com.privatejgoodies.common.base.Objects Maven / Gradle / Ivy
/*
* Copyright (c) 2009-2013 JGoodies Software GmbH. 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 Software GmbH 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.privatejgoodies.common.base;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/**
* Provides static methods that operate on objects.
*
* @author Karsten Lentzsch
*/
public final class Objects {
private Objects() {
// Override default constructor; prevents instantiation.
}
// API ********************************************************************
/**
* Provides a means to copy objects that do not implement Cloneable. Performs a deep copy where
* the copied object has no references to the original object for any object that implements
* Serializable. If the original is {@code null}, this method just returns {@code null}.
*
* @param the type of the object to be cloned
* @param original the object to copied, may be {@code null}
* @return the copied object
*
* @since 1.1.1
*/
public static T deepCopy(T original) {
if (original == null) {
return null;
}
try {
final ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
final ObjectOutputStream oas = new ObjectOutputStream(baos);
oas.writeObject(original);
oas.flush();
// close is unnecessary
final ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
final ObjectInputStream ois = new ObjectInputStream(bais);
return (T) ois.readObject();
} catch (Throwable e) {
throw new RuntimeException("Deep copy failed", e);
}
}
/**
* Checks and answers if the two objects are both {@code null} or equal.
*
*
* Objects.equals(null, null) == true
* Objects.equals("Hi", "Hi") == true
* Objects.equals("Hi", null) == false
* Objects.equals(null, "Hi") == false
* Objects.equals("Hi", "Ho") == false
*
*
* @param o1 the first object to compare
* @param o2 the second object to compare
* @return boolean {@code true} if and only if both objects are {@code null} or equal according
* to {@link Object#equals(Object) equals} invoked on the first object
*/
public static boolean equals(Object o1, Object o2) {
return o1 == o2
|| o1 != null && o1.equals(o2);
}
}