BELUGA BEHR created TEXT-87:
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Summary: StrBuilder Add Prefix Optimization
Key: TEXT-87
URL: https://issues.apache.org/jira/browse/TEXT-87
Project: Commons Text
Issue Type: New Feature
Reporter: BELUGA BEHR
Priority: Trivial
As a nice differentiation to Java's String Builder, please add an optimization
for pre-appending. Create the buffer a little larger and keep a pointer at the
0-index of the buffer so that pre-appending isn't necessarily a copy operations
and instead is simply a pointer update and an array value update.
{code}
public StrBuilder(int initialCapacity, int preCapacity);
// So that on something like this, insert(0, 'A'), isn't a guaranteed array copy
/**
* Inserts the value into this builder.
*
* @param index the index to add at, must be valid
* @param value the value to insert
* @return this, to enable chaining
* @throws IndexOutOfBoundsException if the index is invalid
*/
public StrBuilder insert(final int index, final char value) {
validateIndex(index);
// if index == 0 and (bufIndex != 0)
// buffer[bufIndexindex--] = value;
// return this;
ensureCapacity(size + 1);
System.arraycopy(buffer, index, buffer, index + 1, size - index);
buffer[index] = value;
size++;
return this;
}
{code}
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