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package org.eclipse.debug.core.model;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import org.eclipse.debug.core.DebugException;
 
/**
 * Supports the retrieval of arbitrary blocks of memory.
 * 
 * @see IMemoryBlock
 * @since 2.0
 */
public interface IMemoryBlockRetrieval {
	
	/**
	 * Returns whether this debug target supports the retrieval
	 * of memory blocks.
	 * 
	 * @return whether this debug target supports the retrieval
	 *  of memory blocks
	 */
	public boolean supportsStorageRetrieval();
	
	/**
	 * Returns a memory block that starts at the specified
	 * memory address, with the specified length.
	 * 
	 * @param startAddress starting address
	 * @param length length of the memory block in bytes
	 * @return a memory block that starts at the specified
	 *  memory address, with the specified length
	 * @exception DebugException if this method fails.  Reasons include:
	 * <ul><li>Failure communicating with the debug target.  The DebugException's
	 * status code contains the underlying exception responsible for
	 * the failure.</li>
	 * <li>This debug target does not support memory block retrieval</li>
	 * <li>The specified address and length are not within valid
	 *  ranges</li>
	 * </ul>
	 */
	public IMemoryBlock getMemoryBlock(long startAddress, long length) throws DebugException;
}

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