1 files changed, 90 insertions, 0 deletions
diff --git a/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/type/Symbol.java b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/type/Symbol.java
new file mode 100644
index 0000000000..6efcdcf952
--- /dev/null
+++ b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/type/Symbol.java
@@ -0,0 +1,90 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+package org.apache.qpid.amqp_1_0.type;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+public final class Symbol implements Comparable<Symbol>, CharSequence
+{
+    private final String _underlying;
+    private static final ConcurrentHashMap<String, Symbol> _symbols = new ConcurrentHashMap<String, Symbol>(2048);
+
+    private Symbol(String underlying)
+    {
+        _underlying = underlying;
+    }
+
+    public int length()
+    {
+        return _underlying.length();
+    }
+
+    public int compareTo(Symbol o)
+    {
+        return _underlying.compareTo(o._underlying);
+    }
+
+    public char charAt(int index)
+    {
+        return _underlying.charAt(index);
+    }
+
+    public CharSequence subSequence(int beginIndex, int endIndex)
+    {
+        return _underlying.subSequence(beginIndex, endIndex);
+    }
+
+    @Override
+    public String toString()
+    {
+        return _underlying;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return _underlying.hashCode();
+    }
+
+    public static Symbol valueOf(String symbolVal)
+    {
+        return getSymbol(symbolVal);
+    }
+
+    public static Symbol getSymbol(String symbolVal)
+    {
+        Symbol symbol = _symbols.get(symbolVal);
+        if(symbol == null)
+        {
+            symbolVal = symbolVal.intern();
+            symbol = new Symbol(symbolVal);
+            Symbol existing;
+            if((existing = _symbols.putIfAbsent(symbolVal, symbol)) != null)
+            {
+                symbol = existing;
+            }
+        }
+        return symbol;
+    }
+
+
+}