/*
 * 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.syntax;

import java.util.ArrayList;
import java.util.List;

import org.apache.jena.sparql.util.NodeIsomorphismMap;

public class ElementUnion extends Element {
    List<Element> elements = new ArrayList<>();

    public ElementUnion() {}

    public ElementUnion(Element el) {
        this();
        addElement(el);
    }

    public void addElement(Element el) { elements.add(el); }
    public List<Element> getElements() { return elements; }

    @Override
    public int hashCode() {
        int calcHashCode = Element.HashUnion;
        calcHashCode ^= getElements().hashCode();
        return calcHashCode;
    }

    @Override
    public boolean equalTo(Element el2, NodeIsomorphismMap isoMap) {
        if ( el2 == null )
            return false;

        if ( !(el2 instanceof ElementUnion) )
            return false;
        ElementUnion eu2 = (ElementUnion)el2;
        if ( this.getElements().size() != eu2.getElements().size() )
            return false;
        for ( int i = 0; i < this.getElements().size(); i++ ) {
            Element e1 = getElements().get(i);
            Element e2 = eu2.getElements().get(i);
            if ( !e1.equalTo(e2, isoMap) )
                return false;
        }
        return true;
    }

    @Override
    public void visit(ElementVisitor v) { v.visit(this); }
}
