package org.kuali.common.util.xml.jaxb.adapter;
   
   import javax.xml.bind.annotation.adapters.XmlAdapter;
   
   import org.kuali.common.util.Assert;
   import org.kuali.common.util.Str;
   
   import com.google.common.base.Optional;
   
  public final class FlattenOptionalStringAdapter extends XmlAdapter<String, Optional<String>> {
  
  	public FlattenOptionalStringAdapter() {
  		this(FlattenConstants.DEFAULT_CR_REPLACEMENT, FlattenConstants.DEFAULT_LF_REPLACEMENT);
  	}
  
  	public FlattenOptionalStringAdapter(String carriageReturnReplacement, String linefeedReplacement) {
  		// No blanks because this needs to work in both directions (flatten + inflate)
  		Assert.noBlanks(carriageReturnReplacement, linefeedReplacement);
  		this.carriageReturnReplacement = carriageReturnReplacement;
  		this.linefeedReplacement = linefeedReplacement;
  	}
  
  	private final String carriageReturnReplacement;
  	private final String linefeedReplacement;
  
  	@Override
  	public String marshal(Optional<String> optional) {
  		if (optional.isPresent()) {
  			return Str.flatten(optional.get(), carriageReturnReplacement, linefeedReplacement);
  		} else {
  			return null;
  		}
  	}
  
  	@Override
  	public Optional<String> unmarshal(String value) {
  		if (value == null) {
  			return Optional.<String> absent();
  		} else {
  			return Optional.<String> of(Str.inflate(value, carriageReturnReplacement, linefeedReplacement));
  		}
  	}
  
  	public String getCarriageReturnReplacement() {
  		return carriageReturnReplacement;
  	}
  
  	public String getLinefeedReplacement() {
  		return linefeedReplacement;
  	}
  
  }