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ChangeManager.java
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ChangeManager.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.sessions;
public interface ChangeManager {
/**
* This method does a quick check to find out whether there are any changes
* to the clone. It does a object value comparison, i. e. it compares each
* value of the clone against the original value and returns true if a
* change is found.
*
* @param original The original object.
* @param clone The clone, whose changes we are looking for.
* @return True if there is a change (at least one) or false, if the values are identical.
*/
boolean hasChanges(Object original, Object clone);
/**
* Calculates the changes that happened to the clone object. If there are no
* changes, null is returned. The changes are written into the change set
* passed in as argument.
*
* @param changeSet Contains references to the original and clone objects. Into this change set the changes should
* be propagated
* @return {@code true} if there were any changes, {@code false} otherwise
* @throws NullPointerException If {@code changeSet} is {@code null}
*/
boolean calculateChanges(ObjectChangeSet changeSet);
}