--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.compile.CharConstantNode\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.sql.compile;\r
+\r
+import org.apache.derby.iapi.types.StringDataValue;\r
+import org.apache.derby.iapi.types.TypeId;\r
+\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.services.compiler.MethodBuilder;\r
+\r
+import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;\r
+import org.apache.derby.iapi.reference.SQLState;\r
+\r
+import org.apache.derby.iapi.util.ReuseFactory;\r
+\r
+import java.util.Vector;\r
+\r
+public final class CharConstantNode extends ConstantNode\r
+{\r
+ /**\r
+ * Initializer for a CharConstantNode.\r
+ *\r
+ * @param arg1 A String containing the value of the constant OR The TypeId for the type of the node\r
+ *\r
+ * @exception StandardException\r
+ */\r
+ public void init(\r
+ Object arg1)\r
+ throws StandardException\r
+ {\r
+ if (arg1 instanceof TypeId)\r
+ {\r
+ super.init(\r
+ arg1,\r
+ Boolean.TRUE,\r
+ ReuseFactory.getInteger(0));\r
+ }\r
+ else\r
+ {\r
+ String val = (String) arg1;\r
+\r
+ super.init(\r
+ TypeId.CHAR_ID,\r
+ (val == null) ? Boolean.TRUE : Boolean.FALSE,\r
+ (val != null) ?\r
+ ReuseFactory.getInteger(val.length()) :\r
+ ReuseFactory.getInteger(0));\r
+\r
+ setValue(getDataValueFactory().getCharDataValue(val));\r
+ }\r
+ }\r
+\r
+ /**\r
+ * Initializer for a CharConstantNode of a specific length.\r
+ *\r
+ * @param newValue A String containing the value of the constant\r
+ * @param newLength The length of the new value of the constant\r
+ *\r
+ * @exception StandardException\r
+ */\r
+ public void init(\r
+ Object newValue, \r
+ Object newLength)\r
+ throws StandardException\r
+ {\r
+ String val = (String) newValue;\r
+ int newLen = ((Integer) newLength).intValue();\r
+\r
+ super.init(\r
+ TypeId.CHAR_ID,\r
+ (val == null) ? Boolean.TRUE : Boolean.FALSE,\r
+ newLength);\r
+\r
+ if (val.length() > newLen)\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_STRING_TRUNCATION, "CHAR", val, String.valueOf(newLen));\r
+ }\r
+\r
+ // Blank pad the string if necessesary\r
+ while (val.length() < newLen)\r
+ {\r
+ val = val + ' ';\r
+ }\r
+\r
+ setValue(getDataValueFactory().getCharDataValue(val));\r
+ }\r
+\r
+ /**\r
+ * Return the value from this CharConstantNode\r
+ *\r
+ * @return The value of this CharConstantNode.\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+\r
+ public String getString() throws StandardException\r
+ {\r
+ return value.getString();\r
+ }\r
+\r
+ /**\r
+ * Return the length\r
+ *\r
+ * @return The length of the value this node represents\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+\r
+ //public int getLength() throws StandardException\r
+ //{\r
+ // return value.getLength();\r
+ //}\r
+\r
+ /**\r
+ * Return an Object representing the bind time value of this\r
+ * expression tree. If the expression tree does not evaluate to\r
+ * a constant at bind time then we return null.\r
+ * This is useful for bind time resolution of VTIs.\r
+ * RESOLVE: What do we do for primitives?\r
+ *\r
+ * @return An Object representing the bind time value of this expression tree.\r
+ * (null if not a bind time constant.)\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+ Object getConstantValueAsObject() throws StandardException \r
+ {\r
+ return value.getString();\r
+ }\r
+ \r
+ public ValueNode bindExpression(\r
+ FromList fromList, SubqueryList subqueryList,\r
+ Vector aggregateVector)\r
+ throws StandardException\r
+ {\r
+ //The DTD for this character constant should get its collation type\r
+ //from the schema it is getting compiled in.\r
+ setCollationUsingCompilationSchema(\r
+ StringDataValue.COLLATION_DERIVATION_IMPLICIT);\r
+ //Once we have the collation type, we should check if the value\r
+ //associated with this node should change from \r
+ //SQLChar/SQLVarchar/SQLLongvarchar/SQLClob\r
+ //to\r
+ //CollatorSQLChar/CollatoSQLVarchar/CollatoSQLLongvarchar/CollatoSQLClob.\r
+ //By default, the value associated with char constants are SQLxxx\r
+ //kind because that is what is needed for UCS_BASIC collation. But\r
+ //if at this bind time, we find that the char constant's collation\r
+ //type is territory based, then we should change value from SQLxxx\r
+ //to CollatorSQLxxx. That is what is getting done below.\r
+ value = ((StringDataValue)value).getValue(\r
+ getLanguageConnectionContext().getDataValueFactory().getCharacterCollator(\r
+ getTypeServices().getCollationType()));\r
+ return this;\r
+ }\r
+\r
+ /**\r
+ * This generates the proper constant. It is implemented\r
+ * by every specific constant node (e.g. IntConstantNode).\r
+ *\r
+ * @param acb The ExpressionClassBuilder for the class being built\r
+ * @param mb The method the code to place the code\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+ void generateConstant(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException\r
+ {\r
+ // The generated java is the expression:\r
+ // "#getString()"\r
+ mb.push(getString());\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff