init

java/org/apache/tomcat/util/buf/ByteBufferHolder.java

@@ -0,0 +1,55 @@
+/*
+ *  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.tomcat.util.buf;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Simple wrapper for a {@link ByteBuffer} that remembers if the buffer has been
+ * flipped or not.
+ */
+public class ByteBufferHolder {
+
+    private final ByteBuffer buf;
+    private final AtomicBoolean flipped;
+
+    public ByteBufferHolder(ByteBuffer buf, boolean flipped) {
+       this.buf = buf;
+       this.flipped = new AtomicBoolean(flipped);
+    }
+
+
+    public ByteBuffer getBuf() {
+        return buf;
+    }
+
+
+    public boolean isFlipped() {
+        return flipped.get();
+    }
+
+
+    public boolean flip() {
+        if (flipped.compareAndSet(false, true)) {
+            buf.flip();
+            return true;
+        } else {
+            return false;
+        }
+    }
+}