Slice out byte[] printer
Change-Id: I095575df5f03057c386be77328897be59c96eaf9
diff --git a/utils/misc/src/main/java/org/onlab/util/ByteArraySizeHashPrinter.java b/utils/misc/src/main/java/org/onlab/util/ByteArraySizeHashPrinter.java
new file mode 100644
index 0000000..cc39ce2
--- /dev/null
+++ b/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();
+ }
+}
diff --git a/utils/misc/src/test/java/org/onlab/util/ByteArraySizeHashPrinterTest.java b/utils/misc/src/test/java/org/onlab/util/ByteArraySizeHashPrinterTest.java
new file mode 100644
index 0000000..e3a5e94
--- /dev/null
+++ b/utils/misc/src/test/java/org/onlab/util/ByteArraySizeHashPrinterTest.java
@@ -0,0 +1,53 @@
+/*
+ * 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 static org.junit.Assert.*;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+
+/**
+ * Test cases for byte[] pretty printer.
+ */
+public class ByteArraySizeHashPrinterTest {
+
+ /**
+ * Test method for {@link org.onlab.util.ByteArraySizeHashPrinter#toString()}.
+ */
+ @Test
+ public void testToStringNull() {
+ final byte[] none = null;
+
+ assertEquals("byte[]{null}", String.valueOf(ByteArraySizeHashPrinter.of(none)));
+ assertNull(ByteArraySizeHashPrinter.orNull(none));
+ }
+
+ /**
+ * Test method for {@link org.onlab.util.ByteArraySizeHashPrinter#toString()}.
+ */
+ @Test
+ public void testToString() {
+ final byte[] some = new byte[] {2, 5, 0, 1 };
+ final String expected = "byte[]{length=" + some.length + ", hash=" + Arrays.hashCode(some) + "}";
+
+ assertEquals(expected, String.valueOf(ByteArraySizeHashPrinter.of(some)));
+ assertNotNull(ByteArraySizeHashPrinter.orNull(some));
+ }
+
+}