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package io.legaldocml.akn.element;


import com.google.common.collect.ImmutableMap;
import io.legaldocml.akn.AknObject;
import io.legaldocml.akn.MandatoryAttributeException;
import io.legaldocml.akn.attribute.Language;
import io.legaldocml.akn.visitor.AknVisitor;
import io.legaldocml.io.AttributeGetterSetter;
import io.legaldocml.io.XmlWriter;
import io.legaldocml.io.impl.Buffers;

import java.io.IOException;

import static io.legaldocml.akn.AknAttributes.LANGUAGE;
import static io.legaldocml.akn.AknElements.FRBR_LANGUAGE;
import static io.legaldocml.akn.element.Attributes.attributeGetterSetter4String;
import static io.legaldocml.akn.util.XmlWriterHelper.throwException;
import static io.legaldocml.unsafe.UnsafeHelper.getFieldOffset;
import static io.legaldocml.unsafe.UnsafeString.getChars;

/**
 * The element FRBRlanguage is the metadata property containing a RFC4646 (three-letter code) of the main human language
 * used in the content of this expression.
 * 
 * 
 *   
 *     
 * 	     
 * 		   
 * 		     
 * 		   
 * 	     
 *     
 *   
 * 
 *
 * @author Jacques Militello
 */
public final class FRBRlanguage extends MetaOpt implements Language {

    /**
     * Memory address.
     */
    private static final long ADDRESS_FRBR_LANGUAGE = Buffers.address(FRBR_LANGUAGE);

    private static final ImmutableMap> ATTRIBUTES;

    static {
        ATTRIBUTES = ImmutableMap.>builder()
                .putAll(MetaOpt.ATTRIBUTES)
                .put(LANGUAGE, attributeGetterSetter4String(LANGUAGE, getFieldOffset(FRBRlanguage.class, "language")))
                .build();
    }

    private String language;

    /**
     * {@inheritDoc}
     */
    public String getLanguage() {
        return language;
    }

    /**
     * {@inheritDoc}
     */
    public void setLanguage(String language) {
        this.language = language;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void write(XmlWriter writer) throws IOException {
        writer.writeStart(ADDRESS_FRBR_LANGUAGE, 12);
        if (this.language != null) {
            writer.writeAttribute(Attributes.ADDRESS_LANGUAGE, 8, getChars(this.language));
        } else {
            throwException(writer, new MandatoryAttributeException(this, LANGUAGE, writer));
        }
        super.write(writer);
        writer.writeEnd(ADDRESS_FRBR_LANGUAGE, 12);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String name() {
        return FRBR_LANGUAGE;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ImmutableMap> attributes() {
        return ATTRIBUTES;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void accept(AknVisitor visitor) {
        visitor.visit(this);
    }

}