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Diffstat (limited to 'src/proguard/classfile/constant/visitor/ConstantTagFilter.java')
| -rw-r--r-- | src/proguard/classfile/constant/visitor/ConstantTagFilter.java | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/proguard/classfile/constant/visitor/ConstantTagFilter.java b/src/proguard/classfile/constant/visitor/ConstantTagFilter.java new file mode 100644 index 0000000..bfa7149 --- /dev/null +++ b/src/proguard/classfile/constant/visitor/ConstantTagFilter.java @@ -0,0 +1,86 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2011 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.constant.visitor; + +import proguard.classfile.Clazz; +import proguard.classfile.constant.*; +import proguard.classfile.util.SimplifiedVisitor; + +/** + * This <code>ConstantVisitor</code> delegates its visits to one or more + * specified types of constants. + * + * @author Eric Lafortune + */ +public class ConstantTagFilter +extends SimplifiedVisitor +implements ConstantVisitor +{ + private final int constantTagMask; + private final ConstantVisitor constantVisitor; + + + /** + * Creates a new ConstantTagFilter. + * @param constantTag the type of constants for which visits will be + * delegated. + * @param constantVisitor the <code>ConstantVisitor</code> to which visits + * will be delegated. + */ + public ConstantTagFilter(int constantTag, + ConstantVisitor constantVisitor) + { + this.constantTagMask = 1 << constantTag; + this.constantVisitor = constantVisitor; + } + + + /** + * Creates a new ConstantTagFilter. + * @param constantTags the types of constants for which visits will be + * delegated. + * @param constantVisitor the <code>ConstantVisitor</code> to which visits + * will be delegated. + */ + public ConstantTagFilter(int[] constantTags, + ConstantVisitor constantVisitor) + { + int constantTagMask = 0; + for (int index = 0; index < constantTags.length; index++) + { + constantTagMask |= 1 << constantTags[index]; + } + + this.constantTagMask = constantTagMask; + this.constantVisitor = constantVisitor; + } + + + // Implementations for ConstantVisitor. + + public void visitAnyConstant(Clazz clazz, Constant constant) + { + if (((1 << constant.getTag()) & constantTagMask) != 0) + { + constant.accept(clazz, constantVisitor); + } + } +}
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