Source Code Cross Referenced for Item.java in  » Parser » Rats-Parser-Generators » xtc » xform » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » Rats Parser Generators » xtc.xform 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * xtc - The eXTensible Compiler
003:         * Copyright (C) 2005-2007 New York University
004:         *
005:         * This program is free software; you can redistribute it and/or
006:         * modify it under the terms of the GNU General Public License
007:         * version 2 as published by the Free Software Foundation.
008:         *
009:         * This program is distributed in the hope that it will be useful,
010:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
011:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:         * GNU General Public License for more details.
013:         *
014:         * You should have received a copy of the GNU General Public License
015:         * along with this program; if not, write to the Free Software
016:         * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
017:         * USA.
018:         */
019:
020:        package xtc.xform;
021:
022:        import java.util.Iterator;
023:        import java.util.LinkedList;
024:        import java.util.List;
025:
026:        /**
027:         * A tree item contained in a sequence.
028:         *
029:         * @author Joe Pamer
030:         * @version $Revision: 1.18 $
031:         */
032:        public class Item {
033:            /** The tree item object. */
034:            Object object;
035:
036:            /** The tree item's parent. */
037:            Item parent;
038:
039:            /** The item's child index in the parent item. */
040:            int index;
041:
042:            /** The children of this item */
043:            List<Item> children;
044:
045:            /**
046:             * Create a new item.
047:             *
048:             */
049:            public Item() {
050:                object = null;
051:                parent = null;
052:                children = null;
053:                index = 0;
054:            }
055:
056:            /**
057:             * Create a new item.
058:             *
059:             * @param object The item object.
060:             * @param parent The item's parent.
061:             * @param index The item's child index.
062:             */
063:            public Item(Object object, Item parent, int index) {
064:                this .object = object;
065:                this .parent = parent;
066:                this .index = index;
067:                this .children = null;
068:            }
069:
070:            /**
071:             * Create a new item.
072:             *
073:             * @param object The item object.
074:             * @param parent The item's parent.
075:             * @param index The item's child index.
076:             * @param children The item's child items.
077:             */
078:            public Item(Object object, Item parent, int index,
079:                    List<Item> children) {
080:                this .object = object;
081:                this .parent = parent;
082:                this .index = index;
083:                addChildren(children);
084:            }
085:
086:            /**
087:             * Create a new that is a copy of an existing item.
088:             *
089:             * @param i The item object.
090:             */
091:            public Item(Item i) {
092:                this .object = i.object;
093:                this .parent = i.parent;
094:                this .index = i.index;
095:                addChildren(i.children);
096:            }
097:
098:            /**
099:             * Get the item's object.
100:             *
101:             * @return The item's object.
102:             */
103:            public Object getObject() {
104:                return this .object;
105:            }
106:
107:            /**
108:             * Get the item's parent.
109:             *
110:             * @return The item's parent item.
111:             */
112:            public Item getParent() {
113:                return this .parent;
114:            }
115:
116:            /**
117:             * Get the item's index.
118:             *
119:             * @return The item's index.
120:             */
121:            public int getIndex() {
122:                return this .index;
123:            }
124:
125:            /**
126:             * Get the item's children.
127:             *
128:             * @return The item's children.
129:             */
130:            public List<Item> getChildren() {
131:                return this .children;
132:            }
133:
134:            /**
135:             * Test for equality.
136:             *
137:             * @param o The object to test for equality.
138:             * @return True if o is equal, false otherwise.
139:             */
140:            public boolean equals(Object o) {
141:                if (o instanceof  Item) {
142:                    Item other = (Item) o;
143:                    if ((this .object == other.object)
144:                            && (this .parent == other.parent)
145:                            && (this .index == other.index)) {
146:                        return true;
147:                    } else {
148:                        return false;
149:                    }
150:                } else {
151:                    return false;
152:                }
153:            }
154:
155:            /**
156:             * Add a new child to the item.
157:             *
158:             * @param child The new child item.
159:             */
160:            public void addChild(Item child) {
161:                if (null == this .children) {
162:                    this .children = new LinkedList<Item>();
163:                }
164:
165:                child.parent = this ;
166:                child.index = this .children.size();
167:
168:                this .children.add(child);
169:            }
170:
171:            /**
172:             * Add a new child at the specified index.
