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Core Implementation of LD Path a simple path-based query language similar to XPath or SPARQL Property Paths that is particularly well-suited for querying and retrieving resources from the Linked Data Cloud by following RDF links between resources and servers.

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/*
 * Copyright (c) 2011 Salzburg Research.
 *
 * Licensed 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 at.newmedialab.ldpath.model.tests;

import at.newmedialab.ldpath.api.backend.RDFBackend;
import at.newmedialab.ldpath.api.tests.NodeTest;

import java.util.Collection;

/**
 * Tests the disjunction of two tests.
 * 
 * Author: Sebastian Schaffert 
 */
public class OrTest implements NodeTest {

    private NodeTest left;
    private NodeTest right;

    public OrTest(NodeTest left, NodeTest right) {
        this.left = left;
        this.right = right;
    }

    /**
     * Apply the function to the list of nodes passed as arguments and return the result as type T.
     * Throws IllegalArgumentException if the function cannot be applied to the nodes passed as argument
     * or the number of arguments is not correct.
     *
     * @param args a nested list of KiWiNodes
     * @return
     */
    @Override
    public Boolean apply(RDFBackend rdfBackend, Collection... args) throws IllegalArgumentException {
        return left.apply(rdfBackend, args) || right.apply(rdfBackend, args);
    }

    /**
     * Return the name of the NodeFunction for registration in the function registry
     *
     * @param rdfBackend
     * @return
     */
    @Override
    public String getPathExpression(RDFBackend rdfBackend) {
        return String.format("%s | %s", left.getPathExpression(rdfBackend), right.getPathExpression(rdfBackend));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        @SuppressWarnings("rawtypes")
        OrTest orTest = (OrTest) o;

        if (left != null ? !left.equals(orTest.left) : orTest.left != null) return false;
        if (right != null ? !right.equals(orTest.right) : orTest.right != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = left != null ? left.hashCode() : 0;
        result = 31 * result + (right != null ? right.hashCode() : 0);
        return result;
    }
}