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/*  Copyright 1999 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.converter;

import com.viaoa.util.*;


/**
    Convert a value to/from a Character value.
    

    Converts the following to a Character
    
    If a String and one char in length, then the first char in the String.
    
If a boolean, then it will be converted to either a 'T' or 'F'.
    
If numeric, and value is within the MIN and MAX values of a Character, then the intValue.
    
Otherwise, null is returned.
    
    

    Converts a Character to any of the following
    
    String, single character. ex: 'T' = "T"
    

    @see OAConverter
*/
public class OAConverterCharacter implements OAConverterInterface {

    /**
        Convert a value to/from a Character value.
        parma value is object to convert.

        @param clazz is Character.Class if converting a value to a Character or the Class to convert a Character to.
        @return Object of type clazz if conversion can be done, else null.
    */
    public Object convert(Class clazz, Object value, String fmt) {
        if (clazz == null) return null;
        if (clazz.equals(Character.class) || clazz.equals(char.class)) return convertToCharacter(value);
        if (value != null && value instanceof Character) return convertFromCharacter(clazz, (Character) value);
        return null;
    }
        
    protected Character convertToCharacter(Object value) {
        if (value instanceof Character) return (Character) value;
        if (value instanceof String) {
            String str = (String)value;
            if (str.length() == 1) return new Character(str.charAt(0));
            return null;
        }
        
        if (value instanceof Number) {
            int x = ((Number) value).intValue();
            if (x >= Character.MIN_VALUE && x <= Character.MAX_VALUE) return new Character((char)x);
            return null;
        }
        if (value instanceof Boolean) {
            return new Character( ((Boolean)value).booleanValue() ? 'T' : 'F' );
        }
        return null;
    }


    protected Object convertFromCharacter(Class toClass, Character charValue) {
        if (toClass.equals(String.class)) {
            return charValue.toString();
        }
        return null;
    }


}