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package org.nakedobjects.metamodel.value;

import org.nakedobjects.metamodel.adapter.InvalidEntryException;
import org.nakedobjects.metamodel.adapter.NakedObject;
import org.nakedobjects.metamodel.config.NakedObjectConfiguration;
import org.nakedobjects.metamodel.facets.Facet;
import org.nakedobjects.metamodel.facets.FacetHolder;
import org.nakedobjects.metamodel.facets.value.CharValueFacet;
import org.nakedobjects.metamodel.runtimecontext.RuntimeContext;
import org.nakedobjects.metamodel.specloader.SpecificationLoader;


public abstract class CharValueSemanticsProviderAbstract extends ValueSemanticsProviderAbstract implements CharValueFacet {

    private static Class type() {
        return CharValueFacet.class;
    }

    private static final boolean IMMUTABLE = true;
    private static final boolean EQUAL_BY_CONTENT = true;
    private static final int TYPICAL_LENGTH = 1;

    public CharValueSemanticsProviderAbstract(
    		final FacetHolder holder, final Class adaptedClass, final Object defaultValue,
            final NakedObjectConfiguration configuration, 
            final SpecificationLoader specificationLoader, 
            final RuntimeContext runtimeContext) {
        super(type(), holder, adaptedClass, TYPICAL_LENGTH, IMMUTABLE, EQUAL_BY_CONTENT, defaultValue, configuration, specificationLoader, runtimeContext);
    }

    // //////////////////////////////////////////////////////////////////
    // Parser
    // //////////////////////////////////////////////////////////////////

    @Override
    public Object doParse(final Object original, final String entry) {
        if (entry.length() > 1) {
            throw new InvalidEntryException("Only a single character is required");
        } else {
            return new Character(entry.charAt(0));
        }
    }

    @Override
    public String titleString(final Object value) {
        return value == null ? "" : value.toString();
    }

    // //////////////////////////////////////////////////////////////////
    // EncoderDecoder
    // //////////////////////////////////////////////////////////////////

    @Override
    protected String doEncode(final Object object) {
        return object.toString();
    }

    @Override
    protected Object doRestore(final String data) {
        return new Character(data.charAt(0));
    }

    // //////////////////////////////////////////////////////////////////
    // CharValueFacet
    // //////////////////////////////////////////////////////////////////

    public Character charValue(final NakedObject object) {
        return object == null ? null : (Character) object.getObject();
    }

    public NakedObject createValue(final Character value) {
        return getRuntimeContext().adapterFor(value);
    }


    // /////// toString ///////

    @Override
    public String toString() {
        return "CharacterValueSemanticsProvider";
    }


}
// Copyright (c) Naked Objects Group Ltd.