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 Scott Ferguson
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 a collection from a from-item table.
040: */
041: public class ManyToOneSchemaExpr extends SchemaExpr {
042: private static final L10N L = new L10N(CollectionSchemaExpr.class);
043:
044: private ManyToOneExpr _expr;
045: private String _name;
046:
047: /**
048: * Creates the collection schema.
049: */
050: public ManyToOneSchemaExpr(ManyToOneExpr expr, String name) {
051: _expr = expr;
052: _name = name;
053: }
054:
055: /**
056: * Returns the tail name.
057: */
058: public String getTailName() {
059: return _name;
060: }
061:
062: /**
063: * Creates a field-based schema.
064: */
065: public SchemaExpr createField(QueryParser parser, String name)
066: throws QueryParseException {
067: RelatedType type = _expr.getTargetType();
068:
069: AmberField field = type.getField(name);
070:
071: if (field == null)
072: throw parser.error(L.l("{0}: '{1}' is an unknown field.",
073: type.getBeanClass().getName(), name));
074:
075: AmberExpr fieldExpr = _expr.createField(parser, name);
076:
077: if (fieldExpr instanceof ManyToOneExpr)
078: return new ManyToOneSchemaExpr((ManyToOneExpr) fieldExpr,
079: name);
080: /*
081: else if (fieldExpr instanceof ManyToManyExpr)
082: return new ManyToManySchemaExpr((ManyToManyExpr) fieldExpr);
083: */
084: else if (fieldExpr instanceof OneToManyExpr)
085: return new OneToManySchemaExpr((OneToManyExpr) fieldExpr);
086: throw parser.error(L.l("{0}: '{1}' must be a collection.", type
087: .getBeanClass().getName(), name));
088: }
089:
090: /**
091: * Adds the from item.
092: */
093: public FromItem addFromItem(QueryParser parser, String id)
094: throws QueryParseException {
095: _expr = (ManyToOneExpr) _expr.bindSelect(parser, id);
096:
097: FromItem fromItem = _expr.bindSubPath(parser);
098:
099: return fromItem;
100: }
101: }
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