enjoy 4.3 release ^_^
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James
@@ -16,102 +16,153 @@
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package com.jfinal.template.io;
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import java.io.IOException;
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import java.io.Writer;
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/**
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* FastStringWriter
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*
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* <pre>
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* 由 JDK 中 StringWriter 改造而来，在其基础之上做了如下改变：
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* 1：StringBuffer 属性改为 StringBuilder，避免了前者的 synchronized 操作
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* 2：添加了 MAX_SIZE 属性
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* 3：去掉了 close() 方法声明中的 throws IOException，并添加了代码，原先该方法中无任何代码
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* 由 JDK 中 Writer 改造而来，在其基础之上做了如下改变：
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* 1：添加 char[] value 直接保存 char 值
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* 2：添加 int len 记录数据长度
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* 3：去掉 synchronized 操作
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* 4：添加 MAX_BUFFER_SIZE，限定 value 被重用的最大长度
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* 5：去掉了 close() 方法声明中的 throws IOException，并添加缓存回收逻辑
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* </pre>
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*/
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public class FastStringWriter extends Writer {
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private StringBuilder buf;
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private char[] value;
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private int len;
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public FastStringWriter() {
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buf = new StringBuilder();
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}
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public FastStringWriter(int initialSize) {
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if (initialSize < 0) {
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throw new IllegalArgumentException("Negative buffer size");
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}
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buf = new StringBuilder(initialSize);
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}
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public void write(int c) {
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buf.append((char) c);
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}
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public void write(char cbuf[], int off, int len) {
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if ((off < 0) || (off > cbuf.length) || (len < 0) ||
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((off + len) > cbuf.length) || ((off + len) < 0)) {
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throw new IndexOutOfBoundsException();
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} else if (len == 0) {
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return;
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}
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buf.append(cbuf, off, len);
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}
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public void write(String str) {
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buf.append(str);
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}
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public void write(String str, int off, int len) {
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buf.append(str.substring(off, off + len));
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}
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public FastStringWriter append(CharSequence csq) {
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if (csq == null) {
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write("null");
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} else {
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write(csq.toString());
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}
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return this;
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}
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public FastStringWriter append(CharSequence csq, int start, int end) {
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CharSequence cs = (csq == null ? "null" : csq);
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write(cs.subSequence(start, end).toString());
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return this;
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}
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public FastStringWriter append(char c) {
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write(c);
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return this;
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}
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public String toString() {
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return buf.toString();
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}
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public StringBuilder getBuffer() {
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return buf;
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}
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public void flush() {
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}
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static int MAX_SIZE = 1024 * 64;
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/**
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* 由 StringWriter.close() 改造而来，原先该方法中无任何代码 ，改造如下：
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* 1：去掉 throws IOException
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* 2：添加 buf 空间释放处理逻辑
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* 3：添加 buf.setLength(0)，以便于配合 ThreadLocal 回收利用
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*/
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public void close() {
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if (buf.length() > MAX_SIZE) {
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buf = new StringBuilder(MAX_SIZE / 2); // 释放空间占用过大的 buf
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} else {
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buf.setLength(0);
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private static int MAX_BUFFER_SIZE = 1024 * 256; // 1024 * 64;
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public static void setMaxBufferSize(int maxBufferSize) {
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int min = 256;
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if (maxBufferSize < min) {
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throw new IllegalArgumentException("maxBufferSize must more than " + min);
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}
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}
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MAX_BUFFER_SIZE = maxBufferSize;
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}
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@Override
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public void close() /* throws IOException */ {
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len = 0;
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// 释放空间占用过大的缓存
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if (value.length > MAX_BUFFER_SIZE) {
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value = new char[Math.max(256, MAX_BUFFER_SIZE / 2)];
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}
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}
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public String toString() {
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return new String(value, 0, len);
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}
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public StringBuilder toStringBuilder() {
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return new StringBuilder(len + 64).append(value, 0, len);
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}
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public FastStringWriter(int capacity) {
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value = new char[capacity];
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}
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public FastStringWriter() {
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this(128);
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}
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/**
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* 扩容
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*/
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protected void expandCapacity(int newLen) {
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int newCapacity = Math.max(newLen, value.length * 2);
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char[] newValue = new char[newCapacity];
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// 复制 value 中的值到 newValue
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if (len > 0) {
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System.arraycopy(value, 0, newValue, 0, len);
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}
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value = newValue;
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}
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@Override
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public void write(char buffer[], int offset, int len) throws IOException {
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int newLen = this.len + len;
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if (newLen > value.length) {
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expandCapacity(newLen);
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}
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System.arraycopy(buffer, offset, value, this.len, len);
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this.len = newLen;
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}
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@Override
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public void write(String str, int offset, int len) throws IOException {
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int newLen = this.len + len;
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if (newLen > value.length) {
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expandCapacity(newLen);
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}
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str.getChars(offset, (offset + len), value, this.len);
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this.len = newLen;
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}
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@Override
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public void write(int c) throws IOException {
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char[] buffer = {(char)c};
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write(buffer, 0, 1);
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}
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@Override
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public void write(char buffer[]) throws IOException {
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write(buffer, 0, buffer.length);
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}
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@Override
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public void write(String str) throws IOException {
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write(str, 0, str.length());
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}
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@Override
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public Writer append(CharSequence csq) throws IOException {
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if (csq instanceof String) {
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String str = (String)csq;
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write(str, 0, str.length());
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return this;
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}
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if (csq == null)
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write("null");
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else
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write(csq.toString());
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return this;
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}
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@Override
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public Writer append(CharSequence csq, int start, int end) throws IOException {
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if (csq instanceof String) {
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String str = (String)csq;
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write(str, start, (end - start));
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return this;
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}
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CharSequence cs = (csq == null ? "null" : csq);
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write(cs.subSequence(start, end).toString());
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return this;
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}
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@Override
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public Writer append(char c) throws IOException {
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char[] buffer = {c};
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write(buffer, 0, 1);
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return this;
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}
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@Override
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public void flush() throws IOException {
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}
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}
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