content: package net.sf.expectit.ant.matcher;
  
  /*
   * #%L
   * ExpectIt
   * %%
   * Copyright (C) 2014 Alexey Gavrilov and contributors
   * %%
   * 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.
   * #L%
   */
  
  import net.sf.expectit.Result;
  
  /**
   * An abstract base matcher element for matchers that require regular expression.
   */
  abstract class AbstractRegexpElement extends AbstractMatcherElement<Result> {
      private String regexp;
  
      /**
       * Sets the regular expression.
       *
       * @param regexp the regular expression.
       */
      public void setRegexp(String regexp) {
          this.regexp = regexp;
      }
  
      /**
       * Gets the regular expression.
       *
       * @return the regular expression.
       */
      String getRegexp() {
          if (regexp == null) {
              throw new IllegalArgumentException("regexp value is required");
          }
          return getProject().replaceProperties(regexp);
      }
  }
  