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package com.temp.shared.utils;
/**
* A Class to replace two booleans: Saved (unchanged) and Update (New vs Updating).
*
* This class carries two states about some other object:
* <OL>
* <LI> which CRUD operation is currently active</LI>
* <LI> is the other object in a "changed" state</LI>
* </OL>
*
* @author georgs
*/
public class DataState {
/**
* CRUD w/ supporting change management support flags
*/
public enum Operation {
Create(false, true), //
Read(false, false), //
Update(false, true), //
Delete(true, false);
private boolean initialChangedState;
private boolean allowsOtherChanges;
Operation(boolean initialChangedState, boolean allowsOtherChanges) {
this.initialChangedState = initialChangedState;
this.allowsOtherChanges = allowsOtherChanges;
}
public boolean getInitialChangedState() {
return initialChangedState;
}
public boolean allowsOtherChanges() {
return allowsOtherChanges;
}
}
private Operation operation;
private boolean changed;
public DataState() {
resetToRead();
}
public Operation getOperation() {
return operation;
}
private void setOperation(Operation operation) {
this.operation = operation;
resetChanges();
}
public void resetToCreate() {
setOperation(Operation.Create);
}
public void resetToRead() {
setOperation(Operation.Read);
}
public void resetToUpdate() {
setOperation(Operation.Update);
}
public void resetToDelete() {
setOperation(Operation.Delete);
}
public boolean isCreate() {
return operation.equals(Operation.Create);
}
public boolean isRead() {
return operation.equals(Operation.Read);
}
public boolean isUpdate() {
return operation.equals(Operation.Update);
}
public boolean isDelete() {
return operation.equals(Operation.Delete);
}
public void resetChanges(){
changed = operation.getInitialChangedState();
}
public boolean isChanged() {
return changed;
}
public void changed() {
if (!operation.allowsOtherChanges) {
throw new IllegalStateException("The " + operation + " does NOT allow the data to be changed!");
}
changed = true;
}
}
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Revision |
Author |
Commited |
Message |
626
|
GeorgeS
|
Wed 11 Apr, 2012 19:39:41 +0000 |
|