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.relaxng.RelaxException;
032: import com.caucho.util.L10N;
033: import com.caucho.xml.QName;
034:
035: import java.util.HashSet;
036: import java.util.Iterator;
037:
038: /**
039: * Generates programs from patterns.
040: */
041: public class ZeroOrMoreItem extends Item {
042: protected final static L10N L = new L10N(ZeroOrMoreItem.class);
043:
044: private Item _item;
045:
046: public ZeroOrMoreItem(Item item) {
047: _item = item;
048: }
049:
050: /**
051: * Returns the item.
052: */
053: public Item getItem() {
054: return _item;
055: }
056:
057: /**
058: * Returns the first set, the set of element names possible.
059: */
060: public void firstSet(HashSet<QName> set) {
061: _item.firstSet(set);
062: }
063:
064: /**
065: * Returns the first set, the set of element names possible.
066: */
067: public void requiredFirstSet(HashSet<QName> set) {
068: }
069:
070: /**
071: * The element always allows
072: */
073: public boolean allowEmpty() {
074: return true;
075: }
076:
077: /**
078: * Return all possible child items or null
079: */
080: public Iterator<Item> getItemsIterator() {
081: return itemIterator(_item);
082: }
083:
084: /**
085: * Returns the next item on the match.
086: *
087: * @param name the name of the element
088: * @param contItem the continuation item
089: */
090: public Item startElement(QName name) throws RelaxException {
091: Item next = _item.startElement(name);
092:
093: if (next == null)
094: return null;
095: else
096: return next.groupContinuation(this );
097: }
098:
099: /**
100: * Returns the first set, the set of attribute names possible.
101: */
102: public void attributeSet(HashSet<QName> set) {
103: _item.attributeSet(set);
104: }
105:
106: /**
107: * Returns true if the attribute is allowed.
108: *
109: * @param name the name of the attribute
110: * @param value the value of the attribute
111: *
112: * @return true if the attribute is allowed
113: */
114: public boolean allowAttribute(QName name, String value)
115: throws RelaxException {
116: return _item.allowAttribute(name, value);
117: }
118:
119: /**
120: * Returns true if the element is allowed somewhere in the item.
121: * allowsElement is used for error messages to give more information
122: * in cases of order dependency.
123: *
124: * @param name the name of the element
125: *
126: * @return true if the element is allowed somewhere
127: */
128: public boolean allowsElement(QName name) {
129: return _item.allowsElement(name);
130: }
131:
132: /**
133: * Returns the pretty printed syntax.
134: */
135: public String toSyntaxDescription(int depth) {
136: return _item.toSyntaxDescription(depth) + "*";
137: }
138:
139: /**
140: * Returns true for an element with simple syntax.
141: */
142: protected boolean isSimpleSyntax() {
143: return _item.isSimpleSyntax();
144: }
145:
146: /**
147: * Returns the hash code for the empty item.
148: */
149: public int hashCode() {
150: return 17 + _item.hashCode();
151: }
152:
153: /**
154: * Returns true if the object is an empty item.
155: */
156: public boolean equals(Object o) {
157: if (this == o)
158: return true;
159:
160: if (!(o instanceof ZeroOrMoreItem))
161: return false;
162:
163: ZeroOrMoreItem item = (ZeroOrMoreItem) o;
164:
165: return _item.equals(item._item);
166: }
167:
168: public String toString() {
169: return "ZeroOrMoreItem[" + _item + "]";
170: }
171: }
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