зеркало из https://github.com/mozilla/gecko-dev.git
268 строки
6.9 KiB
C++
268 строки
6.9 KiB
C++
/*
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* (C) Copyright The MITRE Corporation 1999 All rights reserved.
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* The program provided "as is" without any warranty express or
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* implied, including the warranty of non-infringement and the implied
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* warranties of merchantibility and fitness for a particular purpose.
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* The Copyright owner will not be liable for any damages suffered by
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* you as a result of using the Program. In no event will the Copyright
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* owner be liable for any special, indirect or consequential damages or
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* lost profits even if the Copyright owner has been advised of the
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* possibility of their occurrence.
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*
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* Please see release.txt distributed with this file for more information.
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*
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*/
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#include "NodeStack.h"
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#include <iostream.h>
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/**
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* @author <a href="kvisco@mitre.org">Keith Visco</a>
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* <BR/>
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* <PRE>
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* Modifications:
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* 19990806: Larry Fitzpatrick
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* - moved initialization of DEFAULT_SIZE from NodeStack.h to here
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* </PRE>
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*
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**/
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//-------------/
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//- Constants -/
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//-------------/
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const int NodeStack::DEFAULT_SIZE = 25;
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//----------------/
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//- Constructors -/
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//----------------/
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/**
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* Creates a new NodeStack with the default Size
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**/
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NodeStack::NodeStack() {
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initialize(DEFAULT_SIZE);
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} //-- NodeStack
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/**
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* Creates a new NodeStack with the specified size
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**/
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NodeStack::NodeStack(int size) {
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initialize(size);
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} //-- NodeStack
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/**
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* Helper method for Constructors
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**/
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void NodeStack::initialize(int size) {
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elements = new Node*[size];
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elementCount = 0;
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bufferSize = size;
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initialSize = size;
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} //-- initialize
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/**
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* Destructor for NodeSet
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**/
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NodeStack::~NodeStack() {
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delete [] elements;
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} //-- ~NodeStack
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/**
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* Returns the specified Node from the top of this Stack,
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* without removing it from the stack.
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* @param node the Node to add to the top of the Stack
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* @return a pointer to the Node that is the top of this Stack
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**/
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Node* NodeStack::peek() {
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return get(size()-1);
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} //-- peek
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/**
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* Removes the specified Node from the top of this Stack.
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* @param node the Node to add to the top of the Stack
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* @return a pointer to the Node that was the top of this Stack
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**/
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Node* NodeStack::pop() {
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return remove(size()-1);
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} //-- pop
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/**
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* Adds the specified Node to the top of this Stack.
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* @param node the Node to add to the top of the Stack
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**/
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void NodeStack::push(Node* node) {
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if (elementCount == bufferSize) increaseSize();
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elements[elementCount++] = node;
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} //-- push
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/**
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* Removes all elements from the Stack
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**/
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void NodeStack::clear() {
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for (int i = 0; i < elementCount; i++) {
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elements[i] = 0;
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}
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elementCount = 0;
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} //-- clear
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/**
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* Returns true if the specified Node is contained in the Stack.
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* if the specfied Node is null, then if the NodeStack contains a null
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* value, true will be returned.
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* @param node the element to search the NodeStack for
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* @return true if specified Node is contained in the NodeStack
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**/
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MBool NodeStack::contains(Node* node) {
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cout << "NodeStack#contains [enter]\n";
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MBool retVal = (indexOf(node) >= 0) ? MB_TRUE : MB_FALSE;
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cout << "NodeStack#contains [exit]\n";
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return retVal;
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} //-- contains
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/**
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* Compares the specified NodeStack with this NodeStack for equality.
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* Returns true if and only if the specified NodeStack is the same
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* size as this NodeSet and all of its associated
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* Nodes are contained within this NodeStack in the same order.
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* @return true if and only if the specified NodeStack is the
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* same size as this NodeStack and all of its associated
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* Nodes are contained within this NodeStack in the same order.
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**/
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MBool NodeStack::equals(NodeStack* nodeStack) {
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if (!nodeStack) return MB_FALSE;
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if (nodeStack->size() != size()) return MB_FALSE;
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for (int i = 0; i < size(); i++) {
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if (nodeStack->get(i) != get(i)) return MB_FALSE;
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}
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return MB_TRUE;
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} //-- equals
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/**
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* Returns the Node at the specified position in this NodeStack.
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* @param index the position of the Node to return
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**/
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Node* NodeStack::get(int index) {
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if ((index < 0) || index >= elementCount) return 0;
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return elements[index];
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} //-- get
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/**
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* Returns the index of the specified Node,
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* or -1 if the Node is not contained in the NodeStack
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* @param node the Node to get the index for
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**/
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int NodeStack::indexOf(Node* node) {
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for (int i = 0; i < elementCount; i++) {
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if (node == elements[i]) {
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return i;
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}
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}
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return -1;
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} //-- indexOf
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/**
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* Returns true if there are no Nodes in the NodeStack.
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* @return true if there are no Nodes in the NodeStack.
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**/
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MBool NodeStack::isEmpty() {
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return (elementCount == 0) ? MB_TRUE : MB_FALSE;
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} //-- isEmpty
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/**
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* Removes the Node at the specified index from the NodeStack
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* @param index the position in the NodeStack to remove the Node from
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* @return the Node that was removed from the NodeStack
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**/
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Node* NodeStack::remove(int index) {
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if ((index < 0) || (index > elementCount)) return 0;
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Node* node = elements[index];
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shiftDown(index+1);
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--elementCount;
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return node;
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} //-- remove
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/**
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* Removes the the specified Node from the NodeStack
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* @param node the Node to remove from the NodeStack
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* @return true if the Node was removed from the list
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**/
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MBool NodeStack::remove(Node* node) {
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int index = indexOf(node);
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if (index > -1) {
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remove(index);
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}
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else return MB_FALSE;
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return MB_TRUE;
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} //-- remove
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/**
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* Returns the number of elements in the NodeStack
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* @return the number of elements in the NodeStack
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**/
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int NodeStack::size() {
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return elementCount;
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} //-- size
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//-------------------/
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//- Private Methods -/
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//-------------------/
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/**
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* increase the NodeStack capacity by a factor of its initial size
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**/
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void NodeStack::increaseSize() {
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bufferSize += bufferSize;
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Node** tmpNodes = elements;
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elements = new Node*[bufferSize];
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for (int i=0;i < elementCount; i++) {
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elements[i] = tmpNodes[i];
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}
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delete [] tmpNodes;
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} //-- increaseSize
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/**
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* Shifts all elements at the specified index to down by 1
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**/
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void NodeStack::shiftDown(int index) {
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if ((index <= 0) || (index >= elementCount)) return;
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//-- from Java
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//-- System.arraycopy(elements, index, elements, index - 1, elementCount - index);
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for (int i = index; i < elementCount; i++) {
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elements[index-1] = elements[index];
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}
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elements[elementCount-1] = 0;
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} //-- shiftDown
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/**
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* Shifts all elements at the specified index up by 1
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**/
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void NodeStack::shiftUp(int index) {
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if (index == elementCount) return;
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if (elementCount == bufferSize) increaseSize();
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//-- from Java
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//-- System.arraycopy(elements, index, elements, index + 1, elementCount - index);
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for (int i = elementCount; i > index; i--) {
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elements[i] = elements[i-1];
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}
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} //-- shiftUp
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