/**
    * 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.spring.format;
  
  import java.util.Locale;
  
  import org.kuali.common.util.base.string.Replacer;
  import org.springframework.format.Formatter;
  
  public final class CsvStringFormatter implements Formatter<String> {
  
  	private final String nullToken;
  	private final String emptyToken;
  	private final Replacer replacer;
  
  	@Override
  	public String print(String string, Locale locale) {
  		if (string == null) {
  			return nullToken;
  		} else if (string.equals("")) {
  			return emptyToken;
  		} else {
  			return replacer.replace(string);
  		}
  
  	}
  
  	@Override
  	public String parse(String string, Locale locale) {
  		if (nullToken.equals(string)) {
  			return null;
  		} else if (emptyToken.equals(string)) {
  			return "";
  		} else {
  			return replacer.restore(string);
  		}
  	}
  
  	private CsvStringFormatter(Builder builder) {
  		this.nullToken = builder.nullToken;
  		this.emptyToken = builder.emptyToken;
  		this.replacer = builder.replacer;
  	}
  
  	public static CsvStringFormatter create() {
  		return builder().build();
  	}
  
  	public static Builder builder() {
  		return new Builder();
  	}
  
  	public static class Builder implements org.apache.commons.lang3.builder.Builder<CsvStringFormatter> {
  
  		private String nullToken = "${csv.null}";
  		private String emptyToken = "${csv.empty}";
  		private Replacer replacer = Replacer.builder().add("\r", "${csv.cr}").add("\n", "${csv.lf}").add(",", "${csv.comma}").build();
  
  		public Builder nullToken(String nullToken) {
  			this.nullToken = nullToken;
  			return this;
  		}
  
  		public Builder emptyToken(String emptyToken) {
  			this.emptyToken = emptyToken;
  			return this;
  		}
  
  		public Builder replacer(Replacer replacer) {
  			this.replacer = replacer;
  			return this;
  		}
  
  		@Override
  		public CsvStringFormatter build() {
  			return new CsvStringFormatter(this);
  		}
  
  		public String getNullToken() {
  			return nullToken;
  		}
  
  		public void setNullToken(String nullToken) {
  			this.nullToken = nullToken;
  		}
  
 		public String getEmptyToken() {
 			return emptyToken;
 		}
 
 		public void setEmptyToken(String emptyToken) {
 			this.emptyToken = emptyToken;
 		}
 
 		public Replacer getReplacer() {
 			return replacer;
 		}
 
 		public void setReplacer(Replacer replacer) {
 			this.replacer = replacer;
 		}
 	}
 
 	public String getNullToken() {
 		return nullToken;
 	}
 
 	public String getEmptyToken() {
 		return emptyToken;
 	}
 
 	public Replacer getReplacer() {
 		return replacer;
 	}
 
 }