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.AmberRuntimeException;
032: import com.caucho.amber.field.AmberField;
033: import com.caucho.amber.query.FromItem;
034: import com.caucho.amber.query.QueryParser;
035: import com.caucho.amber.type.AbstractStatefulType;
036: import com.caucho.amber.type.RelatedType;
037: import com.caucho.util.L10N;
038:
039: /**
040: * Represents an amber mapping query expression
041: */
042: abstract public class AbstractPathExpr extends AbstractAmberExpr
043: implements PathExpr {
044: private static final L10N L = new L10N(AbstractPathExpr.class);
045:
046: /**
047: * Creates the expr from the path.
048: */
049: public AmberExpr createField(QueryParser parser, String fieldName) {
050: AmberField field = null;
051:
052: AbstractStatefulType type = getTargetType();
053:
054: do {
055: field = type.getField(fieldName);
056:
057: if (type instanceof RelatedType)
058: type = ((RelatedType) type).getParentType();
059: else
060: // XXX
061: type = null;
062: } while ((type != null) && (field == null));
063:
064: if (field == null)
065: throw new AmberRuntimeException(
066: L
067: .l(
068: "'{0}' is an unknown field of '{1}' which has the following list of fields '{2}'",
069: fieldName, getTargetType()
070: .getName(), getTargetType()
071: .getFields()));
072:
073: return field.createExpr(parser, this );
074: }
075:
076: /**
077: * Creates an array reference.
078: */
079: public AmberExpr createArray(AmberExpr field) {
080: throw new UnsupportedOperationException(getClass().getName());
081: }
082:
083: /**
084: * Binds the expression as a select item.
085: */
086: public PathExpr bindSelect(QueryParser parser, String tableName) {
087: return this ;
088: }
089:
090: /**
091: * Binds the expression as a select item.
092: */
093: public FromItem bindSubPath(QueryParser parser) {
094: return null;
095: }
096:
097: /**
098: * Returns the from item
099: */
100: public FromItem getChildFromItem() {
101: throw new UnsupportedOperationException(getClass().getName());
102: }
103: }
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