CompressionOutputStream.java
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上传日期:2018-01-08
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文件大小:2k
- /*
- * 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.compress;
- import java.io.IOException;
- import java.io.OutputStream;
- /**
- * A compression output stream.
- */
- public abstract class CompressionOutputStream extends OutputStream {
- /**
- * The output stream to be compressed.
- */
- protected final OutputStream out;
-
- /**
- * Create a compression output stream that writes
- * the compressed bytes to the given stream.
- * @param out
- */
- protected CompressionOutputStream(OutputStream out) {
- this.out = out;
- }
-
- public void close() throws IOException {
- finish();
- out.close();
- }
-
- public void flush() throws IOException {
- out.flush();
- }
-
- /**
- * Write compressed bytes to the stream.
- * Made abstract to prevent leakage to underlying stream.
- */
- public abstract void write(byte[] b, int off, int len) throws IOException;
- /**
- * Finishes writing compressed data to the output stream
- * without closing the underlying stream.
- */
- public abstract void finish() throws IOException;
-
- /**
- * Reset the compression to the initial state.
- * Does not reset the underlying stream.
- */
- public abstract void resetState() throws IOException;
- }