1 | /*
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2 | * CollectionClassLoader.java
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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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22 | import java.util.Enumeration;
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23 | import java.io.File;
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24 | import java.io.IOException;
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25 |
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26 | /**
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27 | * Looks for classes/resources in the collection resources directory
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28 | */
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29 | public class CollectionClassLoader extends ClassLoader
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30 | {
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31 |
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32 | String base_dir = null;
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33 |
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34 | public CollectionClassLoader(ClassLoader parent, String site_home, String collection_name)
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35 | {
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36 | super(parent);
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37 | // 'resources directory' in the collection
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38 | this.base_dir = GSFile.collectionResourceDir(site_home, collection_name);
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39 | }
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40 |
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41 | // Resource Bundle loading with a class loader will call getResource().
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42 | // THe Java implementation of getResource tries using the parent class
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43 | // loader to find the resource (or the system class loader if no parent).
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44 | // If the resource not found, then it calls the local findResource method.
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45 | // Ie parent:child ordering.
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46 | // Because we want local files to override default ones, we need
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47 | // child:parent ordering, so change getResource to look locally first.
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48 | //public URL findResource(String name)
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49 | public URL getResource(String name)
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50 | {
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51 | File resource_path = new File(this.base_dir, name);
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52 | try
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53 | {
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54 | if (resource_path.exists())
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55 | {
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56 | return resource_path.toURI().toURL();
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57 | }
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58 | }
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59 | catch (Exception e)
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60 | {
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61 | }
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62 |
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63 | return super.getResource(name);
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64 | }
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65 | }
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