001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.io;
031
032import java.io.InputStream;
033
034/**
035 * Interface for classes capable of reading objects from a {@link InputStream}.
036 * 
037 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
038 * 
039 * @param <T>
040 *            Type of object being read.
041 */
042public interface InputStreamObjectReader<T> extends ObjectReader<T, InputStream> {
043        /**
044         * Returns true if the stream can be read, or false otherwise.
045         * <p>
046         * Typically implementations will read just the first few bytes from the
047         * stream to determine if the data can be read. This method is not normally
048         * called directly; rather,
049         * {@link IOUtils#canRead(InputStreamObjectReader, java.io.BufferedInputStream, String)}
050         * should be used instead as it is capable of resetting the stream to its
051         * initial condition.
052         * 
053         * @see IOUtils#canRead(InputStreamObjectReader,
054         *      java.io.BufferedInputStream, String)
055         * 
056         * @param stream
057         *            the input stream
058         * @param name
059         *            the name of the file behind the stream (can be null).
060         * @return true if this {@link InputStreamObjectReader} can read the stream;
061         *         false otherwise.
062         */
063        @Override
064        public boolean canRead(InputStream stream, String name);
065}