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- /*--
-
- $Id: TextBuffer.java,v 1.10 2007/11/10 05:29:00 jhunter Exp $
-
- Copyright (C) 2000-2007 Jason Hunter & Brett McLaughlin.
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions, and the following disclaimer.
-
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions, and the disclaimer that follows
- these conditions in the documentation and/or other materials
- provided with the distribution.
-
- 3. The name "JDOM" must not be used to endorse or promote products
- derived from this software without prior written permission. For
- written permission, please contact <request_AT_jdom_DOT_org>.
-
- 4. Products derived from this software may not be called "JDOM", nor
- may "JDOM" appear in their name, without prior written permission
- from the JDOM Project Management <request_AT_jdom_DOT_org>.
-
- In addition, we request (but do not require) that you include in the
- end-user documentation provided with the redistribution and/or in the
- software itself an acknowledgement equivalent to the following:
- "This product includes software developed by the
- JDOM Project (http://www.jdom.org/)."
- Alternatively, the acknowledgment may be graphical using the logos
- available at http://www.jdom.org/images/logos.
-
- THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- SUCH DAMAGE.
-
- This software consists of voluntary contributions made by many
- individuals on behalf of the JDOM Project and was originally
- created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
- Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
- on the JDOM Project, please see <http://www.jdom.org/>.
-
- */
-
- package org.jdom.input;
-
- import org.jdom.*;
-
- /**
- * A non-public utility class similar to StringBuffer but optimized for XML
- * parsing where the common case is that you get only one chunk of characters
- * per text section. TextBuffer stores the first chunk of characters in a
- * String, which can just be returned directly if no second chunk is received.
- * Subsequent chunks are stored in a supplemental char array (like StringBuffer
- * uses). In this case, the returned text will be the first String chunk,
- * concatenated with the subsequent chunks stored in the char array. This
- * provides optimal performance in the common case, while still providing very
- * good performance in the uncommon case. Furthermore, avoiding StringBuffer
- * means that no extra unused char array space will be kept around after parsing
- * is through.
- *
- * @version $Revision: 1.10 $, $Date: 2007/11/10 05:29:00 $
- * @author Bradley S. Huffman
- * @author Alex Rosen
- */
- class TextBuffer {
-
- private static final String CVS_ID =
- "@(#) $RCSfile: TextBuffer.java,v $ $Revision: 1.10 $ $Date: 2007/11/10 05:29:00 $ $Name: jdom_1_1 $";
-
- /** The first part of the text value (the "prefix"). If null, the
- * text value is the empty string. */
- private String prefixString;
-
- /** The rest of the text value (the "suffix"). Only the first
- * code>arraySize</code> characters are valid. */
- private char[] array;
-
- /** The size of the rest of the text value. If zero, then only
- * code>prefixString</code> contains the text value. */
- private int arraySize;
-
- /** Constructor */
- TextBuffer() {
- array = new char[4096]; // initial capacity
- arraySize = 0;
- }
-
- /** Append the specified text to the text value of this buffer. */
- void append(char[] source, int start, int count) {
- if (prefixString == null) {
- // This is the first chunk, so we'll store it in the prefix string
- prefixString = new String(source, start, count);
- }
- else {
- // This is a subsequent chunk, so we'll add it to the char array
- ensureCapacity(arraySize + count);
- System.arraycopy(source, start, array, arraySize, count);
- arraySize += count;
- }
- }
-
- /** Returns the size of the text value. */
- int size() {
- if (prefixString == null) {
- return 0;
- }
- else {
- return prefixString.length() + arraySize;
- }
- }
-
- /** Clears the text value and prepares the TextBuffer for reuse. */
- void clear() {
- arraySize = 0;
- prefixString = null;
- }
-
- boolean isAllWhitespace() {
- if ((prefixString == null) || (prefixString.length() == 0)) {
- return true;
- }
-
- int size = prefixString.length();
- for(int i = 0; i < size; i++) {
- if ( !Verifier.isXMLWhitespace(prefixString.charAt(i))) {
- return false;
- }
- }
-
- for(int i = 0; i < arraySize; i++) {
- if ( !Verifier.isXMLWhitespace(array[i])) {
- return false;
- }
- }
- return true;
- }
-
- /** Returns the text value stored in the buffer. */
- public String toString() {
- if (prefixString == null) {
- return "";
- }
-
- String str = "";
- if (arraySize == 0) {
- // Char array is empty, so the text value is just prefixString.
- str = prefixString;
- }
- else {
- // Char array is not empty, so the text value is prefixString
- // plus the char array.
- str = new StringBuffer(prefixString.length() + arraySize)
- .append(prefixString)
- .append(array, 0, arraySize)
- .toString();
- }
- return str;
- }
-
- // Ensure that the char array has room for at least "csize" characters.
- private void ensureCapacity(int csize) {
- int capacity = array.length;
- if (csize > capacity) {
- char[] old = array;
- int nsize = capacity;
- while (csize > nsize) {
- nsize += (capacity/2);
- }
- array = new char[nsize];
- System.arraycopy(old, 0, array, 0, arraySize);
- }
- }
- }
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