content: /*
   * Copyright 2014 Agorava
   *
   * 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 org.agorava.cdi.config;
  
  import org.apache.deltaspike.core.api.config.ConfigResolver;
  import org.apache.deltaspike.core.api.interpreter.ExpressionInterpreter;
  
  /**
   * @author Antoine Sabot-Durand
   */
  public class DifferentOrNull implements ExpressionInterpreter<String, Boolean> {
  
  
      protected String getConfiguredValue(String key) {
          return ConfigResolver.getProjectStageAwarePropertyValue(key);
      }
  
      @Override
      public Boolean evaluate(String expression) {
          String[] elts = expression.split(",");
          if (elts.length != 2)
              throw new IllegalArgumentException("Expression " + expression + " has a wrong format. Should be 'key,value'");
          String value = getConfiguredValue(elts[0]);
          if (value == null)
              return true;
          else
              return !value.equals(elts[1].trim());
      }
  }
  