Source Code Cross Referenced for NewObjectExpression.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) 2005 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:
016:        Contributors:
017:            ...
018:         **********************************************************************/package org.jpox.store.expression;
019:
020:        import java.lang.reflect.Constructor;
021:        import java.util.ArrayList;
022:        import java.util.Arrays;
023:        import java.util.Iterator;
024:        import java.util.List;
025:
026:        import org.jpox.exceptions.JPOXUserException;
027:        import org.jpox.store.mapping.OIDMapping;
028:        import org.jpox.util.ClassUtils;
029:
030:        /**
031:         * Representation of an expression "new MyObject(param1, param2)" as the result in a JDOQL query.
032:         * @version $Revision: 1.7 $
033:         */
034:        public class NewObjectExpression extends ScalarExpression {
035:            /** The class that we need to construct an instance of. */
036:            Class newClass = null;
037:
038:            /** The arguments to use in the constructor. */
039:            List ctrArgs = null;
040:
041:            final Constructor ctr;
042:
043:            /**
044:             * Constructor.
045:             * @param qs The query expression
046:             * @param cls The class to construct an instance of
047:             * @param args the constructor args
048:             */
049:            public NewObjectExpression(QueryExpression qs, Class cls, List args) {
050:                super (qs);
051:                this .newClass = cls;
052:                ctrArgs = new ArrayList(args);
053:
054:                // Check that this constructor exists before going any further
055:                Class[] ctrTypes = new Class[args.size()];
056:                for (int i = 0; i < args.size(); i++) {
057:                    if (((ScalarExpression) args.get(i)).getMapping() instanceof  OIDMapping) {
058:                        ctrTypes[i] = qs.getClassLoaderResolver().classForName(
059:                                ((OIDMapping) ((ScalarExpression) args.get(i))
060:                                        .getMapping()).getType());
061:                    } else if (args.get(i) instanceof  NewObjectExpression) {
062:                        ctrTypes[i] = ((NewObjectExpression) args.get(i))
063:                                .getNewClass();
064:                    } else {
065:                        ctrTypes[i] = ((ScalarExpression) args.get(i))
066:                                .getMapping().getJavaType();
067:                    }
068:                }
069:                ctr = ClassUtils
070:                        .getConstructorWithArguments(newClass, ctrTypes);
071:                if (ctr == null) {
072:                    throw new JPOXUserException(LOCALISER.msg("037013",
073:                            newClass.getName()
074:                                    + typeList(Arrays.asList(ctrTypes))));
075:                }
076:            }
077:
078:            private static String typeList(List exprs) {
079:                StringBuffer s = new StringBuffer("(");
080:                Iterator i = exprs.iterator();
081:
082:                while (i.hasNext()) {
083:                    s.append(i.next()).append(i.hasNext() ? ',' : ')');
084:                }
085:
086:                return s.toString();
087:            }
088:
089:            /**
090:             * Accessor for the class of which we should create a new instance.
091:             * @return The class
092:             */
093:            public Class getNewClass() {
094:                return newClass;
095:            }
096:
097:            /**
098:             * Accessor for the constructor argument expressions.
099:             * @return List of constructor argument expressions
100:             */
101:            public List getArgumentExpressions() {
102:                return ctrArgs;
103:            }
104:
105:            /**
106:             * Method to return the new object using the passed values for the arguments.
107:             * @param values The values of the arguments
108:             * @return The new object
109:             */
110:            public Object createNewObject(Object[] values) {
111:                if ((values == null || values.length == 0)
112:                        && ctrArgs.size() > 0) {
113:                    throw new JPOXUserException(LOCALISER.msg("037014", "0", ""
114:                            + ctrArgs.size()));
115:                }
116:                if (values.length != ctrArgs.size()) {
117:                    throw new JPOXUserException(LOCALISER.msg("037014", ""
118:                            + values.length, "" + ctrArgs.size()));
119:                }
120:
121:                Object obj = null;
122:                if (ctr != null) {
123:                    try {
124:                        obj = ctr.newInstance(values);
125:                    } catch (Exception e) {
126:                        throw new JPOXUserException(LOCALISER.msg("037015",
127:                                newClass.getName(), e));
128:                    }
129:                }
130:                return obj;
131:            }
132:        }
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