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ARQ is a SPARQL 1.1 query engine for Apache Jena
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/*
 * 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.algebra.op;

import java.util.List ;

import org.apache.jena.graph.Node ;
import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.algebra.OpVisitor ;
import org.apache.jena.sparql.algebra.Transform ;
import org.apache.jena.sparql.pfunction.PropFuncArg ;
import org.apache.jena.sparql.sse.Tags ;
import org.apache.jena.sparql.util.Iso ;
import org.apache.jena.sparql.util.NodeIsomorphismMap ;

/** Property functions (or any OpBGP replacement)
 *  Execution will be per-engine specific */
public class OpPropFunc extends Op1
{
    // c.f. OpProcedure which is similar except for the handling of arguments.
    // Safer to have two (Ops are mainly abstract syntax, not executional).
    private Node uri ;
    private PropFuncArg subjectArgs ;
    private PropFuncArg objectArgs ;

    public OpPropFunc(Node uri, PropFuncArg args1 , PropFuncArg args2, Op op)
    {
        super(op) ;
        this.uri = uri ;
        this.subjectArgs = args1 ;
        this.objectArgs = args2 ;
    }
    
    public PropFuncArg getSubjectArgs() {
        return subjectArgs ;
    } 
    
    public PropFuncArg getObjectArgs() {
        return objectArgs ;
    } 
    
    @Override
    public Op apply(Transform transform, Op subOp) {
        return transform.transform(this, subOp) ;
    }

    @Override
    public void visit(OpVisitor opVisitor)
    { opVisitor.visit(this) ; }

    public Node getProperty() { return uri ; }
    
    @Override
    public String getName() {
        return Tags.tagPropFunc ;
    }

    @Override
    public Op1 copy(Op op) {
        return new OpPropFunc(uri, subjectArgs, objectArgs, op) ;
    }

    @Override
    public int hashCode() {
        return uri.hashCode() ^ getSubOp().hashCode() ;
    }

    @Override
    public boolean equalTo(Op other, NodeIsomorphismMap labelMap) {
        if ( ! ( other instanceof OpPropFunc ) ) 
            return false ;
        OpPropFunc procFunc = (OpPropFunc)other ;
        if ( ! this.getProperty().equals(procFunc.getProperty()) )
            return false ;
        
        PropFuncArg s1 = getSubjectArgs() ;
        PropFuncArg s2 = procFunc.getSubjectArgs() ;
        s1.equals(s2) ;
        
        if ( ! isomorphic(getSubjectArgs(), procFunc.getSubjectArgs(), labelMap) )
            return false ;
        if ( ! isomorphic(getObjectArgs(), procFunc.getObjectArgs(), labelMap) )
            return false ;
        return getSubOp().equalTo(procFunc.getSubOp(), labelMap) ;
    }

    private static boolean isomorphic(PropFuncArg pfa1, PropFuncArg pfa2, NodeIsomorphismMap labelMap) {
        if ( pfa1 == null && pfa2 == null )
            return true ;
        if ( pfa1 == null ) return false ;
        if ( pfa2 == null ) return false ;
        
        if ( pfa1.isList() && pfa2.isList() ) {
            List list1 = pfa1.getArgList() ;
            List list2 = pfa2.getArgList() ;
            return Iso.isomorphicNodes(list1, list2, labelMap) ;
        }
        if ( pfa1.isNode() && pfa2.isNode() )
            return Iso.nodeIso(pfa1.getArg(), pfa2.getArg(), labelMap) ;
        return false ;
    }
}