Summary


1   /* Copyright (c) 2003 The Nutch Organization.  All rights reserved.   */
2   /* Use subject to the conditions in http://www.nutch.org/LICENSE.txt. */
3   
4   package net.nutch.searcher;
5   
6   import java.util.ArrayList  ;
7   import net.nutch.html.Entities;
8   
9   /** A document summary dynamically generated to match a query. */
10  public class Summary {
11  
12    /** A fragment of text within a summary. */
13    public static class Fragment {
14      private String   text;
15  
16      /** Constructs a fragment for the given text. */
17      public Fragment(String   text) { this.text = text; }
18  
19      /** Returns the text of this fragment. */
20      public String   getText() { return text; }
21  
22      /** Returns true iff this fragment is to be highlighted. */
23      public boolean isHighlight() { return false; }
24  
25      /** Returns true iff this fragment is an ellipsis. */
26      public boolean isEllipsis() { return false; }
27  
28      /** Returns an HTML representation of this fragment. */
29      public String   toString() { return Entities.encode(text); }
30    }
31  
32    /** A highlighted fragment of text within a summary. */
33    public static class Highlight extends Fragment {
34      /** Constructs a highlighted fragment for the given text. */
35      public Highlight(String   text) { super(text); }
36  
37      /** Returns true. */
38      public boolean isHighlight() { return true; }
39  
40      /** Returns an HTML representation of this fragment. */
41      public String   toString() { return "<b>" + super.toString() + "</b>"; }
42    }
43  
44    /** An ellipsis fragment within a summary. */
45    public static class Ellipsis extends Fragment {
46      /** Constructs an ellipsis fragment for the given text. */
47      public Ellipsis() { super(" ... "); }
48  
49      /** Returns true. */
50      public boolean isEllipsis() { return true; }
51  
52      /** Returns an HTML representation of this fragment. */
53      public String   toString() { return "<b> ... </b>"; }
54    }
55  
56    private ArrayList   fragments = new ArrayList  ();
57  
58    private static final Fragment[] FRAGMENT_PROTO = new Fragment[0];
59  
60    /** Constructs an empty Summary.*/
61    public Summary() {}
62  
63    /** Adds a fragment to a summary.*/
64    public void add(Fragment fragment) { fragments.add(fragment); }
65  
66    /** Returns an array of all of this summary's fragments.*/
67    public Fragment[] getFragments() {
68      return (Fragment[])fragments.toArray(FRAGMENT_PROTO);
69    }
70  
71    /** Returns an HTML representation of this fragment. */
72    public String   toString() {
73      StringBuffer   buffer = new StringBuffer  ();
74      for (int i = 0; i < fragments.size(); i++) {
75        buffer.append(fragments.get(i));
76      }
77      return buffer.toString();
78    }
79  }
80
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