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1
11
12 package org.eclipse.ui.internal.expressions;
13
14 import java.util.Collection  ;
15
16 import org.eclipse.core.expressions.EvaluationResult;
17 import org.eclipse.core.expressions.Expression;
18 import org.eclipse.core.expressions.ExpressionInfo;
19 import org.eclipse.core.expressions.IEvaluationContext;
20 import org.eclipse.core.runtime.CoreException;
21 import org.eclipse.ui.ISources;
22 import org.eclipse.ui.IWorkbenchWindow;
23
24
39 public final class LegacyViewerContributionExpression extends
40 WorkbenchWindowExpression {
41
42
45 private static final int HASH_INITIAL = LegacyViewerContributionExpression.class
46 .getName().hashCode();
47
48
52 private final Expression expression;
53
54
58 private final String targetId;
59
60
74 public LegacyViewerContributionExpression(final String targetId,
75 final IWorkbenchWindow window, final Expression childExpression) {
76 super(window);
77
78 if (targetId == null) {
79 throw new NullPointerException ("The targetId cannot be null"); }
81 this.targetId = targetId;
82 this.expression = childExpression;
83 }
84
85 public final void collectExpressionInfo(final ExpressionInfo info) {
86 super.collectExpressionInfo(info);
87 info.addVariableNameAccess(ISources.ACTIVE_MENU_NAME);
88 if (expression != null) {
89 expression.collectExpressionInfo(info);
90 }
91 }
92
93 protected final int computeHashCode() {
94 int hashCode = HASH_INITIAL * HASH_FACTOR + hashCode(getWindow());
95 hashCode = hashCode * HASH_FACTOR + hashCode(expression);
96 hashCode = hashCode * HASH_FACTOR + hashCode(targetId);
97 return hashCode;
98 }
99
100 public final boolean equals(final Object object) {
101 if (object instanceof LegacyViewerContributionExpression) {
102 final LegacyViewerContributionExpression that = (LegacyViewerContributionExpression) object;
103 return equals(this.targetId, that.targetId)
104 && equals(this.expression, that.expression)
105 && equals(this.getWindow(), that.getWindow());
106 }
107
108 return false;
109 }
110
111 public final EvaluationResult evaluate(final IEvaluationContext context)
112 throws CoreException {
113 final EvaluationResult result = super.evaluate(context);
114 if (result == EvaluationResult.FALSE) {
115 return result;
116 }
117
118 final Object value = context.getVariable(ISources.ACTIVE_MENU_NAME);
119 if (value instanceof String ) {
120 final String menuId = (String ) value;
121 if (targetId.equals(menuId)) {
122 if (expression == null) {
123 return EvaluationResult.TRUE;
124 }
125
126 return expression.evaluate(context);
127 }
128 } else if (value instanceof Collection ) {
129 final Collection menuIds = (Collection ) value;
130 if (menuIds.contains(targetId)) {
131 if (expression == null) {
132 return EvaluationResult.TRUE;
133 }
134
135 return expression.evaluate(context);
136 }
137 }
138
139 return EvaluationResult.FALSE;
140 }
141
142 public final String toString() {
143 final StringBuffer buffer = new StringBuffer ();
144 buffer.append("ViewerContributionExpression("); buffer.append(targetId);
146 buffer.append(',');
147 buffer.append(expression);
148 buffer.append(',');
149 buffer.append(getWindow());
150 buffer.append(')');
151 return buffer.toString();
152 }
153 }
154 |
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