core-libs-dev Digest, Vol 7, Issue 8

[Paulo Levi]

Could you look in fixing the insertString(int where, String str) or
was it replace(int position, String str, int addsize), method in
GapContent ?
Currently it makes a totally unneeded copy that stresses the garbage
collector where it could use something like this (i removed the
undoableEdit on purpose)
public UndoableEdit insertString(int where, String str) throws
BadLocationException {
            if (where > length() || where < 0) {
                throw new BadLocationException("Invalid insert", length());
            }
            //char [] s = str.toCharArray();
            //replace(where, 0, s, s.length);
            replace(where, str, str.length());

            return null;
        }


        protected void replace(int position, String addItems, int addSize) {
            if (addSize == 0) {
                return;
            } else {
                int end = open(position, addSize);
                //System.arraycopy(addItems, rmSize, array, end, endSize);
                addItems.getChars(0, addSize, (char[]) getArray(), end);
            }
        }

Another thing:
the default smallattributeset created in the DefaultStyledDocument
takes far to much time to be found in a hashmap (where it lives) i
added a small check for the degenerate case where the attribute count
is equal to 0 to not have to enter containsattributes. In my
application this was a hotstop, i don't remember exactly where (
I think it was setCharacterAttributes of DefaultStyledDocument, that
caused in turn an addEdit to a DefaultDocumentEvent that used a
hashmap, and that edit would be got later).

protected SmallAttributeSet createSmallAttributeSet(AttributeSet a) {
            return new SmallAttributeSet(a){
                //hashcode of superclass. Redefined to see if
weakhasmap behaves better
                @Override
                public boolean equals(Object obj){
                    if (obj instanceof AttributeSet) {
                        AttributeSet attrs = (AttributeSet) obj;
                        return getAttributeCount() == attrs.getAttributeCount()
                        && (getAttributeCount() == 0 ||
containsAttributes(attrs));
                    }
                    return false;
                }

            };
        }