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From nor...@apache.org
Subject svn commit: r1228297 - /james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java
Date Fri, 06 Jan 2012 17:40:38 GMT
Author: norman
Date: Fri Jan  6 17:40:38 2012
New Revision: 1228297

URL: http://svn.apache.org/viewvc?rev=1228297&view=rev
Log:
Use zero-copy if possible

Added:
    james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java

Added: james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java
URL: http://svn.apache.org/viewvc/james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java?rev=1228297&view=auto
==============================================================================
--- james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java
(added)
+++ james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/CombinedInputStream.java
Fri Jan  6 17:40:38 2012
@@ -0,0 +1,80 @@
+/****************************************************************
+ * 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.james.protocols.api;
+
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * {@link SequenceInputStream} sub-class which allows direct access to the pair of {@link
InputStream}'s.
+ * 
+ * When ever you need to "combine" two {@link InputStream}'s you should use this class as
it may allow the Transport to optimize the transfer of it!
+ * 
+ *
+ */
+public class CombinedInputStream extends SequenceInputStream implements Iterable<InputStream>{
+
+    private final InputStream[] streams;
+
+    public CombinedInputStream(InputStream s1, InputStream s2) {
+        super(s1, s2);
+        streams = new InputStream[] {s1, s2};
+    }
+
+    /*
+     * (non-Javadoc)
+     * @see java.lang.Iterable#iterator()
+     */
+    public Iterator<InputStream> iterator() {
+        return new Iterator<InputStream>() {
+            private int count = 0;
+           
+            /*
+             * (non-Javadoc)
+             * @see java.util.Iterator#hasNext()
+             */
+            public boolean hasNext() {
+                return count < streams.length;
+            }
+
+            /*
+             * (non-Javadoc)
+             * @see java.util.Iterator#next()
+             */
+            public InputStream next() {
+                if (hasNext())  {
+                    return streams[count++];
+                } else {
+                    throw new NoSuchElementException();
+                }
+            }
+            
+            /**
+             * Read-Only
+             */
+            public void remove() {
+                throw new UnsupportedOperationException("Read-Only");
+            }
+        };
+    }
+
+}



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