/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.classfile;

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

/**
 * Object representing a resource in a code base.
 * 
 * @author David Hovemeyer
 */
public interface ICodeBaseEntry {
	/**
	 * Get the name of the resource.
	 * 
	 * @return the name of the resource
	 */
	public String getResourceName();

	/**
	 * Get the number of bytes in the resource.
	 * Returns &lt;0 if the number of bytes is not known.
	 * 
	 * @return number of bytes in the resource, or &lt;0 if not known. 
	 */
	public int getNumBytes();

	/**
	 * Open an input stream reading from the resource.
	 * 
	 * @return InputStream reading from the resource.
	 * @throws IOException if an error occurs reading from the resource
	 */
	public InputStream openResource() throws IOException;

	/**
	 * Get the codebase this codebase entry belongs to.
	 * 
	 * @return the codebase this codebase entry belongs to
	 */
	public ICodeBase getCodeBase();

	/**
	 * Return the ClassDescriptor of the class resource accessed
	 * by this codebase entry.  Do not call this method unless
	 * ClassDescriptor.isClassResource() returns true.
	 * This method may require the class data to be loaded
	 * in order to determine the class.
	 * 
	 * @return ClassDescriptor of this entry
	 * @throws CheckedAnalysisException if the codebase entry does not reference a valid classfile
	 * @throws IllegalArgumentException if the codebase entry's filename is definitely not a classfile
	 */
	public ClassDescriptor getClassDescriptor() throws ResourceNotFoundException, InvalidClassFileFormatException;

	/**
	 * Override the resource name of this codebase entry.
	 * 
	 * @param resourceName the new resource name
	 */
	public void overrideResourceName(String resourceName);
}
