PositiveLength.java

/**
 * **********************************************************************
 *
 * <p>Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to you 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
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.
 *
 * <p>**********************************************************************
 */
package org.odftoolkit.odfdom.type;

import java.util.regex.Pattern;

/**
 * This class represents the in OpenDocument format used data type {@odf.datatype positiveLength}
 */
public class PositiveLength extends Length {
  private static final Pattern positiveLengthPattern =
      Pattern.compile(
          "^([0-9]*[1-9][0-9]*(\\.[0-9]*)?|0+\\.[0-9]*[1-9][0-9]*|\\.[0-9]*[1-9][0-9]*)((cm)|(mm)|(in)|(pt)|(pc)|(px))$");

  /**
   * Construct PositiveLength by the parsing the given string
   *
   * @param length The String to be parsed into PositiveLength
   * @throws NumberFormatException if the given argument is not a valid PostitiveLength
   */
  public PositiveLength(String length) throws NumberFormatException {
    super(length);
    if (!isValid(length)) {
      throw new NumberFormatException("parameter is invalid for datatype PositiveLength");
    }
  }

  /**
   * Returns a PositiveLength instance representing the specified String value
   *
   * @param stringValue a String value
   * @return return a PositiveLength instance representing stringValue
   * @throws NumberFormatException if the given argument is not a valid PostitiveLength
   */
  public static PositiveLength valueOf(String stringValue) throws NumberFormatException {
    return new PositiveLength(stringValue);
  }

  /**
   * check if the specified String instance is a valid {@odf.datatype positiveLength} data type
   *
   * @param stringValue the value to be tested
   * @return true if the value of argument is valid for {@odf.datatype positiveLength} data type
   *     false otherwise
   */
  public static boolean isValid(String stringValue) {
    if ((stringValue == null) || (!positiveLengthPattern.matcher(stringValue).matches())) {
      return false;
    } else {
      return true;
    }
  }
}