分享关于j2mexmlReader的轻量级实现

　　
　　四、轻量级的xmlReader
　　
　　幸运的是kobject.org网站上提供了一个轻量级的xmlReader程序，大家可以到http://kobjects.sourceforge.net/utils/ 获取。
　　
　　作为简单的xml解析器，功能上与kxml类似，但是不支持命名空间和一些传统的事件。整个jar文件大小小于5KB。
　　
　　以下便是其代码：
　　XmlReader.java
　　/* Copyright (c) 2002,2003, Stefan Haustein, Oberhausen, Rhld., Germany *
　　* Permission is hereby granted, free of charge, to any person obtaining a copy
　　* of this software and associated documentation files (the "Software"), to deal
　　* in the Software without restriction, including without limitation the rights
　　* to use, copy, modify, merge, publish, distribute, sublicense, and/or
　　* sell copies of the Software, and to permit persons to whom the Software is
　　* furnished to do so, subject to the following conditions: * * The　above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * 网管u家u.bitsCN.com
　　* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
　　* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
　　* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
　　* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
　　* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
　　* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
　　* IN THE SOFTWARE. */package org.kobjects.xml;import java.io.*;
　　import java.util.*;
　　/** A minimalistic XML pull parser, similar to kXML, but
　　not supporting namespaces or legacy events. If you need
　　support for namespaces, or access to XML comments or
　　processing instructions, please use kXML(2) instead. */public class XmlReader {
　　/** Return value of getType before first call to next()　*/
　　public final static int START_DOCUMENT = 0;
　　/** Signal logical end of xml document */
　　public final static int END_DOCUMENT = 1;
　　/** Start tag was just read */　　public final static int START_TAG = 2;
　　/**　　 * End tag was just read
　　*/
　　public final static int END_TAG = 3;
　　/** Text was just read　*/
　　public final static int TEXT = 4;
　　final static int CDSECT = 5;
　　final static int ENTITY_REF = 6;
　　static final private String UNEXPECTED_EOF =
　　"Unexpected EOF";
　　static final private int LEGACY = 999;
　　// general　　public boolean relaxed;
　　private Hashtable entityMap;
　　private int depth;
　　private String[] elementStack = new String[4];
　　// source　　private Reader reader;
　　private char[] srcBuf =
　　new char[Runtime.getRuntime().freeMemory() >= 1048576
　　? 8192
　　: 128];
　　private int srcPos;
　　private int srcCount;
　　private boolean eof;
　　private int line;
　　private int column;
　　private int peek0;
　　private int peek1;
　　// txtbuffer 网管u家u.bitscn@com
　　private char[] txtBuf = new char[128];
　　private int txtPos;
　　// Event-related
　　private int type;
　　private String text;
　　private boolean isWhitespace;
　　private String name;
　　private boolean degenerated;
　　private int attributeCount;
　　private String[] attributes = new String[16];
　　private String[] TYPES =
　　{
　　"Start Document",
　　"End Document",
　　"Start Tag",
　　"End Tag",
　　"Text" };
　　private final int read() throws IOException {
　　int r = peek0;
　　peek0 = peek1;
　　if (peek0 == -1) {
　　eof = true;
　　return r;
　　}　　　　else if (r ==
    || r == ) {
　　line++;
　　column = 0;
　　if (r == && peek0 ==
    )
　　peek0 = 0;　　　　}
　　column++;
　　if (srcPos >= srcCount) {
　　srcCount = reader.read(srcBuf, 0, srcBuf.length);
　　if (srcCount <= 0) {
　　peek1 = -1;
　　return r;
　　}
　　srcPos = 0; 网管u家www.bitscn.net
　　}
　　peek1 = srcBuf[srcPos++];
　　return r;
　　}
　　private final void exception(String desc)
　　throws IOException {
　　throw new IOException(
　　desc + " pos: " + getPositionDescription());
　　}
　　private final void push(int c) {
　　if (c == 0)
　　return;
　　if (txtPos == txtBuf.length) {
　　char[] bigger = new char[txtPos * 4 / 3 + 4];
　　System.arraycopy(txtBuf, 0, bigger, 0, txtPos);
　　txtBuf = bigger;
　　}
　　txtBuf[txtPos++] = (char) c;
　　}　　private final void read(char c) throws IOException {
　　if (read() != c) {
　　if (relaxed) {
　　if (c <= 32) {
　　skip();
　　read();
　　}
　　}
　　else {
　　exception("expected: " + c + "");
　　}
　　}
　　}
　　private final void skip() throws IOException {
　　while (!eof && peek0 <= )
　　read();
　　}
　　private final String pop(int pos) {
　　String result = new String(txtBuf, pos, txtPos - pos);
　　txtPos = pos;
　　return result;
　　}
　　private final String readName() throws IOException {
　　int pos = txtPos;　　　　int c = peek0;
　　if ((c < a || c > z)
　　&& (c < A || c > Z)
　　&& c != _
　　&& c != :
　　&& !relaxed)

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