PROP_PREFIX = "property";
private List classPath = new ArrayList();
private String main;
private boolean requireMain;
private static final char WILDCARD = '*';
private static final String ALL_WILDCARD = "" + WILDCARD + WILDCARD;
private static final String MATCH_FILE_NAME = "\\\\E[^/]+?\\\\Q";
private static final String MATCH_ALL = "\\\\E.+?\\\\Q";
private final List grabList = new ArrayList();
/**
* creates a new loader configuration
*/
public LoaderConfiguration() {
this.requireMain = true;
}
/**
* configures this loader with a stream
*
* @param is stream used to read the configuration
* @throws IOException if reading or parsing the contents of the stream fails
*/
public void configure(InputStream is) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
int lineNumber = 0;
while (true) {
String line = reader.readLine();
if (line == null) break;
line = line.trim();
lineNumber++;
if (line.startsWith("#") || line.length() == 0) continue;
if (line.startsWith(LOAD_PREFIX)) {
String loadPath = line.substring(LOAD_PREFIX.length()).trim();
loadPath = assignProperties(loadPath);
loadFilteredPath(loadPath);
} else if (line.startsWith(GRAB_PREFIX)) {
String grabParams = line.substring(GRAB_PREFIX.length()).trim();
grabList.add(assignProperties(grabParams));
} else if (line.startsWith(MAIN_PREFIX)) {
if (main != null)
throw new IOException("duplicate definition of main in line " + lineNumber + " : " + line);
main = line.substring(MAIN_PREFIX.length()).trim();
} else if (line.startsWith(PROP_PREFIX)) {
String params = line.substring(PROP_PREFIX.length()).trim();
int index = params.indexOf('=');
if (index == -1) {
throw new IOException("unexpected property format - expecting name=value" + lineNumber + " : " + line);
}
String propName = params.substring(0, index);
String propValue = assignProperties(params.substring(index + 1));
System.setProperty(propName, propValue);
} else {
throw new IOException("unexpected line in " + lineNumber + " : " + line);
}
}
if (requireMain && main == null) throw new IOException("missing main class definition in config file");
}
/*
* Expands the properties inside the given string to it's values.
*/
private static String assignProperties(String str) {
int propertyIndexStart = 0, propertyIndexEnd = 0;
boolean requireProperty;
String result = "";
while (propertyIndexStart < str.length()) {
{
int i1 = str.indexOf("${", propertyIndexStart);
int i2 = str.indexOf("!{", propertyIndexStart);
if (i1 == -1) {
propertyIndexStart = i2;
} else if (i2 == -1) {
propertyIndexStart = i1;
} else {
propertyIndexStart = Math.min(i1, i2);
}
requireProperty = propertyIndexStart == i2;
}
if (propertyIndexStart == -1) break;
result += str.substring(propertyIndexEnd, propertyIndexStart);
propertyIndexEnd = str.indexOf("}", propertyIndexStart);
if (propertyIndexEnd == -1) break;
String propertyKey = str.substring(propertyIndexStart + 2, propertyIndexEnd);
String propertyValue = System.getProperty(propertyKey);
// assume properties contain paths
if (propertyValue == null) {
if (requireProperty) {
throw new IllegalArgumentException("Variable " + propertyKey + " in groovy-starter.conf references a non-existent System property! Try passing the property to the VM using -D" + propertyKey + "=myValue in JAVA_OPTS");
} else {
return null;
}
}
propertyValue = getSlashyPath(propertyValue);
propertyValue = correctDoubleSlash(propertyValue, propertyIndexEnd, str);
result += propertyValue;
propertyIndexEnd++;
propertyIndexStart = propertyIndexEnd;
}
if (propertyIndexStart == -1 || propertyIndexStart >= str.length()) {
result += str.substring(propertyIndexEnd);
} else if (propertyIndexEnd == -1) {
result += str.substring(propertyIndexStart);
}
return result;
}
private static String correctDoubleSlash(String propertyValue, int propertyIndexEnd, String str) {
int index = propertyIndexEnd + 1;
if (index < str.length() && str.charAt(index) == '/' &&
propertyValue.endsWith("/") &&
propertyValue.length() > 0) {
propertyValue = propertyValue.substring(0, propertyValue.length() - 1);
}
return propertyValue;
}
/*
* Load a possibly filtered path. Filters are defined
* by using the * wildcard like in any shell.
