TestWritableUtils.java
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上传日期:2018-01-08
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- /**
- * 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.hadoop.io;
- import java.io.IOException;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import junit.framework.TestCase;
- public class TestWritableUtils extends TestCase {
- private static final Log LOG = LogFactory.getLog(TestWritableUtils.class);
- public static void testValue(int val, int vintlen) throws IOException {
- DataOutputBuffer buf = new DataOutputBuffer();
- DataInputBuffer inbuf = new DataInputBuffer();
- WritableUtils.writeVInt(buf, val);
- if (LOG.isDebugEnabled()) {
- LOG.debug("Value = " + val);
- BytesWritable printer = new BytesWritable();
- printer.set(buf.getData(), 0, buf.getLength());
- LOG.debug("Buffer = " + printer);
- }
- inbuf.reset(buf.getData(), 0, buf.getLength());
- assertEquals(val, WritableUtils.readVInt(inbuf));
- assertEquals(vintlen, buf.getLength());
- assertEquals(vintlen, WritableUtils.getVIntSize(val));
- assertEquals(vintlen, WritableUtils.decodeVIntSize(buf.getData()[0]));
- }
- public static void testVInt() throws Exception {
- testValue(12, 1);
- testValue(127, 1);
- testValue(-112, 1);
- testValue(-113, 2);
- testValue(-128, 2);
- testValue(128, 2);
- testValue(-129, 2);
- testValue(255, 2);
- testValue(-256, 2);
- testValue(256, 3);
- testValue(-257, 3);
- testValue(65535, 3);
- testValue(-65536, 3);
- testValue(65536, 4);
- testValue(-65537, 4);
- }
- }