| /** |
| * 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.oozie.util; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class TestByteArrayUtils { |
| |
| @Test |
| public void testByteArrayInterningGivesSameInstances() { |
| final int byteArrayCount = 1000; |
| final int elementCount = 100; |
| final byte[][] sameContent = new byte[byteArrayCount][]; |
| |
| for (int i = 0; i < byteArrayCount; i++) { |
| final byte[] source = new byte[elementCount]; |
| sameContent[i] = source; |
| for (int j = 0; j < elementCount; j++) { |
| source[j] = (byte) j; |
| } |
| } |
| |
| for (int i = 1; i < byteArrayCount; i++) { |
| Assert.assertTrue("copied byte[]s should be another instances", sameContent[i - 1] != sameContent[i]); |
| } |
| |
| final byte[][] interned = new byte[byteArrayCount][]; |
| for (int i = 0; i < byteArrayCount; i++) { |
| interned[i] = ByteArrayUtils.weakIntern(sameContent[i]); |
| } |
| |
| for (int i = 1; i < byteArrayCount; i++) { |
| Assert.assertTrue("weak interned byte[]s should be the same instance", interned[i - 1] == interned[i]); |
| } |
| } |
| } |