text: /* ###
   * IP: GHIDRA
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package ghidra.app.util.viewer.util;
  
  import java.math.BigInteger;
  
  import docking.widgets.fieldpanel.listener.IndexMapper;
  import ghidra.program.model.address.Address;
  
  /** Implementation of IndexMapper that uses an old and new AddressIndexMap to map indexes 
   *  when the AddressIndexMap changes. 
   */
  public class AddressBasedIndexMapper implements IndexMapper {
  
  	private AddressIndexMap from;
  	private AddressIndexMap to;
  
  	public AddressBasedIndexMapper(AddressIndexMap from, AddressIndexMap to) {
  		this.from = from;
  		this.to = to;
  	}
  
  	@Override
  	public BigInteger map(BigInteger value) {
  		Address address = from.getAddress(value);
  		if (address == null) {
  			return BigInteger.ZERO;
  		}
  		BigInteger mapped = to.getIndex(address);
  		return mapped != null ? mapped : BigInteger.ZERO;
  	}
  }
  