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 java.io.IOException;
  import net.sf.expectit.Result;
  import net.sf.expectit.matcher.Matcher;
  import org.apache.tools.ant.BuildException;
  
  /**
   * An abstract generic matcher element.
   *
   * @param <R> the type result
   */
  abstract class AbstractMatcherElement<R extends Result> extends AbstractTaskElement {
      private Long timeout;
      private Integer input;
      private String resultPrefix;
  
      /**
       * Default constructor.
       */
      protected AbstractMatcherElement() {
      }
  
      /**
       * Creates a matcher by calling {@link #createMatcher()} method and executes the expect
       * operation.
       */
      public final void execute() {
          try {
              Matcher<R> matcher = createMatcher();
              R result;
              if (input == null && timeout == null) {
                  result = getExpect().expect(matcher);
              } else if (timeout == null) {
                  result = getExpect().expectIn(input, matcher);
              } else if (input == null) {
                  result = getExpect().expect(timeout, matcher);
              } else {
                  result = getExpect().expectIn(input, timeout, matcher);
              }
              exportSuccessfulResult(resultPrefix, result);
          } catch (IOException e) {
              throw new BuildException(e);
          }
      }
  
      /**
       * Exports the successful result of the match as a set of properties with the given prefix.
       * The properties key/value
       * format is as follows:
       * <ul>
       * <li>{@code prefix + ".before" = result.getBefore()}</li>
       * <li>{@code prefix + ".group" = result.group()}</li>
       * <li>{@code prefix + ".success" = true}</li>
       * <li>{@code prefix + ".group." + &lt;number&gt; = result.group(&lt;number&gt;)},
       * where the {@code number}
       * is between 1 and {@code result.groupCount()}</li>
       * </ul>
       * If the {@code prefix} is {@code null}, or the {@code result} is not successful,
       * then this method does nothing.
       *
       * @param prefix the property prefix
       * @param result the result
       */
      protected void exportSuccessfulResult(String prefix, R result) {
          if (prefix == null) {
              return;
          }
          setPropertyIfNoNull(prefix, "input", result.getInput());
          if (!result.isSuccessful()) {
              return;
          }
          setPropertyIfNoNull(prefix, "input", result.getInput());
          setPropertyIfNoNull(prefix, "before", result.getBefore());
          setPropertyIfNoNull(prefix, "group", result.group());
          setPropertyIfNoNull(prefix, "success", "true");
          for (int i = 1; i <= result.groupCount(); i++) {
              setPropertyIfNoNull(prefix, "group." + i, result.group(i));
          }
      }
  
      private void setPropertyIfNoNull(String prefix, String name, String value) {
          if (value != null) {
              getProject().setProperty(prefix + "." + name, value);
          }
      }
  
      /**
       * Create a matcher corresponding to this element.
       *
       * @return the matcher instance
       */
      protected abstract Matcher<R> createMatcher();
  
      /**
       * Sets the timeout for the expect operation.
       *
       * @param timeout the timeout in milliseconds.
       */
      public void setTimeout(long timeout) {
          this.timeout = timeout;
      }
  
      /**
       * Sets the input number. {@code 0} is default.
       *
       * @param input the input number
       */
      public void setInput(int input) {
          this.input = input;
      }
  
      /**
       * Sets the property result prefix used to export a match result.
       *
       * @param resultPrefix the property prefix
       */
      public void setResultPrefix(String resultPrefix) {
          this.resultPrefix = resultPrefix;
      }
  
      /**
       * Gets the property prefix.
       *
       * @return the property prefix
       */
      public String getResultPrefix() {
          return resultPrefix;
      }
  }
  