javax.mail.internet.SharedInputStream.java Source code

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * Modifications:
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 */

package javax.mail.internet;

import java.io.*;

/**
 * An InputStream that is backed by data that can be shared by multiple
 * readers may implement this interface.  This allows users of such an
 * InputStream to determine the current position in the InputStream, and
 * to create new InputStreams representing a subset of the data in the
 * original InputStream.  The new InputStream will access the same
 * underlying data as the original, without copying the data. <p>
 *
 * Note that implementations of this interface must ensure that the
 * <code>close</code> method does not close any underlying stream
 * that might be shared by multiple instances of <code>SharedInputStream</code>
 * until all shared instances have been closed.
 *
 * @author  Bill Shannon
 * @since JavaMail 1.2
 */

public interface SharedInputStream {
    /**
     * Return the current position in the InputStream, as an
     * offset from the beginning of the InputStream.
     *
     * @return   the current position
     */
    public long getPosition();

    /**
     * Return a new InputStream representing a subset of the data
     * from this InputStream, starting at <code>start</code> (inclusive)
     * up to <code>end</code> (exclusive).  <code>start</code> must be
     * non-negative.  If <code>end</code> is -1, the new stream ends
     * at the same place as this stream.  The returned InputStream
     * will also implement the SharedInputStream interface.
     *
     * @param   start   the starting position
     * @param   end   the ending position + 1
     * @return      the new stream
     */
    public InputStream newStream(long start, long end);
}