package com.sun.org.apache.bcel.internal.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.util.Stack;
/**
* Traverses a JavaClass with another Visitor object 'piggy-backed'
* that is applied to all components of a JavaClass object. I.e. this
* class supplies the traversal strategy, other classes can make use
* of it.
*
* @version $Id: DescendingVisitor.java,v 1.1.2.1 2005/07/31 23:46:23 jeffsuttor Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public class DescendingVisitor implements Visitor {
private JavaClass clazz;
private Visitor visitor;
private Stack stack = new Stack();
/** @return container of current entitity, i.e., predecessor during traversal
*/
public Object predecessor() {
return predecessor(0);
}
/**
* @param level nesting level, i.e., 0 returns the direct predecessor
* @return container of current entitity, i.e., predecessor during traversal
*/
public Object predecessor(int level) {
int size = stack.size();
if((size < 2) || (level < 0))
return null;
else
return stack.elementAt(size - (level + 2)); // size - 1 == current
}
/** @return current object
*/
public Object current() {
return stack.peek();
}
/**
* @param clazz Class to traverse
* @param visitor visitor object to apply to all components
*/
public DescendingVisitor(JavaClass clazz, Visitor visitor) {
this.clazz = clazz;
this.visitor = visitor;
}
/**
* Start traversal.
*/
public void visit() { clazz.accept(this); }
public void visitJavaClass(JavaClass clazz) {
stack.push(clazz);
clazz.accept(visitor);
Field[] fields = clazz.getFields();
for(int i=0; i < fields.length; i++)
fields[i].accept(this);
Method[] methods = clazz.getMethods();
for(int i=0; i < methods.length; i++)
methods[i].accept(this);
Attribute[] attributes = clazz.getAttributes();
for(int i=0; i < attributes.length; i++)
attributes[i].accept(this);
clazz.getConstantPool().accept(this);
stack.pop();
}
public void visitField(Field field) {
stack.push(field);
field.accept(visitor);
Attribute[] attributes = field.getAttributes();
for(int i=0; i < attributes.length; i++)
attributes[i].accept(this);
stack.pop();
}
public void visitConstantValue(ConstantValue cv) {
stack.push(cv);
cv.accept(visitor);
stack.pop();
}
public void visitMethod(Method method) {
stack.push(method);
method.accept(visitor);
Attribute[] attributes = method.getAttributes();
for(int i=0; i < attributes.length; i++)
attributes[i].accept(this);
stack.pop();
}
public void visitExceptionTable(ExceptionTable table) {
stack.push(table);
table.accept(visitor);
stack.pop();
}
public void visitCode(Code code) {
stack.push(code);
code.accept(visitor);
CodeException[] table = code.getExceptionTable();
for(int i=0; i < table.length; i++)
table[i].accept(this);
Attribute[] attributes = code.getAttributes();
for(int i=0; i < attributes.length; i++)
attributes[i].accept(this);
stack.pop();
}
public void visitCodeException(CodeException ce) {
stack.push(ce);
ce.accept(visitor);
stack.pop();
}
public void visitLineNumberTable(LineNumberTable table) {
stack.push(table);
table.accept(visitor);
LineNumber[] numbers = table.getLineNumberTable();
for(int i=0; i < numbers.length; i++)
numbers[i].accept(this);
stack.pop();
}
public void visitLineNumber(LineNumber number) {
stack.push(number);
number.accept(visitor);
stack.pop();
}
public void visitLocalVariableTable(LocalVariableTable table) {
stack.push(table);
table.accept(visitor);
LocalVariable[] vars = table.getLocalVariableTable();
for(int i=0; i < vars.length; i++)
vars[i].accept(this);
stack.pop();
}
public void visitStackMap(StackMap table) {
stack.push(table);
table.accept(visitor);
StackMapEntry[] vars = table.getStackMap();
for(int i=0; i < vars.length; i++)
vars[i].accept(this);
stack.pop();
}
public void visitStackMapEntry(StackMapEntry var) {
stack.push(var);
var.accept(visitor);
stack.pop();
}
public void visitLocalVariable(LocalVariable var) {
stack.push(var);
var.accept(visitor);
stack.pop();
}
public void visitConstantPool(ConstantPool cp) {
stack.push(cp);
cp.accept(visitor);
Constant[] constants = cp.getConstantPool();
for(int i=1; i < constants.length; i++) {
if(constants[i] != null)
constants[i].accept(this);
}
stack.pop();
}
public void visitConstantClass(ConstantClass constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantDouble(ConstantDouble constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantFieldref(ConstantFieldref constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantFloat(ConstantFloat constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantInteger(ConstantInteger constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantInterfaceMethodref(ConstantInterfaceMethodref constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantLong(ConstantLong constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantMethodref(ConstantMethodref constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantNameAndType(ConstantNameAndType constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantString(ConstantString constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitConstantUtf8(ConstantUtf8 constant) {
stack.push(constant);
constant.accept(visitor);
stack.pop();
}
public void visitInnerClasses(InnerClasses ic) {
stack.push(ic);
ic.accept(visitor);
InnerClass[] ics = ic.getInnerClasses();
for(int i=0; i < ics.length; i++)
ics[i].accept(this);
stack.pop();
}
public void visitInnerClass(InnerClass inner) {
stack.push(inner);
inner.accept(visitor);
stack.pop();
}
public void visitDeprecated(Deprecated attribute) {
stack.push(attribute);
attribute.accept(visitor);
stack.pop();
}
public void visitSignature(Signature attribute) {
stack.push(attribute);
attribute.accept(visitor);
stack.pop();
}
public void visitSourceFile(SourceFile attribute) {
stack.push(attribute);
attribute.accept(visitor);
stack.pop();
}
public void visitSynthetic(Synthetic attribute) {
stack.push(attribute);
attribute.accept(visitor);
stack.pop();
}
public void visitUnknown(Unknown attribute) {
stack.push(attribute);
attribute.accept(visitor);
stack.pop();
}
}
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