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///////////////////////////////////////////////////////////////////////////////
//Copyright (C) 2014 Joliciel Informatique
//
//This file is part of Talismane.
//
//Talismane is free software: you can redistribute it and/or modify
//it under the terms of the GNU Affero General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//Talismane is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU Affero General Public License for more details.
//
//You should have received a copy of the GNU Affero General Public License
//along with Talismane.  If not, see .
//////////////////////////////////////////////////////////////////////////////
package com.joliciel.talismane.machineLearning.features;

import java.util.HashMap;
import java.util.Map;

/**
 * An environment giving a feature access to any variables that were set during
 * top-level feature initialisation.
 * 
 * @author Assaf
 *
 */
public class RuntimeEnvironment {
  private Map variableMap = new HashMap();
  private String key = null;

  public Object getValue(String variableName) {
    return variableMap.get(variableName);
  }

  public void setValue(String variableName, Object value) {
    variableMap.put(variableName, value);
    key = null;
  }

  /**
   * A key uniquely describing this environment.
   */
  public String getKey() {
    if (key == null) {
      if (variableMap.size() == 0)
        key = "";
      else {
        StringBuilder sb = new StringBuilder();
        for (String variable : variableMap.keySet()) {
          sb.append("|" + variable + ":" + variableMap.get(variable).toString());
        }
        key = sb.toString();
      }
    }
    return key;
  }

}