/**
    * Copyright 2010-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.common.util.xml.jaxb.adapter;
  
  import javax.xml.bind.annotation.adapters.XmlAdapter;
  
  import org.kuali.common.util.Assert;
  
  public abstract class OmitStringAdapter extends XmlAdapter<String, String> {
  
  	public OmitStringAdapter(String omitString) {
  		Assert.notNull(omitString);
  		this.omitString = omitString;
  	}
  
  	private final String omitString;
  
  	@Override
  	public final String marshal(String string) {
  		if (omitString.equals(string)) {
  			return null;
  		} else {
  			return string;
  		}
  	}
  
  	@Override
  	public final String unmarshal(String string) {
  		if (string == null) {
  			return omitString;
  		} else {
  			return string;
  		}
  	}
  
  	public final String getOmitString() {
  		return omitString;
  	}
  
  }