blob: 44c27535c80e2de3ef4d2a33319bc31123f2e3f9 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*******************************************************************************
* Copyright (c) 2006, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.internal.utility.jdt;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jpt.core.utility.jdt.AnnotationElementAdapter;
import org.eclipse.jpt.core.utility.jdt.DeclarationAnnotationElementAdapter;
import org.eclipse.jpt.core.utility.jdt.Member;
import org.eclipse.jpt.utility.internal.StringTools;
/**
* Wrap another annotation element adapter and short-circuit the
* #setValue method if the value has not changed.
*/
public class ShortCircuitAnnotationElementAdapter<T>
implements AnnotationElementAdapter<T>
{
/** the wrapped adapter */
private final AnnotationElementAdapter<T> adapter;
// ********** constructor **********
public ShortCircuitAnnotationElementAdapter(Member member, DeclarationAnnotationElementAdapter<T> daea) {
this(new MemberAnnotationElementAdapter<T>(member, daea));
}
public ShortCircuitAnnotationElementAdapter(AnnotationElementAdapter<T> adapter) {
super();
this.adapter = adapter;
}
// ********** AnnotationElementAdapter implementation **********
public T getValue() {
return this.adapter.getValue();
}
public T getValue(CompilationUnit astRoot) {
return this.adapter.getValue(astRoot);
}
public void setValue(T value) {
this.setValue(this.adapter.getValue(), value);
}
public Expression getExpression(CompilationUnit astRoot) {
return this.adapter.getExpression(astRoot);
}
public ASTNode getAstNode(CompilationUnit astRoot) {
return this.adapter.getAstNode(astRoot);
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.adapter);
}
// ********** internal methods **********
/**
* set the adapter's value to the specified new value if it
* is different from the specified old value
*/
protected void setValue(T oldValue, T newValue) {
if (oldValue == null) {
if (newValue == null) { // null => null
// do nothing
} else { // null => object
this.adapter.setValue(newValue);
}
} else {
if (newValue == null) { // object => null
this.adapter.setValue(null);
} else { // object => object
if (this.valuesAreEqual(oldValue, newValue)) {
// do nothing
} else {
this.adapter.setValue(newValue);
}
}
}
}
/**
* both values are non-null when this method is called
*/
protected boolean valuesAreEqual(T oldValue, T newValue) {
return newValue.equals(oldValue);
}
}
|
