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JSimpleDB classes supporting Vaadin applications.

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/*
 * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
 */

package org.jsimpledb.vaadin;

import com.google.common.base.Preconditions;
import com.vaadin.data.util.converter.Converter;

import java.util.Locale;

import org.jsimpledb.JObject;
import org.jsimpledb.JTransaction;
import org.jsimpledb.core.ObjId;

/**
 * Vaadin {@link Converter} for that converts between {@link ObjId}'s and {@link JObject}s.
 */
@SuppressWarnings("serial")
public class ReferenceFieldConverter implements Converter {

    private final JTransaction jtx;

    /**
     * Constructor.
     *
     * @param jtx transaction containing the {@link JObject}
     */
    public ReferenceFieldConverter(JTransaction jtx) {
        Preconditions.checkArgument(jtx != null, "null jtx");
        this.jtx = jtx;
    }

    @Override
    public Class getPresentationType() {
        return ObjId.class;
    }

    @Override
    public Class getModelType() {
        return JObject.class;
    }

    @Override
    public ObjId convertToPresentation(JObject jobj, Class targetType, Locale locale) {
        if (jobj == null)
            return null;
        return jobj.getObjId();
    }

    @Override
    public JObject convertToModel(ObjId id, Class targetType, Locale locale) {
        if (id == null)
            return null;
        return this.jtx.get(id);
    }
}