OrResourceLoader


1   package jfun.yan.util.resource;
2   
3   import java.io.InputStream  ;
4   import java.net.URL  ;
5   
6   
7   /**
8    * This class represents a ResourceLoader that
9    * loads resource using a primary ResourceLoader object,
10   * and tries an alternative ResourceLoader if the primary doesn't
11   * find a resource.
12   * <p>
13   * @author Ben Yu
14   * Jan 16, 2006 4:08:55 PM
15   */
16  public class OrResourceLoader implements ResourceLoader {
17    private final ResourceLoader primary;
18    private final ResourceLoader alt;
19    public URL   getResource(String   path) {
20      URL   ret = primary.getResource(path);
21      if(ret==null){
22        ret = alt.getResource(path);
23      }
24      return ret;
25    }
26  
27    public InputStream   getResourceAsStream(String   path) {
28      InputStream   ret = primary.getResourceAsStream(path);
29      if(ret==null){
30        ret = alt.getResourceAsStream(path);
31      }
32      return ret;
33    }
34  
35    /**
36     * Create an OrResourceLoader object.
37     * @param primary the primary ResourceLoader.
38     * @param alt the alternative ResourceLoader.
39     */
40    public OrResourceLoader(ResourceLoader primary, ResourceLoader alt) {
41      this.alt = alt;
42      this.primary = primary;
43    }
44    /**
45     * Get the primary resource.
46     */
47    public ResourceLoader getPrimary(){
48      return primary;
49    }
50    /**
51     * Get the alternative resource.
52     */
53    public ResourceLoader getAlternative(){
54      return alt;
55    }
56  
57    public boolean equals(Object   obj) {
58      if(obj instanceof OrResourceLoader){
59        final OrResourceLoader other = (OrResourceLoader)obj;
60        return primary.equals(other.primary) && alt.equals(other.alt);
61      }
62      else return false;
63    }
64  
65    public int hashCode() {
66      return primary.hashCode()*31+alt.hashCode();
67    }
68  
69    public String   toString() {
70      return primary.toString()+" | " + alt;
71    }
72  }
73
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