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/*
 * Copyright 2012, Ryan J. McDonough
 *
 * 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 com.damnhandy.uri.template.impl;

import static com.damnhandy.uri.template.UriTemplate.DEFAULT_SEPARATOR;

import com.damnhandy.uri.template.UriTemplate.Encoding;

/**
 * 
 * An enum representing an operator in a URI Template.
 * 
 *  *  .------------------------------------------------------------------.
 *  |          NUL     +      .       /       ;      ?      &      #   |
 *  |------------------------------------------------------------------|
 *  | first |  ""     ""     "."     "/"     ";"    "?"    "&"    "#"  |
 *  | sep   |  ","    ","    "."     "/"     ";"    "&"    "&"    ","  |
 *  | named | false  false  false   false   true   true   true   false |
 *  | ifemp |  ""     ""     ""      ""      ""     "="    "="    ""   |
 *  | allow |   U     U+R     U       U       U      U      U     U+R  |
 *  `------------------------------------------------------------------'
 *  
 *
 * @author Ryan J. McDonough
 * @version $Revision: 1.1 $
 */

public enum Operator {




   NUL         ("",  DEFAULT_SEPARATOR,  false,  Encoding.U),
   RESERVED    ("+", DEFAULT_SEPARATOR,  false,  Encoding.UR),
   NAME_LABEL  (".", ".",                false,  Encoding.U),
   PATH        ("/", "/",                false,  Encoding.U),
   MATRIX      (";", ";",                true,   Encoding.U),
   QUERY       ("?", "&",                true,   Encoding.U),
   CONTINUATION("&", "&",                true,   Encoding.U),
   FRAGMENT    ("#", DEFAULT_SEPARATOR,  false,  Encoding.UR);


   /**
    *
    */
   private String operator;

   /**
    *
    */
   private String separator;

   /**
    *
    */
   private boolean named;

   /**
    *
    */
   private Encoding encoding = Encoding.U;

   /**
    *
    * Create a new Operator.
    *
    * @param operator the operator
    * @param separator the separatator
    */
   Operator(String operator, String separator, boolean named, Encoding encoding)
   {
      this.operator = operator;
      this.separator = separator;
      this.named = named;
      this.encoding = encoding;
   }

   public String getOperator()
   {
      return this.operator;
   }

   public String getSeparator()
   {
      return this.separator;
   }

   /**
    *
    *
    * @return the encoding to be used
    */
   public Encoding getEncoding() {
      return encoding;
   }
   /**
    *
    *
    * @return tbd
    */
   public boolean isNamed()
   {
      return named;
   }


   /**
    */
   public String getListSeparator()
   {
      return DEFAULT_SEPARATOR;
   }

   /**
    * When the variable is a Collection, this flag determines if we use
    * the VarSpec name to prefix values. For example:
    *
    * {&apm;list} return false
    *
    * {&apm;list*} will return true
    *
    * @return tbd
    */
   public boolean useVarNameWhenExploded()
   {
      return named;
   }

   /**
    *
    *
    * @return the prefix
    */
   public String getPrefix()
   {
      return operator;
   }

   /**
    * FIXME Comment this
    *
    * @param opCode the opertator code
    * @return the Operator
    */
   public static Operator fromOpCode(String opCode) throws IllegalArgumentException
   {
      for (Operator op : Operator.values())
      {
         if (op.getOperator().equalsIgnoreCase(opCode))
         {
            return op;
         }
         else if ("!".equals(opCode) || "=".equals(opCode))
         {
            throw new IllegalArgumentException(opCode + " is not a valid operator.");
         }
      }
      return null;
   }
}