/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.jdbc.kernel.exps;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.Arguments;
/**
* A unary operator that executes a datastore specific function with zero or more arguments.
*
* @author Pinaki Poddar
*
*/
@SuppressWarnings("serial")
public class DatastoreFunction extends UnaryOp {
private final String _functionName;
public DatastoreFunction(String name, Class<?> resultType, Arguments args) {
super((Val)args);
_functionName = name;
setImplicitType(resultType);
}
@Override
protected String getOperator() {
return _functionName;
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
Args args = (Args) getValue();
if (!ctx.store.getDBDictionary().requiresCastForMathFunctions || args.getValues().length == 1) {
super.appendTo(sel, ctx, state, sql, index);
} else {
sql.append(getOperator());
sql.append("(");
args.appendTo(sel, ctx, state, sql, 0, getOperator());
sql.append(")");
}
}
}