org.eclipse.persistence.internal.oxm.StrBuffer Maven / Gradle / Ivy
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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.oxm;
/**
* INTERNAL:
* Purpose: This is a non-synchronized, reusable implementation of
* StringBuffer.
* @author mmacivor
*/
public class StrBuffer implements CharSequence {
private int numChar; //The number of characters currently in this buffer
private char[] myBuf;
public StrBuffer() {
this(80);
}
public StrBuffer(int length) {
myBuf = new char[length];
numChar = 0;
}
/*
* Clears the StringBuffer to be reused.
*/
public void reset() {
numChar = 0;
}
private void increaseCapacity(int minStorage) {
int newStorage = (myBuf.length * 2) + 5;
if(newStorage < minStorage) {
newStorage = minStorage;
}
char[] newBuf = new char[newStorage];
System.arraycopy(this.myBuf, 0, newBuf, 0, this.numChar);
this.myBuf = newBuf;
}
public StrBuffer append(String str) {
int strlen = str.length();
int newLength = this.numChar + strlen;
if(newLength > this.myBuf.length) {
increaseCapacity(newLength);
}
str.getChars(0, strlen, this.myBuf, this.numChar);
this.numChar = newLength;
return this;
}
public StrBuffer append(char[] chars, int start, int length) {
int newLength = this.numChar + length;
if(newLength > this.myBuf.length) {
increaseCapacity(newLength);
}
System.arraycopy(chars, start, this.myBuf, numChar, length);
this.numChar = newLength;
return this;
}
public int length() {
return numChar;
}
public String toString() {
return new String(this.myBuf, 0, this.numChar);
}
public char charAt(int index) {
return myBuf[index];
}
public CharSequence subSequence(int start, int end) {
return new String(this.myBuf, start, end);
}
}