/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.core.client.impl;
/**
* <p>
* The interface to defer bound implementations of {@link StringBuilder} and
* {@link StringBuffer}.
* </p>
*
* <p>
* All of the implementations have been carefully tweaked to get the most
* inlining possible, so be sure to check with benchmark whenever these classes
* are modified.
* </p>
*/
public abstract class StringBufferImpl {
public static String reverseString(String s) {
int length = s.length();
if (length <= 1) {
return s;
}
char[] buffer = new char[length];
buffer[0] = s.charAt(length - 1);
for (int i = 1; i < length; i++) {
buffer[i] = s.charAt(length - 1 - i);
if (Character.isSurrogatePair(buffer[i], buffer[i - 1])) {
swap(buffer, i - 1, i);
}
}
return new String(buffer);
}
private static void swap(char[] buffer, int f, int s) {
char tmp = buffer[f];
buffer[f] = buffer[s];
buffer[s] = tmp;
}
/**
* Append for primitive; the value can be stored and only later converted to a string.
*/
public abstract void append(Object data, boolean x);
/**
* Append for primitive; the value can be stored and only later converted to a
* string.
*/
public abstract void append(Object data, double x);
/**
* Append for primitive; the value can be stored and only later converted to a
* string.
*/
public abstract void append(Object data, float x);
/**
* Append for primitive; the value can be stored and only later converted to a
* string.
*/
public abstract void append(Object data, int x);
/**
* Append for object. It is important to immediately convert the object to a
* string, because the conversion can give different results if it is
* deferred.
*/
public abstract void append(Object data, Object x);
/**
* Append for a possibly null string object.
*/
public abstract void append(Object data, String x);
/**
* Append for a string that is definitely not null.
*/
public abstract void appendNonNull(Object data, String x);
/**
* Returns a data holder object for use with subsequent calls.
*/
public abstract Object createData();
/**
* Returns the current length of the string buffer.
*/
public abstract int length(Object data);
/**
* Replaces a segment of the string buffer.
*/
public abstract void replace(Object data, int start, int end, String toInsert);
/**
* Reverses the whole StringBuffer/Builder
*/
public abstract void reverse(Object data);
/**
* Returns the string buffer as a String.
*/
public abstract String toString(Object data);
}