1 files changed, 122 insertions, 0 deletions
diff --git a/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/codec/FixedFourWriter.java b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/codec/FixedFourWriter.java
new file mode 100644
index 0000000000..164a869299
--- /dev/null
+++ b/qpid/java/amqp-1-0-common/src/main/java/org/apache/qpid/amqp_1_0/codec/FixedFourWriter.java
@@ -0,0 +1,122 @@
+/*
+ *
+ * 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.codec;
+
+import java.nio.ByteBuffer;
+
+public abstract class FixedFourWriter<T extends Object> implements ValueWriter<T>
+{
+    private int _written = 5;
+    private int _value;
+
+    public final int writeToBuffer(ByteBuffer buffer)
+    {
+        int remaining = buffer.remaining();
+        int written = _written;
+        switch(written)
+        {
+            case 0:
+                if(remaining-- != 0)
+                {
+                    buffer.put(getFormatCode());
+                    written = 1;
+                }
+                else
+                {
+                    break;
+                }
+            case 1:
+                if(remaining>=4)
+                {
+                    buffer.putInt(_value);
+                    written = 5;
+                    break;
+                }
+                else if(remaining-- != 0)
+                {
+                    buffer.put((byte)((_value >> 24)&0xFF));
+                    written = 2;
+                }
+                else
+                {
+                    break;
+                }
+            case 2:
+                if(remaining-- != 0)
+                {
+                    buffer.put((byte)((_value >> 16)&0xFF));
+                    written = 3;
+                }
+                else
+                {
+                    break;
+                }
+            case 3:
+                if(remaining-- != 0)
+                {
+                    buffer.put((byte)((_value >> 8)&0xFF));
+                    written = 4;
+                }
+                else
+                {
+                    break;
+                }
+            case 4:
+                if(remaining-- != 0)
+                {
+                    buffer.put((byte)(_value&0xFF));
+                    written = 5;
+                }
+
+        }
+        _written = written;
+
+        return 5;
+    }
+
+    abstract byte getFormatCode();
+
+    public final void setValue(T value)
+    {
+        if(_written==1)
+        {
+            // TODO - remove
+            System.out.println("Remove");
+        }
+        _written = 0;
+        _value = convertValueToInt(value);
+    }
+
+    abstract int convertValueToInt(T value);
+
+    public boolean isCacheable()
+    {
+        return true;
+    }
+
+    public final boolean isComplete()
+    {
+        return _written == 5;
+    }
+
+
+}
+\ No newline at end of file