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1
4 package com.tc.util.diff;
5
6 import org.apache.commons.lang.builder.EqualsBuilder;
7
8 import com.tc.util.Assert;
9 import com.tc.util.StandardStringifier;
10 import com.tc.util.Stringifier;
11
12 import java.util.Collection  ;
13 import java.util.Iterator ;
14 import java.util.LinkedList ;
15 import java.util.List ;
16
17
20 public class DifferenceContext {
21
22 private final DifferenceContext previous;
23 private final String thisContext;
24 private final List differences;
25 private final Stringifier stringifier;
26
27 private DifferenceContext(DifferenceContext previous, String thisContext) {
28 Assert.assertNotNull(previous);
29 Assert.assertNotBlank(thisContext);
30
31 this.previous = previous;
32 this.thisContext = thisContext;
33 this.differences = this.previous.differences;
34 this.stringifier = this.previous.stringifier;
35 }
36
37 public DifferenceContext(Stringifier stringifier) {
38 Assert.assertNotNull(stringifier);
39
40 this.previous = null;
41 this.thisContext = "";
42 this.differences = new LinkedList ();
43 this.stringifier = stringifier;
44 }
45
46 public static DifferenceContext createInitial() {
47 return createInitial(StandardStringifier.INSTANCE);
48 }
49
50 public static DifferenceContext createInitial(Stringifier stringifier) {
51 return new DifferenceContext(stringifier);
52 }
53
54 public DifferenceContext sub(String context) {
55 return new DifferenceContext(this, context);
56 }
57
58
61 Collection collection() {
62 return this.differences;
63 }
64
65 Stringifier stringifier() {
66 return this.stringifier;
67 }
68
69 String describe(Object o) {
70 return this.stringifier.toString(o);
71 }
72
73 void addDifference(Difference difference) {
74 Assert.assertNotNull(difference);
75 Assert.eval(difference.where() == this);
76 this.differences.add(difference);
77 }
78
79 Iterator getDifferences() {
80 return this.differences.iterator();
81 }
82
83 boolean hasDifferences() {
84 return this.differences.size() > 0;
85 }
86
87
90 int countDifferences() {
91 return this.differences.size();
92 }
93
94 public String toString() {
95 if (this.previous != null) return this.previous.toString() + "/" + this.thisContext;
96 else return this.thisContext;
97 }
98
99 public boolean equals(Object that) {
100 if (!this.rawEquals(that)) return false;
101
102 return new EqualsBuilder().append(this.differences, ((DifferenceContext) that).differences).isEquals();
103 }
104
105 boolean rawEquals(Object that) {
106 if (!(that instanceof DifferenceContext)) return false;
107
108 DifferenceContext diffThat = (DifferenceContext) that;
109
110 if ((this.previous == null) != (diffThat.previous == null)) return false;
111 if (this.previous != null && (!this.previous.rawEquals(diffThat.previous))) return false;
112
113 return new EqualsBuilder().append(this.thisContext, diffThat.thisContext).isEquals();
114 }
115
116 } |
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