Source Code Cross Referenced for ObjectSinkNodeList.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » reteoo » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.reteoo 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.drools.reteoo;
002:
003:        import java.io.Serializable;
004:        import java.util.Iterator;
005:        import java.util.NoSuchElementException;
006:
007:        /*
008:         * Copyright 2005 JBoss Inc
009:         * 
010:         * Licensed under the Apache License, Version 2.0 (the "License");
011:         * you may not use this file except in compliance with the License.
012:         * You may obtain a copy of the License at
013:         * 
014:         *      http://www.apache.org/licenses/LICENSE-2.0
015:         * 
016:         * Unless required by applicable law or agreed to in writing, software
017:         * distributed under the License is distributed on an "AS IS" BASIS,
018:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
019:         * See the License for the specific language governing permissions and
020:         * limitations under the License.
021:         */
022:
023:        /**
024:         * This is a simple linked linked implementation. Each node must implement </code>LinkedListNode<code> so that it references
025:         * the node before and after it. This way a node can be removed without having to scan the list to find it. This class
026:         * does not provide an Iterator implementation as its designed for efficiency and not genericity. There are a number of 
027:         * ways to iterate the list.
028:         * <p>
029:         * Simple iterator:
030:         * <pre>
031:         * for ( LinkedListNode node = list.getFirst(); node != null; node =  node.getNext() ) {
032:         * }
033:         * </pre>
034:         * 
035:         * Iterator that pops the first entry:
036:         * <pre>
037:         * for ( LinkedListNode node = list.removeFirst(); node != null; node = list.removeFirst() ) {
038:         * }
039:         * </pre>
040:         *
041:         *
042:         * @author <a href="mailto:mark.proctor@jboss.com">Mark Proctor</a>
043:         * @author <a href="mailto:bob@werken.com">Bob McWhirter</a>
044:         *
045:         */
046:        public class ObjectSinkNodeList implements  Serializable {
047:            private static final long serialVersionUID = 400L;
048:
049:            private ObjectSinkNode firstNode;
050:            private ObjectSinkNode lastNode;
051:
052:            private int size;
053:
054:            /**
055:             * Construct an empty <code>LinkedList</code>
056:             */
057:            public ObjectSinkNodeList() {
058:
059:            }
060:
061:            /**
062:             * Add a <code>ObjectSinkNode</code> to the list. If the <code>LinkedList</code> is empty then the first and 
063:             * last nodes are set to the added node.
064:             * 
065:             * @param node
066:             *      The <code>ObjectSinkNode</code> to be added
067:             */
068:            public void add(final ObjectSinkNode node) {
069:                if (this .firstNode == null) {
070:                    this .firstNode = node;
071:                    this .lastNode = node;
072:                    ;
073:                } else {
074:                    this .lastNode.setNextObjectSinkNode(node);
075:                    node.setPreviousObjectSinkNode(this .lastNode);
076:                    this .lastNode = node;
077:                }
078:                this .size++;
079:            }
080:
081:            /**
082:             * Removes a <code>ObjectSinkNode</code> from the list. This works by attach the previous reference to the child reference.
083:             * When the node to be removed is the first node it calls <code>removeFirst()</code>. When the node to be removed is the last node
084:             * it calls <code>removeLast()</code>.
085:             * 
086:             * @param node
087:             *      The <code>ObjectSinkNode</code> to be removed.
088:             */
089:            public void remove(final ObjectSinkNode node) {
090:                if ((this .firstNode != node) && (this .lastNode != node)) {
091:                    node.getPreviousObjectSinkNode().setNextObjectSinkNode(
092:                            node.getNextObjectSinkNode());
093:                    node.getNextObjectSinkNode().setPreviousObjectSinkNode(
094:                            node.getPreviousObjectSinkNode());
095:                    this .size--;
096:                    node.setPreviousObjectSinkNode(null);
097:                    node.setNextObjectSinkNode(null);
098:
099:                } else {
100:                    if (this .firstNode == node) {
101:                        removeFirst();
102:                    } else if (this .lastNode == node) {
103:                        removeLast();
104:                    }
105:                }
106:            }
107:
108:            /**
109:             * Return the first node in the list
110:             * @return
111:             *      The first <code>ObjectSinkNode</code>.
