/*******************************************************************************
 * Copyright (c) 2012, Directors of the Tyndale STEP Project
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 * 
 * Redistributions of source code must retain the above copyright 
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the following disclaimer in 
 * the documentation and/or other materials provided with the 
 * distribution.
 * Neither the name of the Tyndale House, Cambridge (www.TyndaleHouse.com)  
 * nor the names of its contributors may be used to endorse or promote 
 * products derived from this software without specific prior written 
 * permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
 * THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
package com.tyndalehouse.step.core.xsl.impl;

import java.util.HashSet;
import java.util.Set;

import javax.inject.Inject;

import com.tyndalehouse.step.core.data.EntityDoc;
import com.tyndalehouse.step.core.data.EntityIndexReader;
import com.tyndalehouse.step.core.data.EntityManager;

/**
 * Provides extra cross-references to be displayed next to the passage
 */
public class CrossReferenceProviderImpl {

    private final EntityIndexReader nave;

    /**
     * Instantiates a new cross reference provider impl.
     * 
     * @param manager the data manager
     */
    @Inject
    public CrossReferenceProviderImpl(final EntityManager manager) {
        this.nave = manager.getReader("nave");
    }

    /**
     * Gets the references.
     * 
     * @param osisID the osis id
     * @return the references that have been found
     */
    public Set<String> getReferences(final String osisID) {
        final EntityDoc[] results = this.nave.search("expandedReferences", osisID);
        final Set<String> refs = new HashSet<String>(results.length * 2);
        for (int i = 0; i < results.length; i++) {
            refs.add(results[i].get("references"));
        }
        return refs;
    }
}