001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.relaxng.program;
030:
031: import com.caucho.log.Log;
032: import com.caucho.relaxng.RelaxException;
033: import com.caucho.util.L10N;
034: import com.caucho.util.LruCache;
035: import com.caucho.xml.QName;
036:
037: import java.util.HashSet;
038: import java.util.Iterator;
039: import java.util.logging.Logger;
040:
041: /**
042: * Generates programs from patterns.
043: */
044: public class MemoItem extends Item {
045: protected final static L10N L = new L10N(MemoItem.class);
046: protected final static Logger log = Log.open(MemoItem.class);
047:
048: private LruCache<Object, Item> _memoMap;
049: private Item _item;
050:
051: public MemoItem(Item item, LruCache<Object, Item> memoMap) {
052: _item = item;
053: _memoMap = memoMap;
054: }
055:
056: public MemoItem(Item item) {
057: _item = item;
058: _memoMap = new LruCache<Object, Item>(256);
059: }
060:
061: /**
062: * Adds to the first set, the set of element names possible.
063: */
064: public void firstSet(HashSet<QName> set) {
065: _item.firstSet(set);
066: }
067:
068: /**
069: * Adds to the first set, the set of element names possible.
070: */
071: public void requiredFirstSet(HashSet<QName> set) {
072: _item.requiredFirstSet(set);
073: }
074:
075: /**
076: * Returns true if the item can match empty.
077: */
078: public boolean allowEmpty() {
079: return _item.allowEmpty();
080: }
081:
082: /**
083: * Return all possible child items or null
084: */
085: public Iterator<Item> getItemsIterator() {
086: return itemIterator(_item);
087: }
088:
089: /**
090: * Returns the next item when an element of the given name is returned
091: *
092: * @param name the name of the element
093: *
094: * @return the program for handling the element
095: */
096: public Item startElement(QName name) throws RelaxException {
097: Item item = _item.startElement(name);
098:
099: if (item == null)
100: return null;
101: else if (item == this )
102: return this ;
103: else
104: return new MemoItem(item, _memoMap);
105: }
106:
107: /**
108: * Adds to the first set, the set of attribute names possible.
109: */
110: public void attributeSet(HashSet<QName> set) {
111: _item.attributeSet(set);
112: }
113:
114: /**
115: * Sets an attribute.
116: *
117: * @param name the name of the attribute
118: * @param value the value of the attribute
119: *
120: * @return the program for handling the element
121: */
122: public boolean allowAttribute(QName name, String value)
123: throws RelaxException {
124: return _item.allowAttribute(name, value);
125: }
126:
127: /**
128: * Sets an attribute.
129: *
130: * @param name the name of the attribute
131: * @param value the value of the attribute
132: *
133: * @return the program for handling the element
134: */
135: public Item setAttribute(QName name, String value)
136: throws RelaxException {
137: Item item = _item.setAttribute(name, value);
138:
139: if (item == null)
140: return null;
141: else if (item == this )
142: return this ;
143: else
144: return new MemoItem(item, _memoMap);
145: }
146:
147: /**
148: * Returns true if the item can match empty.
149: */
150: public Item attributeEnd() {
151: Item item = _item.attributeEnd();
152:
153: if (item == null)
154: return null;
155: else if (item == this )
156: return this ;
157: else
158: return new MemoItem(item, _memoMap);
159: }
160:
161: /**
162: * Adds text.
163: */
164: @Override
165: public Item text(CharSequence text) throws RelaxException {
166: Item item = _item.text(text);
167:
168: if (item == null)
169: return null;
170: else if (item == this )
171: return this ;
172: else
173: return new MemoItem(item, _memoMap);
174: }
175:
176: /**
177: * Returns the next item when the element closes
178: */
179: public Item endElement() throws RelaxException {
180: Item item = _item.endElement();
181:
182: if (item == null)
183: return null;
184: else if (item == this )
185: return this ;
186: else
187: return new MemoItem(item, _memoMap);
188: }
189: }
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