Get the full path to the first JAR in classpath that contains pattern as a substring. - Java Reflection

Java examples for Reflection:Jar

  1. HOME
  2. Java
  3. Reflection
  4. Jar

Description

Get the full path to the first JAR in classpath that contains pattern as a substring.

Demo Code

/*/*  w  w  w.ja  va 2 s .  com*/
 * Copyright (C) 2006-2007 Mindquarry GmbH, All Rights Reserved
 * 
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 */
//package com.java2s;
import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

public class Main {
    /**
     * Get the full path to the first JAR in classpath that contains 
     * <tt>pattern</tt> as a substring.
     * @throws IOException if pattern cannot be found
     */
    public static String getJar(String pattern) throws IOException {
        Set<String> patterns = new HashSet<String>();
        patterns.add(pattern);
        return getJar(patterns);
    }

    /**
     * Get the full path to the first JAR in classpath that contains 
     * one of <tt>patterns</tt> as a substring.
     * @throws IOException if no pattern can be found
     */
    public static String getJar(Set<String> patterns) throws IOException {
        String path = null;
        String classpath = System.getProperty("java.class.path"); //$NON-NLS-1$
        String[] cpEntries = classpath.split(File.pathSeparator);
        for (String cpEntry : cpEntries) {
            for (String targetPattern : patterns) {
                if (cpEntry.contains(targetPattern)) {
                    path = cpEntry;
                    break;
                }
            }
        }
        if (path == null) {
            throw new IOException("Could not find JAR in classpath. "
                    + "Expected one of these JARs: " + patterns
                    + ", Classpath: " + classpath);
        }
        return path;
    }
}

Related Tutorials