1 files changed, 293 insertions, 0 deletions
diff --git a/src/proguard/classfile/attribute/visitor/NonEmptyAttributeFilter.java b/src/proguard/classfile/attribute/visitor/NonEmptyAttributeFilter.java
new file mode 100644
index 0000000..2ccc09c
--- /dev/null
+++ b/src/proguard/classfile/attribute/visitor/NonEmptyAttributeFilter.java
@@ -0,0 +1,293 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2013 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.classfile.attribute.visitor;
+
+import proguard.classfile.*;
+import proguard.classfile.attribute.*;
+import proguard.classfile.attribute.annotation.*;
+import proguard.classfile.attribute.preverification.*;
+import proguard.util.StringMatcher;
+
+/**
+ * This AttributeVisitor delegates its visits another AttributeVisitor, but
+ * only when the visited attribute is not empty. For instance, a local variable
+ * table without variables is empty.
+ *
+ * @author Eric Lafortune
+ */
+public class NonEmptyAttributeFilter
+implements   AttributeVisitor
+{
+    private final AttributeVisitor attributeVisitor;
+
+
+    /**
+     * Creates a new NonEmptyAttributeFilter.
+     * @param attributeVisitor the <code>AttributeVisitor</code> to which
+     *                         visits will be delegated.
+     */
+    public NonEmptyAttributeFilter(AttributeVisitor attributeVisitor)
+    {
+        this.attributeVisitor = attributeVisitor;
+    }
+
+
+    // Implementations for AttributeVisitor.
+
+    public void visitUnknownAttribute(Clazz clazz, UnknownAttribute unknownAttribute)
+    {
+        unknownAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitBootstrapMethodsAttribute(Clazz clazz, BootstrapMethodsAttribute bootstrapMethodsAttribute)
+    {
+        if (bootstrapMethodsAttribute.u2bootstrapMethodsCount > 0)
+        {
+            bootstrapMethodsAttribute.accept(clazz, attributeVisitor);
+        }
+    }
+
+
+    public void visitSourceFileAttribute(Clazz clazz, SourceFileAttribute sourceFileAttribute)
+    {
+        sourceFileAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitSourceDirAttribute(Clazz clazz, SourceDirAttribute sourceDirAttribute)
+    {
+        sourceDirAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitInnerClassesAttribute(Clazz clazz, InnerClassesAttribute innerClassesAttribute)
+    {
+        if (innerClassesAttribute.u2classesCount > 0)
+        {
+            innerClassesAttribute.accept(clazz, attributeVisitor);
+        }
+    }
+
+
+    public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
+    {
+        enclosingMethodAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitDeprecatedAttribute(Clazz clazz, DeprecatedAttribute deprecatedAttribute)
+    {
+        deprecatedAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitDeprecatedAttribute(Clazz clazz, Field field, DeprecatedAttribute deprecatedAttribute)
+    {
+        deprecatedAttribute.accept(clazz, field, attributeVisitor);
+    }
+
+
+    public void visitDeprecatedAttribute(Clazz clazz, Method method, DeprecatedAttribute deprecatedAttribute)
+    {
+        deprecatedAttribute.accept(clazz, method, attributeVisitor);
+    }
+
+
+    public void visitSyntheticAttribute(Clazz clazz, SyntheticAttribute syntheticAttribute)
+    {
+        syntheticAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitSyntheticAttribute(Clazz clazz, Field field, SyntheticAttribute syntheticAttribute)
+    {
+        syntheticAttribute.accept(clazz, field, attributeVisitor);
+    }
+
+
+    public void visitSyntheticAttribute(Clazz clazz, Method method, SyntheticAttribute syntheticAttribute)
+    {
+        syntheticAttribute.accept(clazz, method, attributeVisitor);
+    }
+
+
+    public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute)
+    {
+        signatureAttribute.accept(clazz, attributeVisitor);
+    }
+
+
+    public void visitSignatureAttribute(Clazz clazz, Field field, SignatureAttribute signatureAttribute)
+    {
+        signatureAttribute.accept(clazz, field, attributeVisitor);
+    }
+
+
+    public void visitSignatureAttribute(Clazz clazz, Method method, SignatureAttribute signatureAttribute)
+    {
+        signatureAttribute.accept(clazz, method, attributeVisitor);
+    }
+
+
+    public void visitConstantValueAttribute(Clazz clazz, Field field, ConstantValueAttribute constantValueAttribute)
+    {
