io.gdcc.xoai.services.impl.AbstractMetadataSearcher Maven / Gradle / Ivy

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/*
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package io.gdcc.xoai.services.impl;

import io.gdcc.xoai.model.xoai.Element;
import io.gdcc.xoai.model.xoai.XOAIMetadata;
import io.gdcc.xoai.services.api.MetadataSearch;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public abstract class AbstractMetadataSearcher implements MetadataSearch {

    protected static final String DEFAULT_FIELD = "value";
    protected Map> index = new HashMap<>();

    protected AbstractMetadataSearcher(XOAIMetadata metadata) {
        for (Element element : metadata.getElements()) {
            consume(new ArrayList<>(), element);
        }
    }

    @Override
    public T findOne(String xoaiPath) {
        List elements = index.get(xoaiPath);
        if (elements != null && !elements.isEmpty()) return elements.get(0);
        return null;
    }

    @Override
    public List findAll(String xoaiPath) {
        return index.get(xoaiPath);
    }

    @Override
    public Map> index() {
        return index;
    }

    protected void init(XOAIMetadata metadata) {
        for (Element element : metadata.getElements()) {
            consume(new ArrayList<>(), element);
        }
    }

    protected abstract void consume(List newNames, Element element);
}