LengthChecker.java

package org.aitools.programd.test.aiml;

import org.aitools.util.runtime.DeveloperError;

/**
 * Tests whether a given input has an expected length.
 * 
 * @author Albertas Mickensas
 * @author <a href="noel@aitools.org">Noel Bush</a>
 */
public class LengthChecker extends Checker {

  private int expectedLength = -1;

  /**
   * Creates a new LengthChecker with the given length.
   * 
   * @param length the length to check for
   */
  public LengthChecker(String length) {
    try {
      this.expectedLength = Integer.parseInt(length);
    }
    catch (NumberFormatException e) {
      throw new DeveloperError("The schema allowed a non-integer value for LengthChecker!", e);
    }
  }

  /**
   * @see org.aitools.programd.test.aiml.Checker#getContent()
   */
  @Override
  public String getContent() {
    return "" + this.expectedLength;
  }

  /**
   * @see org.aitools.programd.test.aiml.Checker#getExpected()
   */
  @Override
  public String getExpected() {
    return String.format("Expected length: %d", Integer.toString(this.expectedLength));
  }

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

  /**
   * Tests whether the given input has the expected length.
   * 
   * @param input the input to test
   * @return whether the given input has the expected length
   * @see org.aitools.programd.test.aiml.Checker#test(java.lang.String)
   */
  @Override
  public boolean test(String input) {
    if (this.expectedLength != -1) {
      if (input.trim().length() == this.expectedLength) {
        return true;
      }
      // otherwise...
      return false;
    }
    // otherwise...
    return false;
  }
}