173:             * 
174:             * @param child The new child item.
175:             * @param index The index.
176:             */
177:            public void addChild(Item child, int index) {
178:                if (null == this .children) {
179:                    if (0 == index) {
180:                        this .children = new LinkedList<Item>();
181:                    } else {
182:                        throw new RuntimeException(
183:                                "Error: Attempted to add first child at "
184:                                        + "index greater than 0.");
185:                    }
186:                }
187:                child.parent = this ;
188:                child.index = index;
189:
190:                this .children.add(index, child);
191:
192:                // adjust the other children's indices
193:                for (int newidx = index + 1; newidx < this .children.size(); newidx++) {
194:                    (this .children.get(newidx)).index = newidx;
195:                }
196:            }
197:
198:            /**
199:             * Add a collection of new children to an item.
200:             *
201:             * @param children The new children.
202:             */
203:            public void addChildren(List<Item> children) {
204:                if (null == children) {
205:                    return;
206:                } else if (null == this .children) {
207:                    this .children = new LinkedList<Item>();
208:                }
209:
210:                int index = this .children.size();
211:
212:                for (Iterator<Item> child_iterator = children.iterator(); child_iterator
213:                        .hasNext(); index++) {
214:                    Item child_item = child_iterator.next();
215:                    child_item.index = index;
216:                    child_item.parent = this ;
217:                    this .children.add(child_item);
218:                }
219:            }
220:
221:            /** 
222:             * Insert a collection of new children at the specified index.
223:             *
224:             * @param children The children to insert.
225:             * @param index The index to insert at.
226:             */
227:            public void addChildren(List<Item> children, int index) {
228:                if (null == this .children) {
229:                    if (0 == index) {
230:                        this .children = new LinkedList<Item>();
231:                    } else {
232:                        throw new RuntimeException(
233:                                "Error: Attempted to add first children at"
234:                                        + " an index greater than 0.");
235:                    }
236:                }
237:
238:                int insert_index = index;
239:
240:                for (Iterator<Item> child_iterator = children.iterator(); child_iterator
241:                        .hasNext(); index++) {
242:
243:                    Item child_item = child_iterator.next();
244:                    child_item.parent = this ;
245:                    child_item.index = index;
246:                }
247:
248:                this .children.addAll(insert_index, children);
249:
250:                // adjust old children's indices
251:                while (index < this .children.size()) {
252:                    (this .children.get(index)).index = index;
253:                    index++;
254:                }
255:            }
256:
257:            /**
258:             * Remove the child at the specified index.
259:             *
260:             * @param index The index of the child to eliminate.
261:             */
262:            public void removeChild(int index) {
263:                this .children.remove(index);
264:
265:                // adjust the indices of the remaining children
266:                while (index < this .children.size()) {
267:                    (this .children.get(index)).index = index;
268:                    index++;
269:                }
270:            }
271:
272:            /**
273:             * Replace the item at the specified index with the given item.
274:             *
275:             * @param index The index of the child to be replaced.
276:             * @param item The item to make the replacement with.
277:             */
278:            public void replaceChild(int index, Item item) {
279:                item.parent = this ;
280:                item.index = index;
281:
282:                this .children.set(index, item);
283:            }
284:
285:            /**
286:             * Replace the item at the specified index with the given list of items.
287:             *
288:             * @param index The index of the child to be replaced.
289:             * @param items The items to make the replacement with.
290:             */
291:            public void replaceChild(int index, List<Item> items) {
292:                removeChild(index);
293:                addChildren(items, index);
294:            }
295:
296:            /**
297:             * Add to a list (only if it's not already a member of the list).
298:             *
299:             * @param list The list to be added to.
300:             * @return The potentially modified list.
301:             */
302:            public List<Object> addToList(List<Object> list) {
303:                if (!list.contains(this )) {
304:                    list.add(this );
305:                }
306:                return list;
307:            }
308:
309:            /**
310:             * Return the item as a string value.
311:             *
312:             * @return The item as a string.
313:             */
314:            public String toString() {
315:                if (null == this .object) {
316:                    return "null";
317:                } else if (this .object instanceof  String) {
318:                    return (String) this .object;
319:                } else {
320:                    return this .object.toString();
321:                }
322:            }
323:
324:        } // end class Item
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