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.pattern;
030:
031: import com.caucho.relaxng.RelaxException;
032: import com.caucho.relaxng.program.Item;
033:
034: /**
035: * Relax reference pattern
036: */
037: public class RefPattern extends Pattern {
038: private GrammarPattern _grammar;
039:
040: private String _refName;
041:
042: /**
043: * Creates a new element pattern.
044: */
045: public RefPattern(GrammarPattern grammar, String refName) {
046: _grammar = grammar;
047:
048: _refName = refName;
049: }
050:
051: /**
052: * Returns the Relax schema name.
053: */
054: public String getTagName() {
055: return "ref";
056: }
057:
058: /**
059: * Returns the definition name.
060: */
061: public String getRefName() {
062: return _refName;
063: }
064:
065: /**
066: * Creates the item.
067: */
068: public Item createItem(GrammarPattern grammar)
069: throws RelaxException {
070: Pattern pattern = grammar.getDefinition(_refName);
071:
072: if (pattern == null) {
073: // XXX: line #
074: throw error(L.l(
075: "<ref name=\"{0}\"/> is an unknown reference.",
076: _refName));
077: }
078:
079: for (Pattern ptr = this ; ptr != null
080: && !(ptr instanceof ElementPattern); ptr = ptr
081: .getParent()) {
082: if (ptr == pattern) {
083: throw error(L
084: .l(
085: "<define name=\"{0}\"/> calls itself recursively in a <ref/>.",
086: _refName));
087: }
088: }
089:
090: return pattern.createItem(grammar);
091: }
092:
093: /**
094: * Returns a string for the production.
095: */
096: public String toProduction() {
097: Pattern pattern = _grammar.getDefinition(_refName);
098:
099: return pattern.toProduction();
100: }
101:
102: /**
103: * Returns true if the pattern equals.
104: */
105: public boolean equals(Object o) {
106: if (this == o)
107: return true;
108:
109: if (!(o instanceof Pattern))
110: return false;
111:
112: return o.equals(_grammar.getDefinition(_refName));
113: }
114:
115: /**
116: * Debugging.
117: */
118: public String toString() {
119: return "RefPattern[" + _refName + "]";
120: }
121: }
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