[9422] | 1 | /*
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[30829] | 2 | * CustomClassLoader.java
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[9422] | 3 | * Copyright (C) 2005 New Zealand Digital Library, http://www.nzdl.org
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation; either version 2 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 18 | */
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| 19 | package org.greenstone.gsdl3.util;
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| 20 |
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| 21 | import java.net.URL;
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[26255] | 22 | import java.util.Enumeration;
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[9422] | 23 | import java.io.File;
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[26255] | 24 | import java.io.IOException;
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[9422] | 25 |
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[26255] | 26 | /**
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[30829] | 27 | * Looks for classes/resources in the specified resources_dir directory
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[9422] | 28 | */
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[30829] | 29 | public class CustomClassLoader extends ClassLoader
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[26255] | 30 | {
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[9422] | 31 |
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[26255] | 32 | String base_dir = null;
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[10086] | 33 |
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[30829] | 34 | public CustomClassLoader(ClassLoader parent, String resources_dir)
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[26255] | 35 | {
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| 36 | super(parent);
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[30829] | 37 | this.base_dir = resources_dir;
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[26255] | 38 | }
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[26264] | 39 |
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| 40 | // Resource Bundle loading with a class loader will call getResource().
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| 41 | // THe Java implementation of getResource tries using the parent class
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| 42 | // loader to find the resource (or the system class loader if no parent).
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| 43 | // If the resource not found, then it calls the local findResource method.
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| 44 | // Ie parent:child ordering.
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| 45 | // Because we want local files to override default ones, we need
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| 46 | // child:parent ordering, so change getResource to look locally first.
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| 47 | //public URL findResource(String name)
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| 48 | public URL getResource(String name)
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[26255] | 49 | {
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| 50 | File resource_path = new File(this.base_dir, name);
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| 51 | try
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| 52 | {
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| 53 | if (resource_path.exists())
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| 54 | {
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| 55 | return resource_path.toURI().toURL();
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| 56 | }
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| 57 | }
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| 58 | catch (Exception e)
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| 59 | {
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| 60 | }
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| 61 |
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[26264] | 62 | return super.getResource(name);
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[26255] | 63 | }
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[9422] | 64 | }
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