/*
* 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.query.sql.lang;
import org.teiid.core.util.EquivalenceUtil;
import org.teiid.core.util.HashCodeUtil;
import org.teiid.query.optimizer.relational.rules.NewCalculateCostUtil;
import org.teiid.query.sql.LanguageVisitor;
import org.teiid.query.sql.symbol.ContextReference;
import org.teiid.query.sql.symbol.Expression;
/**
* The DependentSetCriteria is missing the value set until it is filled during
* processing. This allows a criteria to contain a dynamic set of values provided
* by a separate processing node.
* @since 5.0.1
*/
public class DependentSetCriteria extends AbstractSetCriteria implements ContextReference {
/**
* Specifies the expression whose values we want to return in the iterator
*/
private Expression valueExpression;
private String id;
/**
* The estimated number of distinct values for the value Expression
*/
private float ndv = NewCalculateCostUtil.UNKNOWN_VALUE;
private float maxNdv = NewCalculateCostUtil.UNKNOWN_VALUE;
/**
* Construct with the left expression
*/
public DependentSetCriteria(Expression expr, String id) {
setExpression(expr);
this.id = id;
}
@Override
public String getContextSymbol() {
return id;
}
public float getMaxNdv() {
return maxNdv;
}
public void setMaxNdv(float maxNdv) {
this.maxNdv = maxNdv;
}
public float getNdv() {
return ndv;
}
public void setNdv(float ndv) {
this.ndv = ndv;
}
/**
* Get the independent value expression
* @return Returns the valueExpression.
*/
public Expression getValueExpression() {
return this.valueExpression;
}
/**
* Set the independent value expression
* @param valueExpression The valueExpression to set.
*/
public void setValueExpression(Expression valueExpression) {
this.valueExpression = valueExpression;
}
public void acceptVisitor(LanguageVisitor visitor) {
visitor.visit(this);
}
/**
* Get hash code. WARNING: The hash code is based on data in the criteria.
* If data values are changed, the hash code will change - don't hash this
* object and change values.
* @return Hash code
*/
public int hashCode() {
int hc = 0;
hc = HashCodeUtil.hashCode(hc, getExpression());
return hc;
}
/**
* Override equals() method.
* @param obj Other object
* @return True if equal
*/
public boolean equals(Object obj) {
// Use super.equals() to check obvious stuff and variable
if(obj == this) {
return true;
}
if(!(obj instanceof DependentSetCriteria)) {
return false;
}
DependentSetCriteria sc = (DependentSetCriteria)obj;
if (isNegated() != sc.isNegated()) {
return false;
}
return EquivalenceUtil.areEqual(getExpression(), sc.getExpression()) &&
EquivalenceUtil.areEqual(getValueExpression(), sc.getValueExpression());
}
/**
* Deep copy of object. The values iterator source of this object
* will not be cloned - it will be passed over as is and shared with
* the original object, just like Reference.
* @return Deep copy of object
*/
public Object clone() {
Expression copy = null;
if(getExpression() != null) {
copy = (Expression) getExpression().clone();
}
DependentSetCriteria criteriaCopy = new DependentSetCriteria(copy, id);
if (this.valueExpression != null) {
criteriaCopy.setValueExpression((Expression) getValueExpression().clone());
}
criteriaCopy.id = this.id;
criteriaCopy.ndv = this.ndv;
criteriaCopy.maxNdv = this.maxNdv;
return criteriaCopy;
}
@Override
public void setNegated(boolean negationFlag) {
if (!negationFlag) {
throw new UnsupportedOperationException();
}
}
}