The previous sample code I posted was foolish, I'm sorry!!!
Find attached a better version that uses a single Object reference to
track both initialization and modify state.
During initialization this Object references a byte[] where each element
tracks the init state of the corresponding attribute.
Init ends when all attributes has been set at least once or when the
client code calls a provided method.
After init has ended the byte[] is discarded and the Object references
the static instance of Boolean.FALSE (so there's no memory wasted
beyound the single Object reference itself).
After at least one attributes is set, the Object references the static
instance Boolean.TRUE.
Client code can decide to force init end with a non-modified state or
even an already-modified state, if it likes to.
The code does not check if the new value set for an attribute is equal
or not to the value already present. This is because a == check would
not be good because two different Integer instances both containing the
same value are to be considered equal.
So the equals() method should be used, but that is not garanteed to work
with all class types, so I think it may be better to skip the check
altogether and consider an attribute modified in any case.
Hope this is helpful!!! :-)
Bye
Paolo
public class BasicFeature {
private Object[] attributes;
private Object mods;
public void forceInitEnded(boolean modified) {
//force init end and specified modify state
mods = modified ? Boolean.TRUE : Boolean.FALSE;
}
public boolean isInitEnded() {
if( mods instanceof Boolean ) //init ended
return true;
if( mods == null ) { //if still null
mods = new byte[attributes.length]; //create it
Arrays.fill((byte[])mods,(byte)0); //fill with zeros
return false; //init not even started
}
for(int i=0;i<((byte[])mods).length;i++)
if( ((byte[])mods)[i] == 0 ) //if any attribute never flagged
return false; //init not ended
forceInitEnded(false); //init ended, no mods done
return true; //init ended
}
public void setAttribute(Object[] newAttributes) {
//call setAttribute() for each element
}
public void setAttribute(int attributeIndex, Object newAttribute) {
if( isInitEnded() ) //if init ended
mods = Boolean.TRUE; //feature modified
else
//if
init not ended
((byte[])mods)[attributeIndex] = 1; //flag the attributes mod
attributes[attributeIndex] = newAttribute;
}
public boolean isModified() {
return isInitEnded() ? ((Boolean)mods).booleanValue() : false;
}
}
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