Java Boolean From toBoolean(Object anObj)

Description

Converts parameter to Boolean.

License

Mozilla Public License

Parameter

Parameter	Description
anObj	object to convert

Return

boolean

Declaration

public static Boolean toBoolean(Object anObj) 

Method Source Code

//package com.java2s;
/*//w w  w .  j av  a 2  s. c  om
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Original Code is 'JSignPdf, a free application for PDF signing'.
 * 
 * The Initial Developer of the Original Code is Josef Cacek.
 * Portions created by Josef Cacek are Copyright (C) Josef Cacek. All Rights Reserved.
 * 
 * Contributor(s): Josef Cacek.
 * 
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License, version 2.1 (the  "LGPL License"), in which case the
 * provisions of LGPL License are applicable instead of those
 * above. If you wish to allow use of your version of this file only
 * under the terms of the LGPL License and not to allow others to use
 * your version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the LGPL License. If you do not delete
 * the provisions above, a recipient may use your version of this file
 * under either the MPL or the LGPL License.
 */

public class Main {
    /**
     * Converts parameter to Boolean.
     * <ol>
     * <li>If given value is null, null is returned back</li>
     * <li>If given value is Boolean instance, it is retured unchanged</li>
     * <li>In all other cases is value converted to string and compared (ignoring case) to following:
     * <ul>
     * <li>"true", "yes", "on" - Boolean.TRUE is returned</li>
     * <li>"false", "no", "off" - Boolean.FALSE is returned</li>
     * <li>anything else - null is returned</li>
     * </ul>
     * </li>
     * </ol>
     * @param anObj object to convert
     * @return boolean
     */
    public static Boolean toBoolean(Object anObj) {
        Boolean tmpResult = null;
        if (anObj == null) {
            //nothing to do
        } else if (anObj instanceof Boolean) {
            tmpResult = (Boolean) anObj;
        } else {
            final String tmpStr = toString(anObj);
            if ("true".equalsIgnoreCase(tmpStr) || "yes".equalsIgnoreCase(tmpStr)
                    || "on".equalsIgnoreCase(tmpStr)) {
                tmpResult = Boolean.TRUE;
            } else if ("false".equalsIgnoreCase(tmpStr) || "no".equalsIgnoreCase(tmpStr)
                    || "off".equalsIgnoreCase(tmpStr)) {
                tmpResult = Boolean.FALSE;
            }
        }
        return tmpResult;
    }

    /**
     * Converts given value to boolean, if it is possible. When the conversion fails (null value)
     * the given default value is returned
     * @param anObj value to convert
     * @param aDefault default value
     * @return converted value (or default)
     * @see #toBoolean(Object)
     */
    public static boolean toBoolean(Object anObj, boolean aDefault) {
        final Boolean tmpBool = toBoolean(anObj);
        return tmpBool == null ? aDefault : tmpBool.booleanValue();
    }

    /**
     * Converts given value to String. If null is provided as parameter null is returned.
     * @param anObj value
     * @return String
     */
    public static String toString(Object anObj) {
        return anObj == null ? null : anObj.toString();
    }

    /**
     * Converts given value to String.
     * @param aValue value
     * @return String
     */
    public static String toString(int aValue) {
        return String.valueOf(aValue);
    }

    /**
     * Converts given value to String.
     * @param aValue value
     * @return String
     */
    public static String toString(long aValue) {
        return String.valueOf(aValue);
    }

    /**
     * Converts given value to String.
     * @param aValue value
     * @return String
     */
    public static String toString(float aValue) {
        return String.valueOf(aValue);
    }

    /**
     * Converts given value to String.
     * @param aValue value
     * @return String
     */
    public static String toString(double aValue) {
        return String.valueOf(aValue);
    }

    /**
     * Converts given value to String.
     * @param aValue value
     * @return String
     */
    public static String toString(boolean aValue) {
        return String.valueOf(aValue);
    }
}

Related

1. toBoolean(final String value, final boolean def)
2. toBoolean(int i)
3. toBoolean(int value)
4. toBoolean(Integer value, Integer trueValue, Integer falseValue)
5. toBoolean(Number value)
6. toBoolean(Object bool)
7. toBoolean(Object o)
8. toBoolean(Object o)
9. toBoolean(Object o)