*/
private void loadFilteredPath(String filter) {
if (filter == null) return;
filter = getSlashyPath(filter);
int starIndex = filter.indexOf(WILDCARD);
if (starIndex == -1) {
addFile(new File(filter));
return;
}
boolean recursive = filter.contains(ALL_WILDCARD);
if (filter.lastIndexOf('/') < starIndex) {
starIndex = filter.lastIndexOf('/') + 1;
}
String startDir = filter.substring(0, starIndex - 1);
File root = new File(startDir);
filter = Pattern.quote(filter);
filter = filter.replaceAll("\\" + WILDCARD + "\\" + WILDCARD, MATCH_ALL);
filter = filter.replaceAll("\\" + WILDCARD, MATCH_FILE_NAME);
Pattern pattern = Pattern.compile(filter);
final File[] files = root.listFiles();
if (files != null) {
findMatchingFiles(files, pattern, recursive);
}
}
private void findMatchingFiles(File[] files, Pattern pattern, boolean recursive) {
for (File file : files) {
String fileString = getSlashyPath(file.getPath());
Matcher m = pattern.matcher(fileString);
if (m.matches() && file.isFile()) {
addFile(file);
}
if (file.isDirectory() && recursive) {
final File[] dirFiles = file.listFiles();
if (dirFiles != null) {
findMatchingFiles(dirFiles, pattern, true);
}
}
}
}
// change path representation to something more system independent.
// This solution is based on an absolute path
private static String getSlashyPath(final String path) {
String changedPath = path;
if (File.separatorChar != '/')
changedPath = changedPath.replace(File.separatorChar, '/');
return changedPath;
}
/**
* Adds a file to the classpath if it exists.
*
* @param file the file to add
*/
public void addFile(File file) {
if (file != null && file.exists()) {
try {
classPath.add(file.toURI().toURL());
} catch (MalformedURLException e) {
throw new AssertionError("converting an existing file to an url should have never thrown an exception!");
}
}
}
/**
* Adds a file to the classpath if it exists.
*
* @param filename the name of the file to add
*/
public void addFile(String filename) {
if (filename != null) addFile(new File(filename));
}
/**
* Adds a classpath to this configuration. It expects a string with
* multiple paths, separated by the system dependent path separator.
* Expands wildcards, e.g. dir/* into all the jars in dir.
*
* @param path the path as a path separator delimited string
* @see java.io.File#pathSeparator
*/
public void addClassPath(String path) {
String[] paths = path.split(File.pathSeparator);
for (String cpPath : paths) {
// Check to support wild card classpath
if (cpPath.endsWith("*")) {
File dir = new File(cpPath.substring(0, cpPath.length() - 1));
File[] files = dir.listFiles();
if (files != null) {
for (File file : files) {
if (file.isFile() && file.getName().endsWith(".jar")) addFile(file);
}
}
} else {
addFile(new File(cpPath));
}
}
}
/**
* The classpath as URL[] from this configuration.
* This can be used to construct a class loader.
*
* @return the classpath
* @see java.net.URLClassLoader
*/
public URL[] getClassPathUrls() {
return classPath.toArray(new URL[classPath.size()]);
}
/**
* The extra grab configuration.
*
* @return the list of grab urls
*/
public List getGrabUrls() {
return grabList;
}
/**
* Returns the name of the main class for this configuration.
*
* @return the name of the main class or null if not defined
*/
public String getMainClass() {
return main;
}
/**
* Sets the main class. If there is already a main class
* it is overwritten. Calling {@link #configure(InputStream)}
* after calling this method does not require a main class
* definition inside the stream.
*
* @param classname the name to become the main class
*/
public void setMainClass(String classname) {
main = classname;
requireMain = false;
}
/**
* Determines if a main class is required when calling.
*
* @param requireMain set to false if no main class is required
* @see #configure(InputStream)
*/
public void setRequireMain(boolean requireMain) {
this.requireMain = requireMain;
}
}