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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