1 files changed, 110 insertions, 0 deletions
diff --git a/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/transport/SequenceNumber.java b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/transport/SequenceNumber.java
new file mode 100644
index 0000000000..3f6490c2aa
--- /dev/null
+++ b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/transport/SequenceNumber.java
@@ -0,0 +1,110 @@
+/*
+ *
+ * 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.transport;
+
+public class SequenceNumber implements Comparable<SequenceNumber>, Cloneable
+{
+    private int _seqNo;
+
+    public SequenceNumber(int seqNo)
+    {
+        _seqNo = seqNo;
+    }
+
+    public SequenceNumber incr()
+    {
+        _seqNo++;
+        return this;
+    }
+
+    public SequenceNumber decr()
+    {
+        _seqNo--;
+        return this;
+    }
+
+    public static SequenceNumber add(SequenceNumber a, int i)
+    {
+        return a.clone().add(i);
+    }
+
+    public static SequenceNumber subtract(SequenceNumber a, int i)
+    {
+        return a.clone().add(-i);
+    }
+
+    private SequenceNumber add(int i)
+    {
+        _seqNo+=i;
+        return this;
+    }
+
+    @Override
+    public boolean equals(Object o)
+    {
+        if (this == o)
+        {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass())
+        {
+            return false;
+        }
+
+        SequenceNumber that = (SequenceNumber) o;
+
+        if (_seqNo != that._seqNo)
+        {
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return _seqNo;
+    }
+
+    public int compareTo(SequenceNumber o)
+    {
+        return _seqNo - o._seqNo;
+    }
+
+    @Override
+    public SequenceNumber clone()
+    {
+        return new SequenceNumber(_seqNo);
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SN{" + _seqNo + '}';
+    }
+
+    public int intValue()
+    {
+        return _seqNo;
+    }
+}