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/*
 *
 * Copyright (c) 2008 Elias Ross
 *
 * 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 com.nothome.delta.text;

import java.io.IOException;
import java.nio.CharBuffer;

/**
 * Wrapper for a {@link CharBuffer}.
 */
public class CharBufferSeekableSource implements SeekableSource {
  /** The cb. */
  private CharBuffer cb;
  /** The cur. */
  private CharBuffer cur;

  /**
   * Constructs a new CharBufferSeekableSource.
   *
   * @param cb the cb
   */
  public CharBufferSeekableSource(CharBuffer cb) {
    if (cb == null)
      throw new NullPointerException("cb");
    this.cb = cb;
    try {
      seek(0);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

  /**
   * Constructs a new CharBufferSeekableSource from a char sequence (String).
   *
   * @param seq the seq
   */
  public CharBufferSeekableSource(CharSequence seq) {
    this(CharBuffer.wrap(seq));
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.text.SeekableSource#seek(long)
   */
  @Override
  public void seek(long pos) throws IOException {
    cb.rewind();
    cur = cb.slice();
    if (pos > cur.limit())
      throw new IOException("pos " + pos + " cannot seek " + cur.limit());
    cur.position((int) pos);
  }

  /* (non-Javadoc)
   * @see java.lang.Readable#read(java.nio.CharBuffer)
   */
  @Override
  public int read(CharBuffer charbuffer) throws IOException {
    return cur.read(charbuffer);
  }

  /* (non-Javadoc)
   * @see java.io.Closeable#close()
   */
  @Override
  public void close() throws IOException {}
}