+        constantValueAttribute.accept(clazz, field, attributeVisitor);
+    }
+
+
+    public void visitExceptionsAttribute(Clazz clazz, Method method, ExceptionsAttribute exceptionsAttribute)
+    {
+        if (exceptionsAttribute.u2exceptionIndexTableLength > 0)
+        {
+            exceptionsAttribute.accept(clazz, method, attributeVisitor);
+        }
+    }
+
+
+    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
+    {
+        codeAttribute.accept(clazz, method, attributeVisitor);
+    }
+
+
+    public void visitStackMapAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapAttribute stackMapAttribute)
+    {
+        if (stackMapAttribute.u2stackMapFramesCount > 0)
+        {
+            stackMapAttribute.accept(clazz, method, codeAttribute, attributeVisitor);
+        }
+    }
+
+
+    public void visitStackMapTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapTableAttribute stackMapTableAttribute)
+    {
+        if (stackMapTableAttribute.u2stackMapFramesCount > 0)
+        {
+            stackMapTableAttribute.accept(clazz, method, codeAttribute, attributeVisitor);
+        }
+    }
+
+
+    public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
+    {
+        if (lineNumberTableAttribute.u2lineNumberTableLength > 0)
+        {
+            lineNumberTableAttribute.accept(clazz, method, codeAttribute, attributeVisitor);
+        }
+    }
+
+
+    public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute)
+    {
+        if (localVariableTableAttribute.u2localVariableTableLength > 0)
+        {
+            localVariableTableAttribute.accept(clazz, method, codeAttribute, attributeVisitor);
+        }
+    }
+
+
+    public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute)
+    {
+        if (localVariableTypeTableAttribute.u2localVariableTypeTableLength > 0)
+        {
+            localVariableTypeTableAttribute.accept(clazz, method, codeAttribute, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
+    {
+        if (runtimeVisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeVisibleAnnotationsAttribute.accept(clazz, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, Field field, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
+    {
+        if (runtimeVisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeVisibleAnnotationsAttribute.accept(clazz, field, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, Method method, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
+    {
+        if (runtimeVisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeVisibleAnnotationsAttribute.accept(clazz, method, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
+    {
+        if (runtimeInvisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeInvisibleAnnotationsAttribute.accept(clazz, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, Field field, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
+    {
+        if (runtimeInvisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeInvisibleAnnotationsAttribute.accept(clazz, field, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, Method method, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
+    {
+        if (runtimeInvisibleAnnotationsAttribute.u2annotationsCount > 0)
+        {
+            runtimeInvisibleAnnotationsAttribute.accept(clazz, method, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeVisibleParameterAnnotationsAttribute(Clazz clazz, Method method, RuntimeVisibleParameterAnnotationsAttribute runtimeVisibleParameterAnnotationsAttribute)
+    {
+        if (runtimeVisibleParameterAnnotationsAttribute.u2parametersCount > 0)
+        {
+            runtimeVisibleParameterAnnotationsAttribute.accept(clazz, method, attributeVisitor);
+        }
+    }
+
+
+    public void visitRuntimeInvisibleParameterAnnotationsAttribute(Clazz clazz, Method method, RuntimeInvisibleParameterAnnotationsAttribute runtimeInvisibleParameterAnnotationsAttribute)
+    {
+        if (runtimeInvisibleParameterAnnotationsAttribute.u2parametersCount > 0)
+        {
+            runtimeInvisibleParameterAnnotationsAttribute.accept(clazz, method, attributeVisitor);
+        }
+    }
+
+
+    public void visitAnnotationDefaultAttribute(Clazz clazz, Method method, AnnotationDefaultAttribute annotationDefaultAttribute)
+    {
+        annotationDefaultAttribute.accept(clazz, method, attributeVisitor);
+    }
+}