/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed 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 net.ontopia.persistence.query.sql;
import net.ontopia.utils.OntopiaRuntimeException;
/**
* INTERNAL: Represents an aggregate function in a SQL query.
*/
public class SQLAggregate implements SQLAggregateIF {
protected int type;
protected SQLValueIF value;
protected String alias;
public SQLAggregate(SQLValueIF value, int type) {
if (value == null)
throw new NullPointerException("Aggregate function variable cannot not be null.");
this.value = value;
this.type = type;
}
public int getType() {
return type;
}
public SQLValueIF getValue() {
return value;
}
public void setValue(SQLValueIF value) {
this.value = value;
}
public String getAlias() {
return alias;
}
public void setAlias(String alias) {
this.alias = alias;
}
public boolean isReference() {
return false;
}
public SQLAggregateIF getReference() {
throw new UnsupportedOperationException("SQLAggregateIF is not a reference, so this method should not be called.");
}
public String toString() {
StringBuilder sb = new StringBuilder();
switch (type) {
case COUNT:
sb.append("count");
break;
default:
throw new OntopiaRuntimeException("Unknown aggregate function type: " + type);
}
sb.append("(");
sb.append(value);
sb.append(")");
return sb.toString();
}
}