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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview Utility for fast string concatenation.
*/
goog.provide('goog.string.StringBuffer');
/**
* Utility class to facilitate string concatenation.
*
* @param {*=} opt_a1 Optional first initial item to append.
* @param {...*} var_args Other initial items to
* append, e.g., new goog.string.StringBuffer('foo', 'bar').
* @constructor
*/
goog.string.StringBuffer = function(opt_a1, var_args) {
if (opt_a1 != null) {
this.append.apply(this, arguments);
}
};
/**
* Internal buffer for the string to be concatenated.
* @type {string}
* @private
*/
goog.string.StringBuffer.prototype.buffer_ = '';
/**
* Sets the contents of the string buffer object, replacing what's currently
* there.
*
* @param {*} s String to set.
*/
goog.string.StringBuffer.prototype.set = function(s) {
this.buffer_ = '' + s;
};
/**
* Appends one or more items to the buffer.
*
* Calling this with null, undefined, or empty arguments is an error.
*
* @param {*} a1 Required first string.
* @param {*=} opt_a2 Optional second string.
* @param {...?} var_args Other items to append,
* e.g., sb.append('foo', 'bar', 'baz').
* @return {!goog.string.StringBuffer} This same StringBuffer object.
* @suppress {duplicate}
*/
goog.string.StringBuffer.prototype.append = function(a1, opt_a2, var_args) {
// Use a1 directly to avoid arguments instantiation for single-arg case.
this.buffer_ += String(a1);
if (opt_a2 != null) { // second argument is undefined (null == undefined)
for (var i = 1; i < arguments.length; i++) {
this.buffer_ += arguments[i];
}
}
return this;
};
/**
* Clears the internal buffer.
*/
goog.string.StringBuffer.prototype.clear = function() {
this.buffer_ = '';
};
/**
* @return {number} the length of the current contents of the buffer.
*/
goog.string.StringBuffer.prototype.getLength = function() {
return this.buffer_.length;
};
/**
* @return {string} The concatenated string.
* @override
*/
goog.string.StringBuffer.prototype.toString = function() {
return this.buffer_;
};
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