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Preserve int-ness of policy constants and newList() signature, add isEmpty().

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This will hopefully take us as far down the road of backwads binary
compatibility as needed.
This commit is contained in:
Michael Bayne
2011-04-05 13:47:26 -07:00
parent 9c6b7a9603
commit 739007a000
1 changed files with 20 additions and 2 deletions
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src/main/java/com/samskivert/util/ObserverList.java
+20 -2
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@@ -121,10 +121,10 @@ public abstract class ObserverList<T>
};
/** @deprecated Use {@link Policy.SAFE_IN_ORDER}. */
@Deprecated public static final Policy SAFE_IN_ORDER_NOTIFY = Policy.SAFE_IN_ORDER;
@Deprecated public static final int SAFE_IN_ORDER_NOTIFY = 1;
/** @deprecated Use {@link Policy.FAST_UNSAFE}. */
@Deprecated public static final Policy FAST_UNSAFE_NOTIFY = Policy.FAST_UNSAFE;
@Deprecated public static final int FAST_UNSAFE_NOTIFY = 2;
/**
* A convenience method for creating an observer list that avoids duplicating the type
@@ -153,6 +153,16 @@ public abstract class ObserverList<T>
return new Impl<T>(notifyPolicy, allowDups);
}
/** @deprecated Switch to {@link Policy} constants. */
@Deprecated public static <T> ObserverList<T> newList (int notifyPolicy, boolean allowDups)
{
switch (notifyPolicy) {
case SAFE_IN_ORDER_NOTIFY: return newList(Policy.SAFE_IN_ORDER, allowDups);
case FAST_UNSAFE_NOTIFY: return newList(Policy.FAST_UNSAFE, allowDups);
default: throw new IllegalArgumentException("Unknown policy " + notifyPolicy);
}
}
/**
* Adds an observer at the specified index.
* @return true if the observer was added, false if it was already in the list.
@@ -187,6 +197,14 @@ public abstract class ObserverList<T>
*/
public abstract void clear ();
/**
* Returns true if this list has no observers, false otherwise.
*/
public boolean isEmpty ()
{
return size() == 0;
}
protected static class Impl<T> extends ObserverList<T> {
protected Impl (Policy notifyPolicy, boolean allowDups) {
_policy = notifyPolicy;