BaseDemoInputBuffer.java

/*
  BaseDemoInputBuffer.java

  (c) 2012-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.engine.demos.stream;

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

import v9t9.common.demos.IDemoInputBuffer;

/**
 * @author ejs
 *
 */
public abstract class BaseDemoInputBuffer implements IDemoInputBuffer {

	protected final InputStream is;
	protected final String label;
	protected long startPos;

	/**
	 * 
	 */
	public BaseDemoInputBuffer(InputStream is, String label) {
		this.is = is;
		this.label = label;
	}


	protected IOException newFormatException(String string) {
		return newFormatException(string, startPos);
	}

	protected IOException newFormatException(String string, long effectivePos) {
		return new IOException("Demo corrupted at 0x" + 
				Long.toHexString(effectivePos) + ": " + string);

	}
	
	public IOException newBufferException(String string) {
		return newFormatException(string, getEffectivePos());
	}


}