From 50f76a2e82bbcc97665d320350aa0ead9bbc101b Mon Sep 17 00:00:00 2001
From: "calvin.xiao" <calvin.xiao@vipshop.com>
Date: Mon, 7 Dec 2015 21:42:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0StringBuilderHolder=EF=BC=8C?=
 =?UTF-8?q?=E5=8F=AF=E9=87=8D=E7=94=A8=E7=9A=84StringBuilder=EF=BC=88?=
 =?UTF-8?q?=E5=8F=8A=E5=85=B6char[]=EF=BC=89=EF=BC=8C=E5=8F=AF=E9=85=8D?=
 =?UTF-8?q?=E5=90=88ThreadLocal=E4=BD=BF=E7=94=A8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../modules/utils/StringBuilderHolder.java    | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 modules/utils/src/main/java/org/springside/modules/utils/StringBuilderHolder.java

diff --git a/modules/utils/src/main/java/org/springside/modules/utils/StringBuilderHolder.java b/modules/utils/src/main/java/org/springside/modules/utils/StringBuilderHolder.java
new file mode 100644
index 00000000..6174e840
--- /dev/null
+++ b/modules/utils/src/main/java/org/springside/modules/utils/StringBuilderHolder.java
@@ -0,0 +1,38 @@
+package org.springside.modules.utils;
+
+/**
+ * 参考BigDecimal, 可重用的StringBuilder, 节约StringBuilder内部的char[]
+ * 
+ * 参考下面的示例代码将其保存为ThreadLocal.
+ * 
+ * <pre>
+ * private static final ThreadLocal<StringBuilderHelper> threadLocalStringBuilderHolder = new ThreadLocal<StringBuilderHelper>() {
+ * 	&#64;Override
+ * 	protected StringBuilderHelper initialValue() {
+ * 		return new StringBuilderHelper(256);
+ * 	}
+ * };
+ * 
+ * StringBuilder sb = threadLocalStringBuilderHolder.get().resetAndGetStringBuilder();
+ * 
+ * </pre>
+ * 
+ * @author calvin
+ *
+ */
+public class StringBuilderHolder {
+
+	private final StringBuilder sb;
+
+	public StringBuilderHolder(int capacity) {
+		sb = new StringBuilder(capacity);
+	}
+
+	/**
+	 * 重置StringBuilder内部的writerIndex, 而char[]保留不动.
+	 */
+	public StringBuilder resetAndGetStringBuilder() {
+		sb.setLength(0);
+		return sb;
+	}
+}
\ No newline at end of file