/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel.classfile;
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 1606490 2014-06-29 12:17:14Z ggregory $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public class DescendingVisitor implements Visitor
{
private JavaClass clazz;
private Visitor visitor;
private Stack<Object> stack = new Stack<Object>();
/**
* @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;
}
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 (Field field : fields) {
field.accept(this);
}
Method[] methods = _clazz.getMethods();
for (Method method : methods) {
method.accept(this);
}
Attribute[] attributes = _clazz.getAttributes();
for (Attribute attribute : attributes) {
attribute.accept(this);
}
_clazz.getConstantPool().accept(this);
stack.pop();
}
public void visitAnnotation(Annotations annotation)
{
stack.push(annotation);
annotation.accept(visitor);
AnnotationEntry[] entries = annotation.getAnnotationEntries();
for (AnnotationEntry entrie : entries) {
entrie.accept(this);
}
stack.pop();
}
public void visitAnnotationEntry(AnnotationEntry annotationEntry)
{
stack.push(annotationEntry);
annotationEntry.accept(visitor);
stack.pop();
}
public void visitField(Field field)
{
stack.push(field);
field.accept(visitor);
Attribute[] attributes = field.getAttributes();
for (Attribute attribute : attributes) {
attribute.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 (Attribute attribute : attributes) {
attribute.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 (CodeException element : table) {
element.accept(this);
}
Attribute[] attributes = code.getAttributes();
for (Attribute attribute : attributes) {
attribute.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 (LineNumber number : numbers) {
number.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 (LocalVariable var : vars) {
var.accept(this);
}
stack.pop();
}
public void visitStackMap(StackMap table)
{
stack.push(table);
table.accept(visitor);
StackMapEntry[] vars = table.getStackMap();
for (StackMapEntry var : vars) {
var.accept(this);
}
stack.pop();
}
public void visitStackMapEntry(StackMapEntry var)
{
stack.push(var);
var.accept(visitor);
stack.pop();
}
public void visitStackMapTable(StackMapTable table)
{
stack.push(table);
table.accept(visitor);
StackMapTableEntry[] vars = table.getStackMapTable();
for (StackMapTableEntry var : vars) {
var.accept(this);
}
stack.pop();
}
public void visitStackMapTableEntry(StackMapTableEntry 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 (InnerClass ic2 : ics) {
ic2.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();
}
public void visitAnnotationDefault(AnnotationDefault obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
public void visitEnclosingMethod(EnclosingMethod obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
public void visitLocalVariableTypeTable(LocalVariableTypeTable obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
public void visitParameterAnnotation(ParameterAnnotations obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
public void visitBootstrapMethods(BootstrapMethods obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
public void visitMethodParameters(MethodParameters obj)
{
stack.push(obj);
obj.accept(visitor);
stack.pop();
}
}