/**
 * Copyright 2010 Google Inc.
 *
 * 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.
 *
 */

package org.waveprotocol.wave.model.schema;

/**
 * Various utilities that can be used by document schemas.
 *
 */
public class SchemaUtils {

  public static final String[] BOOLEAN_VALUES = {"true", "false"};

  public static boolean isValidInteger(String value, int min) {
    try {
      int x = Integer.parseInt(value);
      return x >= min;
    } catch (NumberFormatException e) {
      return false;
    }
  }

  public static boolean isNonNegativeInteger(String value) {
    return isValidInteger(value, 0);
  }

  public static boolean isPositiveInteger(String value) {
    return isValidInteger(value, 1);
  }

  public static boolean isWaveletId(String value) {
    // NOTE(user): This could/should be strengthened to test that value
    // looks like a wavelet id. But for now, the wavelet-id domain type is
    // approximated as just a string.
    return true;
  }

  public static boolean isLong(String value) {
    try {
      Long.parseLong(value);
      return true;
    } catch (NumberFormatException e) {
      return false;
    }
  }

  public static boolean isDouble(String value) {
    try {
      Double.parseDouble(value);
      return true;
    } catch (NumberFormatException e) {
      return false;
    }
  }

  private SchemaUtils() { }

}