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 Software Foundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Rodrigo Westrupp
027: */
028:
029: package com.caucho.amber.expr;
030:
031: import com.caucho.amber.field.AmberField;
032: import com.caucho.amber.query.FromItem;
033: import com.caucho.amber.query.QueryParseException;
034: import com.caucho.amber.query.QueryParser;
035: import com.caucho.amber.type.RelatedType;
036: import com.caucho.util.L10N;
037:
038: /**
039: * Represents an association from a from-item table.
040: */
041: public class OneToOneSchemaExpr extends SchemaExpr {
042: private static final L10N L = new L10N(OneToOneSchemaExpr.class);
043:
044: private DependentEntityOneToOneExpr _expr;
045: private String _name;
046:
047: /**
048: * Creates the association schema.
049: */
050: public OneToOneSchemaExpr(DependentEntityOneToOneExpr expr,
051: String name) {
052: _expr = expr;
053: _name = name;
054: }
055:
056: /**
057: * Returns the tail name.
058: */
059: public String getTailName() {
060: return _name;
061: }
062:
063: /**
064: * Creates a field-based schema.
065: */
066: public SchemaExpr createField(QueryParser parser, String name)
067: throws QueryParseException {
068: RelatedType type = _expr.getTargetType();
069:
070: AmberField field = type.getField(name);
071:
072: if (field == null)
073: throw parser.error(L.l("{0}: '{1}' is an unknown field.",
074: type.getBeanClass().getName(), name));
075:
076: AmberExpr fieldExpr = _expr.createField(parser, name);
077:
078: if (fieldExpr instanceof ManyToOneExpr)
079: return new ManyToOneSchemaExpr((ManyToOneExpr) fieldExpr,
080: name);
081:
082: if (fieldExpr instanceof DependentEntityOneToOneExpr)
083: return new OneToOneSchemaExpr(
084: (DependentEntityOneToOneExpr) fieldExpr, name);
085:
086: throw parser
087: .error(L
088: .l(
089: "{0}: '{1}' must be a collection or one-to-one relationship.",
090: type.getBeanClass().getName(), name));
091: }
092:
093: /**
094: * Adds the from item.
095: */
096: public FromItem addFromItem(QueryParser parser, String id)
097: throws QueryParseException {
098: _expr = (DependentEntityOneToOneExpr) _expr.bindSelect(parser,
099: id);
100:
101: FromItem fromItem = _expr.bindSubPath(parser);
102:
103: return fromItem;
104: }
105: }
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