/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 2008.
*
* Licensed under the Aduna BSD-style license.
*/
package org.openrdf.sail.rdbms.algebra.base;
import org.openrdf.query.algebra.QueryModelNode;
import org.openrdf.query.algebra.QueryModelVisitor;
import org.openrdf.query.algebra.helpers.QueryModelTreePrinter;
import org.openrdf.sail.rdbms.optimizers.SqlConstantOptimizer;
/**
* An SQL operator with one argument.
*
* @author James Leigh
*/
public abstract class UnarySqlOperator extends RdbmsQueryModelNodeBase implements SqlExpr {
private SqlExpr arg;
public UnarySqlOperator() {
super();
}
public UnarySqlOperator(SqlExpr arg) {
super();
setArg(arg);
}
public SqlExpr getArg() {
return arg;
}
public void setArg(SqlExpr arg) {
this.arg = arg;
arg.setParentNode(this);
}
@Override
public <X extends Exception> void visitChildren(QueryModelVisitor<X> visitor)
throws X
{
arg.visit(visitor);
}
@Override
public void replaceChildNode(QueryModelNode current, QueryModelNode replacement) {
if (arg == current) {
setArg((SqlExpr)replacement);
}
else {
super.replaceChildNode(current, replacement);
}
}
@Override
public UnarySqlOperator clone() {
UnarySqlOperator clone = (UnarySqlOperator)super.clone();
clone.setArg(arg.clone());
return clone;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((arg == null) ? 0 : arg.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final UnarySqlOperator other = (UnarySqlOperator)obj;
if (arg == null) {
if (other.arg != null) {
return false;
}
}
else if (!arg.equals(other.arg)) {
return false;
}
return true;
}
@Override
public String toString() {
QueryModelTreePrinter treePrinter = new QueryModelTreePrinter();
UnarySqlOperator clone = this.clone();
UnarySqlOperator parent = new UnarySqlOperator(clone) {
@Override
public <X extends Exception> void visit(RdbmsQueryModelVisitorBase<X> visitor)
throws X
{
visitor.meetOther(this);
}
};
new SqlConstantOptimizer().optimize(clone);
parent.getArg().visit(treePrinter);
return treePrinter.getTreeString();
}
}