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Optimise the remove implementation for performance of common case 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@131840 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2005-01-22 00:48:22 +00:00
parent 46d73eac81
commit 1da9c06f4d
1 changed files with 16 additions and 10 deletions
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26
src/java/org/apache/commons/collections/buffer/BoundedFifoBuffer.java
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@ -53,7 +53,7 @@ import org.apache.commons.collections.BufferUnderflowException;
* This class is Serializable from Commons Collections 3.1.
*
* @since Commons Collections 3.0 (previously in main package v2.1)
* @version $Revision: 1.10 $ $Date: 2005/01/15 22:47:40 $
* @version $Revision: 1.11 $ $Date: 2005/01/22 00:48:22 $
*
* @author Avalon
* @author Berin Loritsch
@ -355,15 +355,21 @@ public class BoundedFifoBuffer extends AbstractCollection
return;
}
// Other elements require us to shift the subsequent elements
int i = lastReturnedIndex + 1;
while (i != end) {
if (i >= maxElements) {
elements[i - 1] = elements[0];
i = 0;
} else {
elements[decrement(i)] = elements[i];
i = increment(i);
int pos = lastReturnedIndex + 1;
if (start < lastReturnedIndex && pos < end) {
// shift in one part
System.arraycopy(elements, pos, elements,
lastReturnedIndex, end - pos);
} else {
// Other elements require us to shift the subsequent elements
while (pos != end) {
if (pos >= maxElements) {
elements[pos - 1] = elements[0];
pos = 0;
} else {
elements[decrement(pos)] = elements[pos];
pos = increment(pos);
}
}
}