org.smartdeveloperhub.harvesters.it.frontend.issue.Linker.java Source code

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Here is the source code for org.smartdeveloperhub.harvesters.it.frontend.issue.Linker.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the Smart Developer Hub Project:
 *     http://www.smartdeveloperhub.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2015-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.smartdeveloperhub.harvesters.it.frontend:it-frontend-core:0.1.0
 *   Bundle      : it-frontend-core-0.1.0.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.smartdeveloperhub.harvesters.it.frontend.issue;

import java.io.Serializable;
import java.util.Collection;
import java.util.Set;

import org.ldp4j.application.data.IndividualHelper;
import org.ldp4j.application.data.Name;
import org.ldp4j.application.data.PropertyHelper;
import org.smartdeveloperhub.harvesters.it.frontend.vocabulary.RDF;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;

public abstract class Linker<V extends Serializable, K> {

    private final Set<String> inferredTypes;
    private final IndividualHelper helper;

    public Linker(final IndividualHelper helper) {
        this.helper = helper;
        this.inferredTypes = Sets.newLinkedHashSet();
    }

    public Linker<V, K> infer(final String type) {
        this.inferredTypes.add(type);
        return this;
    }

    public void link(final String relation, final Collection<? extends K> elements) {
        if (elements.isEmpty()) {
            return;
        }
        addInferredTypes();
        addRelations(relation, elements);
    }

    public void link(final String relation, final K element,
            @SuppressWarnings("unchecked") final K... moreElements) {
        if (element == null) {
            return;
        }
        link(relation, ImmutableList.<K>builder().add(element).add(moreElements).build());
    }

    private void addRelations(final String relation, final Collection<? extends K> elements) {
        final String managerId = managerId();
        final PropertyHelper property = this.helper.property(relation);
        for (final K key : elements) {
            property.withIndividual(createName(key), managerId);
        }
    }

    private void addInferredTypes() {
        final PropertyHelper property = this.helper.property(RDF.TYPE);
        for (final String type : this.inferredTypes) {
            property.withIndividual(type);
        }
    }

    protected abstract String managerId();

    protected abstract Name<V> createName(K key);

}