| /* |
| * Copyright (c) 1998, 2020 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: |
| * <p><b>Purpose</b>: 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; |
| } |
| @Override |
| public int length() { |
| return numChar; |
| } |
| |
| @Override |
| public String toString() { |
| return new String(this.myBuf, 0, this.numChar); |
| } |
| |
| @Override |
| public char charAt(int index) { |
| return myBuf[index]; |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| return new String(this.myBuf, start, end); |
| } |
| |
| } |