MatchChecker.java

package org.aitools.programd.test.aiml;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Tests whether a given input matches a regular expression.
 * 
 * @author <a href="noel@aitools.org">Noel Bush</a>
 */
public class MatchChecker extends Checker {

  private Matcher matcher = null;

  /**
   * Creates a new MatchChecker with the given regular expression.
   * 
   * @param pattern the regular expression
   */
  public MatchChecker(String pattern) {
    this.matcher = Pattern.compile(pattern, Pattern.CANON_EQ).matcher("");
  }

  /**
   * @see org.aitools.programd.test.aiml.Checker#getContent()
   */
  @Override
  public String getContent() {
    return this.matcher.pattern().toString();
  }

  /**
   * @see org.aitools.programd.test.aiml.Checker#getExpected()
   */
  @Override
  public String getExpected() {
    return String.format("Match of pattern \"%s\"", this.matcher.pattern().pattern());
  }

  /**
   * @see org.aitools.programd.test.aiml.Checker#getTagName()
   */
  @Override
  public String getTagName() {
    return Checker.TAG_EXPECTED_MATCH;
  }

  /**
   * Tests whether the given input matches the expected answer.
   * 
   * @param input the input to test
   * @return whether the given input matches the expected answer
   * @see org.aitools.programd.test.aiml.Checker#test(java.lang.String)
   */
  @Override
  public boolean test(String input) {
    if (null != this.matcher) {
      this.matcher.reset(input);
      return this.matcher.matches();
    }
    // otherwise...
    return false;
  }
}