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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 to/from a Boolean value.
    

    Converts the following to a Boolean
    
    String: 
        if fmt is not null, then compares with true, false format values (case insensitive).  
        If none match then null is returned.
        If fmt is null then returns true if value equals "true", "yes", "t", "y" (all case insensitive).  
        Otherwise false.
    
Number: true if value != 0.  Otherwise false.
    
Character: true if 't', 'y', isDigit() and not '0' (case insensitive).  Otherwise false.
    
All others value will return null.
    
    

    Converts a Boolean to any of the following
    
    String, using an optional format.
    

    @see OAConverter
*/
public class OAConverterBoolean implements OAConverterInterface {

    /**
        Convert to/from a Boolean value.
        @param clazz Class to convert to.  
        @param value if converting to boolean, then any type.  If converting from boolean, then boolean value or null.
        @param fmt format string to determine values for true, false, null.  Ex: "true;false;null", "yes;no;maybe"
        @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(Boolean.class) || clazz.equals(boolean.class)) return convertToBoolean(value, fmt);
        if (value == null || value instanceof Boolean) return convertFromBoolean(clazz, (Boolean) value, fmt);
        return null;
    }        

    public Boolean convertToBoolean(Object value, String fmt) {
        if (value instanceof Boolean) {
            return (Boolean) value;
        }
        if (value == null) {
            return Boolean.FALSE;
        }
        
        boolean b = false;
        if (value instanceof String) {
            String str = (String)value;
            if (fmt != null && fmt.length() > 0) {
                String s = OAString.field(fmt,";",1);
                b = (s.equalsIgnoreCase(str));
                if (!b) {
                    s = OAString.field(fmt,";",2);
                    b = (s.equalsIgnoreCase(str));
                    if (!b) return null;
                    b = false;
                }
            }
            else {
                if (str.length() == 0) {
                    b = false;
                }
                else if (str.length() == 1) {
                    char c = str.charAt(0);
                    if (c == 'F' || c == 'f' || c == 'N' || c == 'n' || (Character.isDigit(c) && c == '0')) b = false;
                    else b = true;
                }
                else if (OAString.isNumber(str)) {
                    b = false;
                    int cnt = 0;
                    for (int i=0; !b && i 0) b = true;
                        }
                        else if (c != '0') b = true;
                    }
                }
                else {
                    if (str.equalsIgnoreCase("false") || str.equalsIgnoreCase("no")) b = false;
                    else b = (str.length() > 0);
                }
            }
            return new Boolean(b);
        }
            
        if (value instanceof Number) {
            return new Boolean(((Number) value).doubleValue() != 0.0);
        }
        char c = 0;
        b = false;
        if (value instanceof Byte) {
             c = (char) ((Byte)value).byteValue();
             b = true;
        }            
        if (value instanceof Character) {
            c = ((Character)value).charValue();
            b = true;
        }
        if (b) {
            if (c == 'T' || c == 't' || c == 'Y' || c == 'y' || (Character.isDigit(c) && c != '0')) b = true;
            return new Boolean(b);
        }
        return (value != null);
    }

    public Object convertFromBoolean(Class toClass, Boolean bValue, String fmt) {
        if (toClass.equals(String.class)) {
            // fmt is three values to use for true/false/null sep by ';'  ex: "yes;no;none"
            if (fmt != null) {
                if (bValue == null) return OAString.field(fmt,";",3);
                if ( bValue.booleanValue() ) return OAString.field(fmt,";",1);
                return OAString.field(fmt,";",2);
            }
            if (bValue == null) return "";
            return bValue.toString();
        }
        if (toClass.equals(Integer.class)) {
            if (bValue == null) return new Integer(0);;
            if ( bValue.booleanValue() ) return new Integer(1);
            return new Integer(0);
        }
        return null;
    }

}