Source Code Cross Referenced for ObjectStack.java in  » XML » xalan » org » apache » xml » utils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xalan » org.apache.xml.utils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999-2004 The Apache Software Foundation.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        /*
017:         * $Id$
018:         */
019:        package org.apache.xml.utils;
020:
021:        import java.util.EmptyStackException;
022:
023:        /**
024:         * Implement a stack of simple integers.
025:         *
026:         * %OPT%
027:         * This is currently based on ObjectVector, which permits fast acess but pays a
028:         * heavy recopying penalty if/when its size is increased. If we expect deep
029:         * stacks, we should consider a version based on ChunkedObjectVector.
030:         * @xsl.usage internal
031:         */
032:        public class ObjectStack extends ObjectVector {
033:
034:            /**
035:             * Default constructor.  Note that the default
036:             * block size is very small, for small lists.
037:             */
038:            public ObjectStack() {
039:                super ();
040:            }
041:
042:            /**
043:             * Construct a ObjectVector, using the given block size.
044:             *
045:             * @param blocksize Size of block to allocate
046:             */
047:            public ObjectStack(int blocksize) {
048:                super (blocksize);
049:            }
050:
051:            /**
052:             * Copy constructor for ObjectStack
053:             * 
054:             * @param v ObjectStack to copy
055:             */
056:            public ObjectStack(ObjectStack v) {
057:                super (v);
058:            }
059:
060:            /**
061:             * Pushes an item onto the top of this stack.
062:             *
063:             * @param   i   the int to be pushed onto this stack.
064:             * @return  the <code>item</code> argument.
065:             */
066:            public Object push(Object i) {
067:
068:                if ((m_firstFree + 1) >= m_mapSize) {
069:                    m_mapSize += m_blocksize;
070:
071:                    Object newMap[] = new Object[m_mapSize];
072:
073:                    System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1);
074:
075:                    m_map = newMap;
076:                }
077:
078:                m_map[m_firstFree] = i;
079:
080:                m_firstFree++;
081:
082:                return i;
083:            }
084:
085:            /**
086:             * Removes the object at the top of this stack and returns that
087:             * object as the value of this function.
088:             *
089:             * @return     The object at the top of this stack.
090:             */
091:            public Object pop() {
092:                Object val = m_map[--m_firstFree];
093:                m_map[m_firstFree] = null;
094:
095:                return val;
096:            }
097:
098:            /**
099:             * Quickly pops a number of items from the stack.
100:             */
101:
102:            public void quickPop(int n) {
103:                m_firstFree -= n;
104:            }
105:
106:            /**
107:             * Looks at the object at the top of this stack without removing it
108:             * from the stack.
109:             *
110:             * @return     the object at the top of this stack.
111:             * @throws  EmptyStackException  if this stack is empty.
112:             */
113:            public Object peek() {
114:                try {
115:                    return m_map[m_firstFree - 1];
116:                } catch (ArrayIndexOutOfBoundsException e) {
117:                    throw new EmptyStackException();
118:                }
119:            }
120:
121:            /**
122:             * Looks at the object at the position the stack counting down n items.
123:             *
124:             * @param n The number of items down, indexed from zero.
125:             * @return     the object at n items down.
126:             * @throws  EmptyStackException  if this stack is empty.
127:             */
128:            public Object peek(int n) {
129:                try {
130:                    return m_map[m_firstFree - (1 + n)];
131:                } catch (ArrayIndexOutOfBoundsException e) {
132:                    throw new EmptyStackException();
133:                }
134:            }
135:
136:            /**
137:             * Sets an object at a the top of the statck
138:             *
139:             *
140:             * @param val object to set at the top
141:             * @throws  EmptyStackException  if this stack is empty.
142:             */
143:            public void setTop(Object val) {
144:                try {
145:                    m_map[m_firstFree - 1] = val;
146:                } catch (ArrayIndexOutOfBoundsException e) {
147:                    throw new EmptyStackException();
148:                }
149:            }
150:
151:            /**
152:             * Tests if this stack is empty.
153:             *
154:             * @return  <code>true</code> if this stack is empty;
155:             *          <code>false</code> otherwise.
156:             * @since   JDK1.0
157:             */
158:            public boolean empty() {
159:                return m_firstFree == 0;
160:            }
161:
162:            /**
163:             * Returns where an object is on this stack.
164:             *
165:             * @param   o   the desired object.
166:             * @return  the distance from the top of the stack where the object is]
167:             *          located; the return value <code>-1</code> indicates that the
168:             *          object is not on the stack.
169:             * @since   JDK1.0
170:             */
171:            public int search(Object o) {
172:
173:                int i = lastIndexOf(o);
174:
175:                if (i >= 0) {
176:                    return size() - i;
177:                }
178:
179:                return -1;
180:            }
181:
182:            /**
183:             * Returns clone of current ObjectStack
184:             * 
185:             * @return clone of current ObjectStack
186:             */
187:            public Object clone() throws CloneNotSupportedException {
188:                return (ObjectStack) super.clone();
189:            }
190:
191:        }
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