/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.language;
import java.util.List;
import org.teiid.language.visitor.LanguageObjectVisitor;
/**
* Represents an aggregate function.
*/
public class AggregateFunction extends Function {
public static final String COUNT = "COUNT"; //$NON-NLS-1$
public static final String AVG = "AVG"; //$NON-NLS-1$
public static final String SUM = "SUM"; //$NON-NLS-1$
public static final String MIN = "MIN"; //$NON-NLS-1$
public static final String MAX = "MAX"; //$NON-NLS-1$
public static final String STDDEV_POP = "STDDEV_POP"; //$NON-NLS-1$
public static final String STDDEV_SAMP = "STDDEV_SAMP"; //$NON-NLS-1$
public static final String VAR_SAMP = "VAR_SAMP"; //$NON-NLS-1$
public static final String VAR_POP = "VAR_POP"; //$NON-NLS-1$
private String aggName;
private boolean isDistinct;
private Expression condition;
private OrderBy orderBy;
public AggregateFunction(String aggName, boolean isDistinct, List<? extends Expression> params, Class<?> type) {
super(aggName, params, type);
this.aggName = aggName;
this.isDistinct = isDistinct;
}
/**
* Get the name of the aggregate function. This will be one of the constants defined
* in this class.
*/
public String getName() {
return this.aggName;
}
/**
* Determine whether this function was executed with DISTINCT. Executing
* with DISTINCT will remove all duplicate values in a group when evaluating
* the aggregate function.
* @return True if DISTINCT mode is used
*/
public boolean isDistinct() {
return this.isDistinct;
}
/**
* Get the expression within the aggregate function. The expression will be
* null for the special case COUNT(*). This is the only case where the
* expression will be null
* Only valid for 0/1 ary aggregates
* @return The expression or null for COUNT(*)
* @deprecated
*/
public Expression getExpression() {
if (this.getParameters().isEmpty()) {
return null;
}
return this.getParameters().get(0);
}
public void acceptVisitor(LanguageObjectVisitor visitor) {
visitor.visit(this);
}
/**
* Set the name of the aggregate function. This will be one of the constants defined
* in this class.
* @param name New aggregate function name
*/
public void setName(String name) {
this.aggName = name;
}
/**
* Set whether this function was executed with DISTINCT. Executing
* with DISTINCT will remove all duplicate values in a group when evaluating
* the aggregate function.
* @param isDistinct True if DISTINCT mode should be used
*/
public void setDistinct(boolean isDistinct) {
this.isDistinct = isDistinct;
}
/**
*
* @return the filter clause condition
*/
public Expression getCondition() {
return condition;
}
public void setCondition(Expression condition) {
this.condition = condition;
}
public OrderBy getOrderBy() {
return orderBy;
}
public void setOrderBy(OrderBy orderBy) {
this.orderBy = orderBy;
}
}