Adding ThreadSafe notes to some obviously threadsafe classes (LANG-370)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@918369 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/ArrayUtils.java

@@ -33,6 +33,7 @@
  * array input. However, an Object array that contains a <code>null</code>
  * element may throw an exception. Each method documents its behaviour.</p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author Moritz Petersen
  * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>

src/main/java/org/apache/commons/lang3/BooleanUtils.java

@@ -25,6 +25,7 @@
  * An exception will not be thrown for a <code>null</code> input.
  * Each method documents its behaviour in more detail.</p>
  * 
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author Matthew Hawthorne
  * @author Gary Gregory

src/main/java/org/apache/commons/lang3/CharSetUtils.java

@@ -23,6 +23,7 @@
  * An exception will not be thrown for a <code>null</code> input.
  * Each method documents its behaviour in more detail.</p>
  * 
+ * <p>#ThreadSafe#
  * @see CharSet
  * @author Apache Software Foundation
  * @author Phil Steitz

src/main/java/org/apache/commons/lang3/CharUtils.java

@@ -23,6 +23,7 @@
  * An exception will not be thrown for a <code>null</code> input.
  * Each method documents its behaviour in more detail.</p>
  * 
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @since 2.1
  * @version $Id$

src/main/java/org/apache/commons/lang3/EnumUtils.java

@@ -25,6 +25,7 @@
 /**
  * Utility library to provide helper methods for Java enums.
  * 
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  */
 public class EnumUtils {

src/main/java/org/apache/commons/lang3/ObjectUtils.java

@@ -29,6 +29,7 @@
  * An exception will generally not be thrown for a <code>null</code> input.
  * Each method documents its behaviour in more detail.</p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a>
  * @author <a href="mailto:janekdb@yahoo.co.uk">Janek Bogucki</a>

src/main/java/org/apache/commons/lang3/Pair.java

@@ -22,6 +22,8 @@
 
 /**
  * A basic immutable Object pair.
+ *
+ * <p>#ThreadSafe#
  * @since Lang 3.0
  * @author Matt Benson
  */

src/main/java/org/apache/commons/lang3/RandomStringUtils.java

@@ -28,6 +28,7 @@
  * 56320 (dc00) to 57343 (dfff) then it is placed after a randomly 
  * chosen high surrogate. </p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author <a href="mailto:steven@caswell.name">Steven Caswell</a>
  * @author Gary Gregory

src/main/java/org/apache/commons/lang3/SerializationUtils.java

@@ -38,6 +38,7 @@
  * <p>This class throws exceptions for invalid <code>null</code> inputs.
  * Each method documents its behaviour in more detail.</p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a>
  * @author <a href="mailto:janekdb@yahoo.co.uk">Janek Bogucki</a>

src/main/java/org/apache/commons/lang3/StringEscapeUtils.java

@@ -31,6 +31,7 @@
  * <p>Escapes and unescapes <code>String</code>s for
  * Java, Java Script, HTML and XML.</p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author Apache Jakarta Turbine
  * @author Purple Technology

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -99,6 +99,7 @@
  * <p>Methods in this class give sample code to explain their operation.
  * The symbol <code>*</code> is used to indicate any input including <code>null</code>.</p>
  *
+ * <p>#ThreadSafe#
  * @see java.lang.String
  * @author Apache Software Foundation
  * @author <a href="http://jakarta.apache.org/turbine/">Apache Jakarta Turbine</a>

src/main/java/org/apache/commons/lang3/SystemUtils.java

@@ -25,6 +25,7 @@
  * the corresponding field in this class will be set to <code>null</code>
  * and a message will be written to <code>System.err</code>.</p>
  *
+ * <p>#ThreadSafe#
  * @author Apache Software Foundation
  * @author Based on code from Avalon Excalibur
  * @author Based on code from Lucene