/**
    * 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.base.string;
  
  import static org.kuali.common.util.base.Precondition.checkNotNull;
  
  import java.util.Map;
  
  import com.google.common.collect.BiMap;
  import com.google.common.collect.HashBiMap;
  import com.google.common.collect.ImmutableBiMap;
  
  public final class Replacer {
  
  	private final ImmutableBiMap<String, String> tokens;
  
  	public String replace(final String string) {
  		String s = string;
  		for (Map.Entry<String, String> pair : tokens.entrySet()) {
  			s = s.replace(pair.getKey(), pair.getValue());
  		}
  		return s;
  	}
  
  	public String restore(final String string) {
  		String s = string;
  		for (Map.Entry<String, String> pair : tokens.entrySet()) {
  			s = s.replace(pair.getValue(), pair.getKey());
  		}
  		return s;
  	}
  
  	private Replacer(Builder builder) {
  		this.tokens = ImmutableBiMap.copyOf(builder.tokens);
  	}
  
  	public static Replacer create(String oldToken, String newToken) {
  		return builder().add(oldToken, newToken).build();
  	}
  
  	public static Builder builder() {
  		return new Builder();
  	}
  
  	public static class Builder implements org.apache.commons.lang3.builder.Builder<Replacer> {
  
  		private BiMap<String, String> tokens = HashBiMap.create();
  
  		public Builder add(String oldToken, String newToken) {
  			this.tokens.put(oldToken, newToken);
  			return this;
  		}
  
  		public Builder tokens(BiMap<String, String> tokens) {
  			this.tokens = tokens;
  			return this;
  		}
  
  		@Override
  		public Replacer build() {
  			Replacer instance = new Replacer(this);
  			validate(instance);
  			return instance;
  		}
  
  		private static void validate(Replacer instance) {
  			checkNotNull(instance.tokens, "tokens");
  		}
  
  		public BiMap<String, String> getTokens() {
  			return tokens;
  		}
  
  		public void setTokens(BiMap<String, String> tokens) {
  			this.tokens = tokens;
  		}
  	}
  
  	public BiMap<String, String> getTokens() {
  		return tokens;
  	}
  
  }