org.apache.jena.sparql.expr.E_Exists Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jena-arq Show documentation
Show all versions of jena-arq Show documentation
ARQ is a SPARQL 1.1 query engine for Apache Jena
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.jena.sparql.expr;
import org.apache.jena.sparql.algebra.Algebra ;
import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.core.Substitute ;
import org.apache.jena.sparql.engine.QueryIterator ;
import org.apache.jena.sparql.engine.binding.Binding ;
import org.apache.jena.sparql.function.FunctionEnv ;
import org.apache.jena.sparql.graph.NodeTransform;
import org.apache.jena.sparql.graph.NodeTransformLib ;
import org.apache.jena.sparql.sse.Tags ;
import org.apache.jena.sparql.syntax.Element ;
public class E_Exists extends ExprFunctionOp
{
private static final String symbol = Tags.tagExists ;
public E_Exists(Op op) {
this(null, op) ;
}
public E_Exists(Element elt) {
this(elt, Algebra.compile(elt)) ;
}
public E_Exists(Element el, Op op) {
super(symbol, el, op) ;
}
@Override
public Expr copySubstitute(Binding binding) {
Op op2 = Substitute.substitute(getGraphPattern(), binding) ;
return new E_Exists(getElement(), op2) ;
}
@Override
public Expr applyNodeTransform(NodeTransform nodeTransform) {
Op op2 = NodeTransformLib.transform(nodeTransform, getGraphPattern()) ;
return new E_Exists(getElement(), op2) ;
}
@Override
protected NodeValue eval(Binding binding, QueryIterator qIter, FunctionEnv env) {
boolean b = qIter.hasNext() ;
return NodeValue.booleanReturn(b) ;
}
@Override
public int hashCode() {
return symbol.hashCode() ^ getGraphPattern().hashCode() ;
}
@Override
public boolean equals(Expr other, boolean bySyntax) {
if ( other == null ) return false ;
if ( this == other ) return true ;
if ( ! ( other instanceof E_Exists ) )
return false ;
E_Exists ex = (E_Exists)other ;
if ( bySyntax )
return this.getElement().equals(ex.getElement()) ;
else
return this.getGraphPattern().equals(ex.getGraphPattern()) ;
}
@Override
public ExprFunctionOp copy(ExprList args, Op x) { return new E_Exists(x) ; }
@Override
public ExprFunctionOp copy(ExprList args, Element elPattern) { return new E_Exists(elPattern) ; }
}