Source Code Cross Referenced for PathExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » ejb » ql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.ejb.ql 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.ejb.ql;
030:
031:        import com.caucho.amber.field.IdField;
032:        import com.caucho.amber.type.EntityType;
033:        import com.caucho.config.ConfigException;
034:        import com.caucho.ejb.cfg21.CmpField;
035:        import com.caucho.ejb.cfg21.CmrRelation;
036:        import com.caucho.ejb.cfg21.EjbEntityBean;
037:        import com.caucho.util.CharBuffer;
038:
039:        import java.util.ArrayList;
040:        import java.util.Collections;
041:
042:        /**
043:         * Generated expression a relation path.
044:         *
045:         * tableA.x = tableB.y
046:         */
047:        abstract class PathExpr extends Expr {
048:            protected EjbEntityBean _bean;
049:
050:            PathExpr(EjbEntityBean bean) {
051:                _bean = bean;
052:
053:                setJavaType(bean.getEJBClass());
054:            }
055:
056:            /**
057:             * Returns the bean.
058:             */
059:            EjbEntityBean getBean() {
060:                return _bean;
061:            }
062:
063:            /**
064:             * Gets the Java Type of the expression.
065:             */
066:            /*
067:            public Class getJavaType()
068:            {
069:              return _bean.getLocal();
070:            }
071:             */
072:
073:            /**
074:             * Create field
075:             */
076:            Expr newField(String fieldName) throws ConfigException {
077:                CmpField field = _bean.getCmpField(fieldName);
078:
079:                if (field != null)
080:                    return new FieldExpr(_query, this , fieldName, field);
081:
082:                CmrRelation relation = _bean.getRelation(fieldName);
083:
084:                if (relation == null)
085:                    throw error(L.l("{0}: '{1}' is an unknown cmp-field.",
086:                            _bean.getEJBClass().getName(), fieldName));
087:
088:                // _query.getPersistentBean().addBeanDepend(relation.getTargetBean().getName());
089:
090:                if (relation.isCollection())
091:                    return new CollectionExpr(_query, this , fieldName, relation);
092:                else
093:                    return new RelationExpr(_query, this , fieldName, relation);
094:            }
095:
096:            abstract String getKeyTable();
097:
098:            abstract String[] getKeyFields();
099:
100:            abstract String getTable();
101:
102:            int getComponentCount() {
103:                return getKeyFields().length;
104:            }
105:
106:            void setUsesField() {
107:            }
108:
109:            protected String generateKeyField(EntityType type, int index) {
110:                ArrayList<String> names = generateKeyFields(type);
111:
112:                return names.get(index);
113:            }
114:
115:            protected ArrayList<String> generateKeyFields(EntityType type) {
116:                ArrayList<String> names = new ArrayList<String>();
117:
118:                for (IdField key : type.getId().getKeys()) {
119:                    String name = key.getName();
120:
121:                    if (key.getType() instanceof  EntityType) {
122:                        ArrayList<String> subNames;
123:                        subNames = generateKeyFields((EntityType) key.getType());
124:
125:                        for (String subName : subNames) {
126:                            names.add(name + '.' + subName);
127:                        }
128:                    } else
129:                        names.add(name);
130:                }
131:
132:                Collections.sort(names);
133:
134:                return names;
135:            }
136:
137:            void generateAmber(CharBuffer cb) {
138:                throw new UnsupportedOperationException(getClass().getName());
139:            }
140:        }
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