/*
 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.lang;

import java.io.IOException;

/**
 * A <tt>Readable</tt> is a source of characters. Characters from
 * a <tt>Readable</tt> are made available to callers of the read
 * method via a {@link java.nio.CharBuffer CharBuffer}.
 *
 * @since 1.5
 */
public interface Readable {

 /**
 * Attempts to read characters into the specified character buffer.
 * The buffer is used as a repository of characters as-is: the only
 * changes made are the results of a put operation. No flipping or
 * rewinding of the buffer is performed.
 *
 * @param cb the buffer to read characters into
 * @return The number of {@code char} values added to the buffer,
 * or -1 if this source of characters is at its end
 * @throws IOException if an I/O error occurs
 * @throws NullPointerException if cb is null
 * @throws java.nio.ReadOnlyBufferException if cb is a read only buffer
 */
 public int read(java.nio.CharBuffer cb) throws IOException;
}