CompressionInputStream.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.InputStream;
- /**
- * A compression input stream.
- *
- * <p>Implementations are assumed to be buffered. This permits clients to
- * reposition the underlying input stream then call {@link #resetState()},
- * without having to also synchronize client buffers.
- */
- public abstract class CompressionInputStream extends InputStream {
- /**
- * The input stream to be compressed.
- */
- protected final InputStream in;
- /**
- * Create a compression input stream that reads
- * the decompressed bytes from the given stream.
- *
- * @param in The input stream to be compressed.
- */
- protected CompressionInputStream(InputStream in) {
- this.in = in;
- }
- public void close() throws IOException {
- in.close();
- }
-
- /**
- * Read bytes from the stream.
- * Made abstract to prevent leakage to underlying stream.
- */
- public abstract int read(byte[] b, int off, int len) throws IOException;
- /**
- * Reset the decompressor to its initial state and discard any buffered data,
- * as the underlying stream may have been repositioned.
- */
- public abstract void resetState() throws IOException;
-
- }