htsjdk.tribble.readers.Positional Maven / Gradle / Ivy

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/*
 * The MIT License
 *
 * Copyright (c) 2013 The Broad Institute
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package htsjdk.tribble.readers;

import htsjdk.samtools.util.LocationAware;

import java.io.IOException;

/**
 * Minimal interface for an object at support getting the current position in the stream / writer / file, as well as a handful of other
 * reader-like features.
 * 
 * @author depristo
 */
public interface Positional extends LocationAware {
    /**
     * Is the stream done?  Equivalent to ! hasNext() for an iterator?
     * @return true if the stream has reached EOF, false otherwise
     */
    public boolean isDone() throws IOException;

    /**
     * Skip the next nBytes in the stream.
     * @param nBytes to skip, must be >= 0
     * @return the number of bytes actually skippped.
     * @throws IOException
     */
    public long skip(long nBytes) throws IOException;

    /**
     * Return the next byte in the first, without actually reading it from the stream.
     *
     * Has the same output as read()
     *
     * @return the next byte, or -1 if EOF encountered
     * @throws IOException
     */
    public int peek() throws IOException;
}