1 files changed, 77 insertions, 0 deletions
diff --git a/src/proguard/optimize/ConstantMemberFilter.java b/src/proguard/optimize/ConstantMemberFilter.java
new file mode 100644
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+++ b/src/proguard/optimize/ConstantMemberFilter.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.optimize;
+
+import proguard.classfile.*;
+import proguard.classfile.util.SimplifiedVisitor;
+import proguard.classfile.visitor.MemberVisitor;
+import proguard.evaluation.value.Value;
+import proguard.optimize.evaluation.StoringInvocationUnit;
+
+/**
+ * This <code>MemberVisitor</code> delegates its visits to program class members
+ * to another given <code>MemberVisitor</code>, but only when the visited
+ * class member has been marked as a constant.
+ *
+ * @see StoringInvocationUnit
+ * @author Eric Lafortune
+ */
+public class ConstantMemberFilter
+extends      SimplifiedVisitor
+implements   MemberVisitor
+{
+    private final MemberVisitor constantMemberVisitor;
+
+
+    /**
+     * Creates a new ConstantMemberFilter.
+     * @param constantMemberVisitor the <code>MemberVisitor</code> to which
+     *                              visits to constant members will be delegated.
+     */
+    public ConstantMemberFilter(MemberVisitor constantMemberVisitor)
+    {
+        this.constantMemberVisitor = constantMemberVisitor;
+    }
+
+
+    // Implementations for MemberVisitor.
+
+    public void visitProgramField(ProgramClass programClass, ProgramField programField)
+    {
+        Value value = StoringInvocationUnit.getFieldValue(programField);
+        if (value != null &&
+            value.isParticular())
+        {
+            constantMemberVisitor.visitProgramField(programClass, programField);
+        }
+    }
+
+
+    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
+    {
+        Value value = StoringInvocationUnit.getMethodReturnValue(programMethod);
+        if (value != null &&
+            value.isParticular())
+        {
+            constantMemberVisitor.visitProgramMethod(programClass, programMethod);
+        }
+    }
+}