Source Code Cross Referenced for LOBConstantNode.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » sql » compile » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.sql.compile 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.sql.compile.LOBConstantNode
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.impl.sql.compile;
023:
024:        import org.apache.derby.iapi.types.StringDataValue;
025:        import org.apache.derby.iapi.types.TypeId;
026:
027:        import org.apache.derby.iapi.error.StandardException;
028:
029:        import org.apache.derby.iapi.services.compiler.MethodBuilder;
030:
031:        import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;
032:        import org.apache.derby.iapi.reference.SQLState;
033:
034:        import org.apache.derby.iapi.util.ReuseFactory;
035:
036:        import java.sql.Types;
037:
038:        public final class LOBConstantNode extends ConstantNode {
039:            /**
040:             * Initializer for a LOBConstantNode. Parameters are:
041:             *
042:             * <ul>
043:             * <li>arg1	The TypeId for the type of the node, or a string?</li>
044:             * </ul>
045:             *
046:             * <p>
047:             * - OR -
048:             * </p>
049:             *
050:             * <ul>
051:             * <li>arg1	A String containing the value of the constant</li>
052:             * <li>arg2	The factory to get the TypeId and DataTypeServices factories from.</li>
053:             * </ul>
054:             *
055:             * @exception StandardException
056:             */
057:            public void init(Object arg1) throws StandardException {
058:                if (arg1 instanceof  TypeId) {
059:                    super .init(arg1, Boolean.TRUE, ReuseFactory.getInteger(0));
060:                } else {
061:                    String val = (String) arg1;
062:
063:                    super .init(TypeId.CHAR_ID, (val == null) ? Boolean.TRUE
064:                            : Boolean.FALSE, (val != null) ? ReuseFactory
065:                            .getInteger(val.length()) : ReuseFactory
066:                            .getInteger(0));
067:
068:                    setValue(getDataValueFactory().getCharDataValue(val));
069:                }
070:            }
071:
072:            public void init(Object newValue, Object newLength)
073:                    throws StandardException {
074:                String val = (String) newValue;
075:                int newLen = ((Integer) newLength).intValue();
076:
077:                super .init(TypeId.CHAR_ID, (val == null) ? Boolean.TRUE
078:                        : Boolean.FALSE, newLength);
079:
080:                if (val.length() > newLen) {
081:                    throw StandardException.newException(
082:                            SQLState.LANG_STRING_TRUNCATION, "CHAR", val,
083:                            String.valueOf(newLen));
084:                }
085:
086:                // Blank pad the string if necessesary
087:                while (val.length() < newLen) {
088:                    val = val + ' ';
089:                }
090:
091:                setValue(getDataValueFactory().getCharDataValue(val));
092:            }
093:
094:            /**
095:             * Return the value from this LOBConstantNode
096:             *
097:             * @return	The value of this LOBConstantNode.
098:             *
099:             * @exception StandardException		Thrown on error
100:             */
101:
102:            public String getString() throws StandardException {
103:                return value.getString();
104:            }
105:
106:            /**
107:             * Return the length
108:             *
109:             * @return	The length of the value this node represents
110:             *
111:             * @exception StandardException		Thrown on error
112:             */
113:
114:            //public int	getLength() throws StandardException
115:            //{
116:            //	return value.getLength();
117:            //}
118:            /**
119:             * Return an Object representing the bind time value of this
120:             * expression tree.  If the expression tree does not evaluate to
121:             * a constant at bind time then we return null.
122:             * This is useful for bind time resolution of VTIs.
123:             * RESOLVE: What do we do for primitives?
124:             *
125:             * @return	An Object representing the bind time value of this expression tree.
126:             *			(null if not a bind time constant.)
127:             *
128:             * @exception StandardException		Thrown on error
129:             */
130:            Object getConstantValueAsObject() throws StandardException {
131:                return value.getString();
132:            }
133:
134:            /**
135:             * This generates the proper constant.  It is implemented
136:             * by every specific constant node (e.g. IntConstantNode).
137:             *
138:             * @param acb	The ExpressionClassBuilder for the class being built
139:             * @param mb	The method the code to place the code
140:             *
141:             * @exception StandardException		Thrown on error
142:             */
143:            void generateConstant(ExpressionClassBuilder acb, MethodBuilder mb)
144:                    throws StandardException {
145:                // The generated java is the expression:
146:                // "#getString()"
147:                mb.push(getString());
148:            }
149:        }
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