/*
* Copyright (c) 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.binding;
/**
* Consists exclusively of static methods that provide
* convenience behavior used by the Binding classes.
*
* @author Karsten Lentzsch
* @version $Revision: 1.5 $
*/
public final class BindingUtils {
private BindingUtils() {
// Override default constructor; prevents instantiation.
}
/**
* Checks and answers if the two objects are
* both <code>null</code> or equal.
*
* <pre>
* #equals(null, null) == true
* #equals("Hi", "Hi") == true
* #equals("Hi", null) == false
* #equals(null, "Hi") == false
* #equals("Hi", "Ho") == false
* </pre>
*
* @param o1 the first object to compare
* @param o2 the second object to compare
* @return boolean <code>true</code> if and only if
* both objects are <code>null</code> or equal
*/
public static boolean equals(Object o1, Object o2) {
return ((o1 != null) && (o2 != null) && (o1.equals(o2)))
|| ((o1 == null) && (o2 == null));
}
/**
* Checks and answers if the given string is whitespace,
* empty (<code>""</code>) or <code>null</code>.
*
* <pre>
* #isBlank(null) == true
* #isBlank("") == true
* #isBlank(" ") == true
* #isBlank("Hi ") == false
* </pre>
*
* @param str the string to check, may be <code>null</code>
* @return <code>true</code> if the string is whitespace, empty
* or <code>null</code>
* @see #isEmpty(String)
*/
public static boolean isBlank(String str) {
return str == null || str.trim().length() == 0;
}
/**
* Checks and answers if the given string is empty (<code>""</code>)
* or <code>null</code>.<p>
*
* <pre>
* #isEmpty(null) == true
* #isEmpty("") == true
* #isEmpty(" ") == false
* #isEmpty("Hi ") == false
* </pre>
*
* @param str the string to check, may be <code>null</code>
* @return <code>true</code> if the string is empty or <code>null</code>
* @see #isBlank(String)
*/
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
}
}
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