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Diffstat (limited to 'src/proguard/classfile/attribute/Attribute.java')
-rw-r--r-- | src/proguard/classfile/attribute/Attribute.java | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/proguard/classfile/attribute/Attribute.java b/src/proguard/classfile/attribute/Attribute.java new file mode 100644 index 0000000..2e16e22 --- /dev/null +++ b/src/proguard/classfile/attribute/Attribute.java @@ -0,0 +1,142 @@ +/* + * 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.attribute; + +import proguard.classfile.*; +import proguard.classfile.attribute.visitor.AttributeVisitor; + +/** + * This abstract class represents an attribute that is attached to a class, + * a class member, or a code attribute. Specific types of attributes are + * subclassed from it. + * + * @author Eric Lafortune + * @noinspection AbstractClassWithoutAbstractMethods + */ +public abstract class Attribute implements VisitorAccepter +{ + public int u2attributeNameIndex; + //public int u4attributeLength; + //public byte info[]; + + /** + * An extra field in which visitors can store information. + */ + public Object visitorInfo; + + + /** + * Create an uninitialized Attribute. + */ + protected Attribute() + { + } + + + /** + * Create an initialized Attribute. + */ + protected Attribute(int u2attributeNameIndex) + { + this.u2attributeNameIndex = u2attributeNameIndex; + } + + + /** + * Returns the String name of the attribute. + */ + public String getAttributeName(Clazz clazz) + { + return clazz.getString(u2attributeNameIndex); + } + + + // Methods to be implemented by extensions, if applicable. + + /** + * Accepts the given visitor. + */ + public void accept(Clazz clazz, AttributeVisitor attributeVisitor) + { + throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called"); + } + + /** + * Accepts the given visitor in the context of the given field. + */ + public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor) + { + // Delegate the default invocation if the field is null anyway. + if (field == null) + { + accept(clazz, attributeVisitor); + } + else + { + throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called"); + } + } + + /** + * Accepts the given visitor in the context of the given method. + */ + public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) + { + // Delegate the default invocation if the method is null anyway. + if (method == null) + { + accept(clazz, (Field)null, attributeVisitor); + } + else + { + throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called"); + } + } + + /** + * Accepts the given visitor in the context of the given code attribute. + */ + public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, AttributeVisitor attributeVisitor) + { + // Delegate the default invocation if the code attribute is null anyway. + if (codeAttribute == null) + { + accept(clazz, method, attributeVisitor); + } + else + { + throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called"); + } + } + + + // Implementations for VisitorAccepter. + + public Object getVisitorInfo() + { + return visitorInfo; + } + + public void setVisitorInfo(Object visitorInfo) + { + this.visitorInfo = visitorInfo; + } +} |