[cooja] memory: Implementation of simple array-backed memory class 'ArrayMamory'

This commit is contained in:
Enrico Joerns 2014-07-29 13:50:14 +02:00
parent f6a0f54424
commit 070e0ba0fc

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/*
* Copyright (c) 2013, Enrico Joerns
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
package org.contikios.cooja.mote.memory;
import java.util.Arrays;
import java.util.Map;
/**
* A memory that is backed by an array.
*
* @author Enrico Joerns
*/
public class ArrayMemory implements MemoryInterface {
private final byte memory[];
private final long startAddress;
private final MemoryLayout layout;
private final boolean readonly;
private final Map<String, Symbol> symbols;// XXX Allow to set symbols
public ArrayMemory(long address, int size, MemoryLayout layout, Map<String, Symbol> symbols) {
this(address, layout, new byte[size], symbols);
}
public ArrayMemory(long address, MemoryLayout layout, byte[] memory, Map<String, Symbol> symbols) {
this(address, layout, memory, false, symbols);
}
public ArrayMemory(long address, MemoryLayout layout, byte[] memory, boolean readonly, Map<String, Symbol> symbols) {
this.startAddress = address;
this.layout = layout;
this.memory = memory;
this.readonly = readonly;
this.symbols = symbols;
}
@Override
public byte[] getMemory() {
return memory;
}
/**
* XXX Should addr be the relative or the absolute address of this section?
* @param addr
* @param size
* @return
* @throws org.contikios.cooja.mote.memory.MemoryInterface.MoteMemoryException
*/
@Override
public byte[] getMemorySegment(long addr, int size) throws MoteMemoryException {
byte[] ret = new byte[size];
System.arraycopy(memory, (int) (addr - startAddress), ret, 0, size);
return ret;
}
@Override
public void setMemorySegment(long addr, byte[] data) throws MoteMemoryException {
if (readonly) {
throw new MoteMemoryException("Invalid write access for readonly memory");
}
System.arraycopy(data, 0, memory, (int) (addr - startAddress), data.length);
}
@Override
public void clearMemory() {
Arrays.fill(memory, (byte) 0x00);
}
@Override
public long getStartAddr() {
return startAddress;
}
@Override
public int getTotalSize() {
return memory.length;
}
@Override
public Map<String, Symbol> getSymbolMap() {
return symbols;
}
@Override
public MemoryLayout getLayout() {
return layout;
}
@Override
public boolean addSegmentMonitor(SegmentMonitor.EventType flag, long address, int size, SegmentMonitor monitor) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean removeSegmentMonitor(long address, int size, SegmentMonitor monitor) {
throw new UnsupportedOperationException("Not supported yet.");
}
}