112:             */
113:            public final ObjectSinkNode getFirst() {
114:                return this .firstNode;
115:            }
116:
117:            /**
118:             * Return the last node in the list
119:             * @return
120:             *      The last <code>ObjectSinkNode</code>.
121:             */
122:            public final ObjectSinkNode getLast() {
123:                return this .lastNode;
124:            }
125:
126:            /**
127:             * Remove the first node from the list. The next node then becomes the first node. If this is the last 
128:             * node then both first and last node references are set to null.
129:             * 
130:             * @return
131:             *      The first <code>ObjectSinkNode</code>.
132:             */
133:            public ObjectSinkNode removeFirst() {
134:                if (this .firstNode == null) {
135:                    return null;
136:                }
137:                final ObjectSinkNode node = this .firstNode;
138:                this .firstNode = node.getNextObjectSinkNode();
139:                node.setNextObjectSinkNode(null);
140:                if (this .firstNode != null) {
141:                    this .firstNode.setPreviousObjectSinkNode(null);
142:                } else {
143:                    this .lastNode = null;
144:                }
145:                this .size--;
146:                return node;
147:            }
148:
149:            /**
150:             * Remove the last node from the list. The previous node then becomes the last node. If this is the last 
151:             * node then both first and last node references are set to null.
152:             * 
153:             * @return
154:             *      The first <code>ObjectSinkNode</code>.
155:             */
156:            public ObjectSinkNode removeLast() {
157:                if (this .lastNode == null) {
158:                    return null;
159:                }
160:                final ObjectSinkNode node = this .lastNode;
161:                this .lastNode = node.getPreviousObjectSinkNode();
162:                node.setPreviousObjectSinkNode(null);
163:                if (this .lastNode != null) {
164:                    this .lastNode.setNextObjectSinkNode(null);
165:                } else {
166:                    this .firstNode = this .lastNode;
167:                }
168:                this .size--;
169:                return node;
170:            }
171:
172:            /**
173:             * @return
174:             *      boolean value indicating the empty status of the list
175:             */
176:            public final boolean isEmpty() {
177:                return (this .firstNode == null);
178:            }
179:
180:            /**
181:             * Iterates the list removing all the nodes until there are no more nodes to remove. 
182:             */
183:            public void clear() {
184:                while (removeFirst() != null) {
185:                }
186:            }
187:
188:            /**
189:             * @return
190:             *     return size of the list as an int
191:             */
192:            public final int size() {
193:                return this .size;
194:            }
195:
196:            /**
197:             * Returns a list iterator
198:             * @return
199:             */
200:            public Iterator iterator() {
201:                return new Iterator() {
202:                    private ObjectSinkNode currentNode = null;
203:                    private ObjectSinkNode nextNode = getFirst();
204:
205:                    public boolean hasNext() {
206:                        return (this .nextNode != null);
207:                    }
208:
209:                    public Object next() {
210:                        this .currentNode = this .nextNode;
211:                        if (this .currentNode != null) {
212:                            this .nextNode = this .currentNode
213:                                    .getNextObjectSinkNode();
214:                        } else {
215:                            throw new NoSuchElementException(
216:                                    "No more elements to return");
217:                        }
218:                        return this .currentNode;
219:                    }
220:
221:                    public void remove() {
222:                        if (this .currentNode != null) {
223:                            ObjectSinkNodeList.this .remove(this .currentNode);
224:                            this .currentNode = null;
225:                        } else {
226:                            throw new IllegalStateException(
227:                                    "No item to remove. Call next() before calling remove().");
228:                        }
229:                    }
230:                };
231:            }
232:
233:        }
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