/*
* 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 java.util.concurrent.atomic.AtomicInteger;
import org.teiid.core.util.EquivalenceUtil;
import org.teiid.core.util.HashCodeUtil;
import org.teiid.query.sql.LanguageVisitor;
import org.teiid.query.sql.lang.PredicateCriteria.Negatable;
import org.teiid.query.sql.symbol.ContextReference;
/**
* This predicate criteria implements the "exists" predicate, which has
* a subquery in it. For example,
* "EXISTS (Select EmployeeID FROM Employees WHERE EmployeeName = 'Smith')".
*/
public class ExistsCriteria extends PredicateCriteria
implements SubqueryContainer.Evaluatable<QueryCommand>, ContextReference, Negatable {
public static class SubqueryHint {
public static String MJ = "MJ"; //$NON-NLS-1$
public static String NOUNNEST = "NO_UNNEST"; //$NON-NLS-1$
public static String DJ = "DJ"; //$NON-NLS-1$
private boolean mergeJoin;
private boolean noUnnest;
private boolean depJoin;
public void setMergeJoin(boolean semiJoin) {
this.mergeJoin = semiJoin;
}
public boolean isMergeJoin() {
return mergeJoin;
}
public void setNoUnnest(boolean noUnnest) {
this.noUnnest = noUnnest;
}
public boolean isNoUnnest() {
return noUnnest;
}
public void setDepJoin() {
this.depJoin = true;
this.mergeJoin = true;
}
public boolean isDepJoin() {
return depJoin;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof SubqueryHint)) {
return false;
}
SubqueryHint other = (SubqueryHint) obj;
return mergeJoin == other.mergeJoin
&& noUnnest == other.noUnnest
&& depJoin == other.depJoin;
}
public SubqueryHint clone() {
SubqueryHint clone = new SubqueryHint();
clone.mergeJoin = this.mergeJoin;
clone.noUnnest = this.noUnnest;
clone.depJoin = this.depJoin;
return clone;
}
}
private static AtomicInteger ID = new AtomicInteger();
private QueryCommand command;
private String id = "$ec/id" + ID.getAndIncrement(); //$NON-NLS-1$
private boolean shouldEvaluate;
private boolean negated;
private SubqueryHint subqueryHint = new SubqueryHint();
/**
* Default constructor
*/
public ExistsCriteria() {
super();
}
public ExistsCriteria(QueryCommand subqueryCommand){
this.command = subqueryCommand;
}
public boolean shouldEvaluate() {
return shouldEvaluate;
}
public void setShouldEvaluate(boolean shouldEvaluate) {
this.shouldEvaluate = shouldEvaluate;
}
@Override
public String getContextSymbol() {
return id;
}
public QueryCommand getCommand() {
return this.command;
}
public void setCommand(QueryCommand subqueryCommand){
this.command = subqueryCommand;
}
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, getCommand());
return hc;
}
/**
* Override equals() method.
* @param obj Other object
* @return True if equal
*/
public boolean equals(Object obj) {
if(obj == this) {
return true;
}
if(!(obj instanceof ExistsCriteria)) {
return false;
}
ExistsCriteria other = (ExistsCriteria)obj;
return EquivalenceUtil.areEqual(getCommand(), other.getCommand()) &&
this.negated == other.negated &&
this.subqueryHint.equals(other.subqueryHint);
}
public SubqueryHint getSubqueryHint() {
return subqueryHint;
}
public void setSubqueryHint(SubqueryHint subqueryHint) {
this.subqueryHint = subqueryHint;
}
/**
* Deep copy of object. The values Iterator of this object
* will not be cloned - it will be null in the new object
* (see #setValueIterator setValueIterator}).
* @return Deep copy of object
* @see java.lang.Object#clone()
*/
public Object clone() {
ExistsCriteria ec = new ExistsCriteria((QueryCommand) this.command.clone());
ec.subqueryHint = this.subqueryHint.clone();
ec.setNegated(this.negated);
ec.shouldEvaluate = this.shouldEvaluate;
return ec;
}
public boolean isNegated() {
return negated;
}
public void setNegated(boolean negated) {
this.negated = negated;
}
@Override
public void negate() {
this.negated = !this.negated;
}
}