Source Code Cross Referenced for MapValueLiteral.java in  » Database-ORM » JPOX » org » jpox » store » expression » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » JPOX » org.jpox.store.expression 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**********************************************************************
002:        Copyright (c) 2004 Andy Jefferson and others. All rights reserved.
003:        Licensed under the Apache License, Version 2.0 (the "License");
004:        you may not use this file except in compliance with the License.
005:        You may obtain a copy of the License at
006:
007:            http://www.apache.org/licenses/LICENSE-2.0
008:
009:        Unless required by applicable law or agreed to in writing, software
010:        distributed under the License is distributed on an "AS IS" BASIS,
011:        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        See the License for the specific language governing permissions and
013:        limitations under the License.
014:
015:        Contributors:
016:            ...
017:         **********************************************************************/package org.jpox.store.expression;
018:
019:        import java.util.ArrayList;
020:        import java.util.Collection;
021:        import java.util.Iterator;
022:        import java.util.List;
023:        import java.util.Map;
024:
025:        import org.jpox.store.DatastoreAdapter;
026:        import org.jpox.store.mapping.JavaTypeMapping;
027:
028:        /**
029:         * An SQL expression that will test if a column of a table falls within the
030:         * given Map's values.  This is used for Querys where a transient Map is passed
031:         * in as a parameter.
032:         *
033:         * @version $Revision: 1.11 $
034:         */
035:        public class MapValueLiteral extends ScalarExpression {
036:            private final boolean isEmpty;
037:            private final boolean containsNull;
038:            private final DatastoreAdapter dba;
039:            /** ScalarExpressions for all elements in the Map **/
040:            private List scalarExpressions;
041:
042:            /**
043:             * Constructor.
044:             * @param qs  The QueryStatement the MapValueLiteral will be used in.
045:             * @param mapping The mapping to the Map
046:             * @param map The transient Map that is the value.
047:             */
048:            public MapValueLiteral(QueryExpression qs, JavaTypeMapping mapping,
049:                    Map map) {
050:                super (qs);
051:                this .mapping = mapping;
052:                containsNull = (map != null) && map.containsValue(null);
053:                dba = qs.getStoreManager().getDatastoreAdapter();
054:
055:                // We'll consider the Map to be empty if it is null, is really
056:                // empty, or only contains null. 
057:                // If it contains null we need a special case when creating the SQL.
058:                isEmpty = (map == null) || (map.isEmpty())
059:                        || (map.size() == 1 && containsNull);
060:
061:                // If the Map is empty, don't build the list of SQLExpressions.
062:                if (!isEmpty) {
063:                    scalarExpressions = new ArrayList();
064:                    st.append("(");
065:
066:                    boolean hadPrev = false;
067:
068:                    Collection values = map.values();
069:                    for (Iterator it = values.iterator(); it.hasNext();) {
070:                        Object current = it.next();
071:                        if (null != current) {
072:                            JavaTypeMapping m = dba.getMapping(current
073:                                    .getClass(), qs.getStoreManager(), qs
074:                                    .getClassLoaderResolver());
075:                            ScalarExpression expr = m.newLiteral(qs, current);
076:
077:                            // Append the SQLExpression (should be a literal) for the
078:                            // current element.
079:                            st.append(hadPrev ? "," : "");
080:                            st.append(expr);
081:                            scalarExpressions.add(expr);
082:
083:                            hadPrev = true;
084:                        }
085:                    }
086:
087:                    st.append(")");
088:                }
089:            }
090:
091:            /**
092:             * Method to check the containing of a key in the Map.
093:             * Return the BooleanExpression that results from 
094:             * MapValueLiteral.contains(SQLExpression).
095:             * @param expr The SQLExpression that is checked for membership in the Map.
096:             * @return The BooleanExpression that results from 
097:             *         MapValueLiteral.contains(SQLExpression).
098:             */
099:            public BooleanExpression containsMethod(ScalarExpression expr) {
100:                if (isEmpty) {
101:                    return new BooleanLiteral(qs, mapping, false);
102:                }
103:                BooleanExpression bExpr = null;
104:                for (int i = 0; i < scalarExpressions.size(); i++) {
105:                    if (bExpr == null) {
106:                        bExpr = ((ScalarExpression) scalarExpressions.get(i))
107:                                .eq(expr);
108:                    } else {
109:                        bExpr = bExpr.ior(((ScalarExpression) scalarExpressions
110:                                .get(i)).eq(expr));
111:                    }
112:                }
113:                bExpr.encloseWithInParentheses();
114:                return bExpr;
115:            }
116:
117:            /**
118:             * Method to check for emptiness of the collection.
119:             * @return The BooleanExpression.
120:             **/
121:            public BooleanExpression isEmptyMethod() {
122:                return new BooleanLiteral(qs, mapping, isEmpty);
123:            }
124:        }
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