1 files changed, 69 insertions, 0 deletions
diff --git a/framework/src/onos/utils/misc/src/main/java/org/onlab/util/ByteArraySizeHashPrinter.java b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/ByteArraySizeHashPrinter.java
new file mode 100644
index 00000000..cc39ce28
--- /dev/null
+++ b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/ByteArraySizeHashPrinter.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * Licensed 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.onlab.util;
+
+import java.util.Arrays;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.MoreObjects.ToStringHelper;
+
+/**
+ * Helper to print byte[] length and hashCode.
+ */
+public final class ByteArraySizeHashPrinter {
+
+    private final byte[] bytes;
+
+    /**
+     * Returns ByteArraySizeHashPrinter wrapping given byte[].
+     *
+     * @param bytes bytes to wrap around
+     * @return ByteArraySizeHashPrinter
+     */
+    public static ByteArraySizeHashPrinter of(byte[] bytes) {
+        return new ByteArraySizeHashPrinter(bytes);
+    }
+
+    /**
+     * Returns ByteArraySizeHashPrinter wrapping given byte[].
+     *
+     * @param bytes bytes to wrap around
+     * @return null if {@code bytes == null}, ByteArraySizeHashPrinter otherwise
+     */
+    public static ByteArraySizeHashPrinter orNull(byte[] bytes) {
+        if (bytes == null) {
+            return null;
+        }
+        return new ByteArraySizeHashPrinter(bytes);
+    }
+
+    public ByteArraySizeHashPrinter(byte[] bytes) {
+        this.bytes = bytes;
+    }
+
+    @Override
+    public String toString() {
+        ToStringHelper helper = MoreObjects.toStringHelper("byte[]");
+        if (bytes != null) {
+            helper.add("length", bytes.length)
+                  .add("hash", Arrays.hashCode(bytes));
+        } else {
+            helper.addValue(bytes);
+        }
+        return helper.toString();
+    }
+}