1 files changed, 93 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/visitor/ClassPresenceFilter.java b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/visitor/ClassPresenceFilter.java
new file mode 100644
index 0000000000..115b37ba9c
--- /dev/null
+++ b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/visitor/ClassPresenceFilter.java
@@ -0,0 +1,93 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
+ *
+ * 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.visitor;
+
+import proguard.classfile.*;
+
+/**
+ * This <code>ClassVisitor</code> delegates its visits to one of two
+ * <code>ClassVisitor</code> instances, depending on whether the name of
+ * the visited class file is present in a given <code>ClassPool</code> or not.
+ *
+ * @author Eric Lafortune
+ */
+public class ClassPresenceFilter implements ClassVisitor
+{
+    private final ClassPool    classPool;
+    private final ClassVisitor presentClassVisitor;
+    private final ClassVisitor missingClassVisitor;
+
+
+    /**
+     * Creates a new ClassPresenceFilter.
+     * @param classPool           the <code>ClassPool</code> in which the
+     *                            presence will be tested.
+     * @param presentClassVisitor the <code>ClassVisitor</code> to which visits
+     *                            of present class files will be delegated.
+     * @param missingClassVisitor the <code>ClassVisitor</code> to which visits
+     *                            of missing class files will be delegated.
+     */
+    public ClassPresenceFilter(ClassPool    classPool,
+                               ClassVisitor presentClassVisitor,
+                               ClassVisitor missingClassVisitor)
+    {
+        this.classPool           = classPool;
+        this.presentClassVisitor = presentClassVisitor;
+        this.missingClassVisitor = missingClassVisitor;
+    }
+
+
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        ClassVisitor classFileVisitor = classFileVisitor(programClass);
+
+        if (classFileVisitor != null)
+        {
+            classFileVisitor.visitProgramClass(programClass);
+        }
+    }
+
+
+    public void visitLibraryClass(LibraryClass libraryClass)
+    {
+        ClassVisitor classFileVisitor = classFileVisitor(libraryClass);
+
+        if (classFileVisitor != null)
+        {
+            classFileVisitor.visitLibraryClass(libraryClass);
+        }
+    }
+
+
+    // Small utility methods.
+
+    /**
+     * Returns the appropriate <code>ClassVisitor</code>.
+     */
+    private ClassVisitor classFileVisitor(Clazz clazz)
+    {
+        return classPool.getClass(clazz.getName()) != null ?
+            presentClassVisitor :
+            missingClassVisitor;
+    }
+}