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https://issues.apache.org/jira/browse/TEXT-87?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rob Tompkins updated TEXT-87:
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Fix Version/s: 1.x
> 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
> Fix For: 1.x
>
>
> 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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