org.apache.cayenne.tools.CayenneGeneratorMapLoaderAction Maven / Gradle / Ivy

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 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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package org.apache.cayenne.tools;

import java.io.File;
import java.net.MalformedURLException;

import org.apache.cayenne.configuration.DataMapLoader;
import org.apache.cayenne.di.Injector;
import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.resource.URLResource;

/**
 * Loads a DataMap and a shared entity namespace.
 * 
 * @since 3.0
 */
class CayenneGeneratorMapLoaderAction {

    private File mainDataMapFile;
    private File[] additionalDataMapFiles;
    private DataMap mainDataMap;

    private transient Injector injector;

    CayenneGeneratorMapLoaderAction(Injector injector) {
        this.injector = injector;
    }

    DataMap getMainDataMap() throws MalformedURLException {
        if (mainDataMap == null) {
            DataMapLoader loader = createLoader();

            DataMap mainDataMap = loadDataMap(loader, mainDataMapFile);

            if (additionalDataMapFiles != null) {

                EntityResolver entityResolver = new EntityResolver();
                entityResolver.addDataMap(mainDataMap);
                mainDataMap.setNamespace(entityResolver);

                for (File additionalDataMapFile : additionalDataMapFiles) {

                    DataMap dataMap = loadDataMap(loader, additionalDataMapFile);
                    entityResolver.addDataMap(dataMap);
                    dataMap.setNamespace(entityResolver);
                }
            }

            this.mainDataMap = mainDataMap;
        }

        return mainDataMap;
    }

    DataMapLoader createLoader() {
        return injector.getInstance(DataMapLoader.class);
    }

    protected DataMap loadDataMap(DataMapLoader mapLoader, File dataMapFile) throws MalformedURLException {
        return mapLoader.load(new URLResource(dataMapFile.toURI().toURL()));
    }

    void setMainDataMapFile(File mainDataMapFile) {
        this.mainDataMapFile = mainDataMapFile;
    }

    void setAdditionalDataMapFiles(File[] additionalDataMapFiles) {
        this.additionalDataMapFiles = additionalDataMapFiles;
    }
}