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Diffstat (limited to 'src/proguard/classfile/visitor/ClassPresenceFilter.java')
-rw-r--r-- | src/proguard/classfile/visitor/ClassPresenceFilter.java | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/proguard/classfile/visitor/ClassPresenceFilter.java b/src/proguard/classfile/visitor/ClassPresenceFilter.java new file mode 100644 index 0000000..429c340 --- /dev/null +++ b/src/proguard/classfile/visitor/ClassPresenceFilter.java @@ -0,0 +1,93 @@ +/* + * 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.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; + } +} |