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package org.scijava.io.handle;

import java.io.IOException;
import java.io.InputStream;

import org.scijava.io.location.Location;

/**
 * {@link InputStream} backed by a {@link DataHandle}.
 * 
 * @author Curtis Rueden
 * @author Melissa Linkert
 */
public class DataHandleInputStream extends InputStream {

	// -- Fields --

	private final DataHandle handle;

	private long mark = -1;

	// -- Constructors --

	/** Creates an input stream around the given {@link DataHandle}. */
	public DataHandleInputStream(final DataHandle handle) {
		this.handle = handle;
	}

	// -- DataHandleInputStream methods --

	public DataHandle getDataHandle() {
		return handle;
	}

	// -- InputStream methods --

	@Override
	public int read() throws IOException {
		return handle.read();
	}

	@Override
	public int read(final byte[] array, final int offset, final int n)
		throws IOException
	{
		return handle.read(array, offset, n);
	}

	@Override
	public long skip(final long n) throws IOException {
		return handle.skip(n);
	}

	@Override
	public int available() throws IOException {
		long remain = handle.length() - handle.offset();
		if (remain > Integer.MAX_VALUE) remain = Integer.MAX_VALUE;
		return (int) remain;
	}

	@Override
	public synchronized void mark(final int readLimit) {
		try {
			mark = handle.offset();
		}
		catch (final IOException exc) {
			throw new IllegalStateException(exc);
		}
	}

	@Override
	public synchronized void reset() throws IOException {
		if (mark < 0) throw new IOException("No mark set");
		handle.seek(mark);
	}

	@Override
	public boolean markSupported() {
		return true;
	}

	// -- Closeable methods --

	@Override
	public void close() throws IOException {
		handle.close();
		mark = -1;
	}

}