org.codehaus.jackson.map.deser.EnumResolver Maven / Gradle / Ivy

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Data Mapper package is a high-performance data binding package built on Jackson JSON processor

There is a newer version: 1.9.13

package org.codehaus.jackson.map.deser;

import org.codehaus.jackson.map.AnnotationIntrospector;

import java.util.*;

/**
 * Helper class used to resolve String values (either Json Object field
 * names or regular String values) into Java Enum instances.
 */
public final class EnumResolver>
{
    protected final Class _enumClass;

    protected final T[] _enums;

    protected final HashMap _enumsById;

    private EnumResolver(Class enumClass, T[] enums, HashMap map)
    {
        _enumClass = enumClass;
        _enums = enums;
        _enumsById = map;
    }

    public static > EnumResolver constructFor(Class enumCls, AnnotationIntrospector ai)
    {
        ET[] enumValues = enumCls.getEnumConstants();
        HashMap map = new HashMap();
        for (ET e : enumValues) {
            map.put(ai.findEnumValue(e), e);
        }
        return new EnumResolver(enumCls, enumValues, map);
    }

    /**
     * This method is needed because of the dynamic nature of constructing Enum
     * resolvers.
     */
    @SuppressWarnings("unchecked")
    public static EnumResolver constructUnsafe(Class rawEnumCls, AnnotationIntrospector ai)
    {            
        /* This is oh so wrong... but at least ugliness is mostly hidden in just
         * this one place.
         */
        Class enumCls = (Class) rawEnumCls;
        return constructFor(enumCls, ai);
    }
    
    public T findEnum(String key)
    {
        return _enumsById.get(key);
    }

    public T getEnum(int index)
    {
        if (index < 0 || index >= _enums.length) {
            return null;
        }
        return _enums[index];
    }

    public Class getEnumClass() { return _enumClass; }

    public int lastValidIndex() { return _enums.length-1; }
}