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	/*
	* Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* 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 com.sun.org.apache.bcel.internal.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 1749603 2016-06-21 20:50:19Z ggregory $
	*/
	public class DescendingVisitor implements Visitor {

	private final JavaClass clazz;

	private final Visitor visitor;

	private final Stack<Object> 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(final int level) {
	final 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(final JavaClass clazz, final Visitor visitor) {
	this.clazz = clazz;
	this.visitor = visitor;
	}

	/**
	* Start traversal.
	*/
	public void visit() {
	clazz.accept(this);
	}

	@Override
	public void visitJavaClass(final JavaClass _clazz) {
	stack.push(_clazz);
	_clazz.accept(visitor);
	final Field[] fields = _clazz.getFields();
	for (final Field field : fields) {
	field.accept(this);
	}
	final Method[] methods = _clazz.getMethods();
	for (final Method method : methods) {
	method.accept(this);
	}
	final Attribute[] attributes = _clazz.getAttributes();
	for (final Attribute attribute : attributes) {
	attribute.accept(this);
	}
	_clazz.getConstantPool().accept(this);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitAnnotation(final Annotations annotation) {
	stack.push(annotation);
	annotation.accept(visitor);
	final AnnotationEntry[] entries = annotation.getAnnotationEntries();
	for (final AnnotationEntry entrie : entries) {
	entrie.accept(this);
	}
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitAnnotationEntry(final AnnotationEntry annotationEntry) {
	stack.push(annotationEntry);
	annotationEntry.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitField(final Field field) {
	stack.push(field);
	field.accept(visitor);
	final Attribute[] attributes = field.getAttributes();
	for (final Attribute attribute : attributes) {
	attribute.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitConstantValue(final ConstantValue cv) {
	stack.push(cv);
	cv.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitMethod(final Method method) {
	stack.push(method);
	method.accept(visitor);
	final Attribute[] attributes = method.getAttributes();
	for (final Attribute attribute : attributes) {
	attribute.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitExceptionTable(final ExceptionTable table) {
	stack.push(table);
	table.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitCode(final Code code) {
	stack.push(code);
	code.accept(visitor);
	final CodeException[] table = code.getExceptionTable();
	for (final CodeException element : table) {
	element.accept(this);
	}
	final Attribute[] attributes = code.getAttributes();
	for (final Attribute attribute : attributes) {
	attribute.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitCodeException(final CodeException ce) {
	stack.push(ce);
	ce.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitLineNumberTable(final LineNumberTable table) {
	stack.push(table);
	table.accept(visitor);
	final LineNumber[] numbers = table.getLineNumberTable();
	for (final LineNumber number : numbers) {
	number.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitLineNumber(final LineNumber number) {
	stack.push(number);
	number.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitLocalVariableTable(final LocalVariableTable table) {
	stack.push(table);
	table.accept(visitor);
	final LocalVariable[] vars = table.getLocalVariableTable();
	for (final LocalVariable var : vars) {
	var.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitStackMap(final StackMap table) {
	stack.push(table);
	table.accept(visitor);
	final StackMapEntry[] vars = table.getStackMap();
	for (final StackMapEntry var : vars) {
	var.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitStackMapEntry(final StackMapEntry var) {
	stack.push(var);
	var.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitLocalVariable(final LocalVariable var) {
	stack.push(var);
	var.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantPool(final ConstantPool cp) {
	stack.push(cp);
	cp.accept(visitor);
	final Constant[] constants = cp.getConstantPool();
	for (int i = 1; i < constants.length; i++) {
	if (constants[i] != null) {
	constants[i].accept(this);
	}
	}
	stack.pop();
	}

	@Override
	public void visitConstantClass(final ConstantClass constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantDouble(final ConstantDouble constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantFieldref(final ConstantFieldref constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantFloat(final ConstantFloat constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantInteger(final ConstantInteger constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantInterfaceMethodref(
	final ConstantInterfaceMethodref constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitConstantInvokeDynamic(
	final ConstantInvokeDynamic constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantLong(final ConstantLong constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantMethodref(final ConstantMethodref constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantNameAndType(final ConstantNameAndType constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantString(final ConstantString constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitConstantUtf8(final ConstantUtf8 constant) {
	stack.push(constant);
	constant.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitInnerClasses(final InnerClasses ic) {
	stack.push(ic);
	ic.accept(visitor);
	final InnerClass[] ics = ic.getInnerClasses();
	for (final InnerClass ic2 : ics) {
	ic2.accept(this);
	}
	stack.pop();
	}

	@Override
	public void visitInnerClass(final InnerClass inner) {
	stack.push(inner);
	inner.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitBootstrapMethods(final BootstrapMethods bm) {
	stack.push(bm);
	bm.accept(visitor);
	// BootstrapMethod[] bms = bm.getBootstrapMethods();
	// for (int i = 0; i < bms.length; i++)
	// {
	// bms[i].accept(this);
	// }
	stack.pop();
	}

	@Override
	public void visitDeprecated(final Deprecated attribute) {
	stack.push(attribute);
	attribute.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitSignature(final Signature attribute) {
	stack.push(attribute);
	attribute.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitSourceFile(final SourceFile attribute) {
	stack.push(attribute);
	attribute.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitSynthetic(final Synthetic attribute) {
	stack.push(attribute);
	attribute.accept(visitor);
	stack.pop();
	}

	@Override
	public void visitUnknown(final Unknown attribute) {
	stack.push(attribute);
	attribute.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitAnnotationDefault(final AnnotationDefault obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitEnclosingMethod(final EnclosingMethod obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitLocalVariableTypeTable(final LocalVariableTypeTable obj) {
	stack.push(obj);
	obj.accept(visitor);
	LocalVariable[] vars = obj.getLocalVariableTypeTable();
	for (LocalVariable var : vars) {
	var.accept(this);
	}
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitParameterAnnotation(final ParameterAnnotations obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitMethodParameters(final MethodParameters obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitConstantMethodType(final ConstantMethodType obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitConstantMethodHandle(final ConstantMethodHandle obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	/**
	* @since 6.0
	*/
	@Override
	public void visitParameterAnnotationEntry(final ParameterAnnotationEntry obj) {
	stack.push(obj);
	obj.accept(visitor);
	stack.pop();
	}

	}

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