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 * $Id$
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package org.exolab.castor.xml.validators;

import java.text.MessageFormat;

import org.castor.xml.XMLProperties;
import org.exolab.castor.xml.TypeValidator;
import org.exolab.castor.xml.ValidationContext;
import org.exolab.castor.xml.ValidationException;

/**
 * The Integer Validation class. This class handles validation for the primitive <code>long</code>
 * and <code>java.lang.Long</code> types as well as all xsd:integer-derived types such as
 * positive-integer and negative-integer
 *
 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
 */
public class IntegerValidator extends PatternValidator implements TypeValidator {

  /** If true, we perform "minimum value" validation. */
  private boolean _useMin = false;
  /** If true, we perform "maximum value" validation. */
  private boolean _useMax = false;
  /** If true, we perform "fixed" validation. */
  private boolean _useFixed = false;
  /** Minimum value (inclusive) for this long. (Not used unless _useMin == true.) */
  private long _min = 0;
  /** Maximum value (inclusive) for this long. (Not used unless _useMax == true.) */
  private long _max = 0;
  /** Maximum number of digits in this long. (Not applied if < 0.) */
  private int _totalDigits = -1;
  /** Fixed value of this long. (Not used unless _useFixed == true.) */
  private long _fixed = 0;

  /**
   * Creates a new IntegerValidator with no restrictions.
   */
  public IntegerValidator() {
    super();
  }

  /**
   * Clears the fixed value for this IntegerValidator.
   */
  public void clearFixed() {
    _useFixed = false;
  }

  /**
   * Clears the maximum value for this IntegerValidator.
   */
  public void clearMax() {
    _useMax = false;
  }

  /**
   * Clears the minimum value for this IntegerValidator.
   */
  public void clearMin() {
    _useMin = false;
  }

  /**
   * Returns the configured fixed value for Integer validation. Returns null if no fixed value has
   * been configured.
   *
   * @return the fixed value to validate against.
   */
  public Long getFixed() {
    if (_useFixed) {
      return Long.valueOf(_fixed);
    }
    return null;
  }

  /**
   * Returns the configured maximum value for xsd:integer validation. Returns null if no maximum has
   * been configured.
   *
   * @return the maximum (inclusive) value to validate against.
   */
  public Long getMaxInclusive() {
    if (_useMax) {
      return Long.valueOf(_max);
    }
    return null;
  }

  /**
   * Returns the configured minimum value for xsd:integer validation. Returns null if no minimum has
   * been configured.
   *
   * @return the minimum (inclusive) value to validate against.
   */
  public Long getMinInclusive() {
    if (_useMin) {
      return Long.valueOf(_min);
    }
    return null;
  }

  /**
   * Returns the configured maximum number of digits (inclusive) for xsd:integer validation. Returns
   * null if no maximum number of digits has been configured.
   *
   * @return the maximum number of digits to validate against.
   */
  public Integer getTotalDigits() {
    if (_totalDigits >= 0) {
      return Integer.valueOf(_totalDigits);
    }
    return null;
  }

  /**
   * Returns true if a fixed value to validate against has been set.
   *
   * @return true if a fixed value has been set.
   */
  public boolean hasFixed() {
    return _useFixed;
  }

  /**
   * Sets the fixed value that integers validated with this validated must be equal to.
   * <p>
   * NOTE: Using Fixed values takes preceedence over using max and mins, and is really the same as
   * setting both max-inclusive and min-inclusive to the same value
   *
   * @param fixedValue the fixed value an integer validated with this validator must be equal to.
   */
  public void setFixed(final long fixedValue) {
    _useFixed = true;
    this._fixed = fixedValue;
  }

  /**
   * Sets the fixed value that integers validated with this validated must be equal to.
   * <p>
   * NOTE: Using Fixed values takes preceedence over using max and mins, and is really the same as
   * setting both max-inclusive and min-inclusive to the same value
   * 
   * Added for backward compatibility with old &lt;xs:integer&gt; implementation.
   *
   * @param fixedValue the fixed value an integer validated with this validator must be equal to.
   */
  public void setFixed(final int fixedValue) {
    _useFixed = true;
    this._fixed = fixedValue;
  }

  /**
   * Sets the fixed value for xsd:Integer validation.
   * <p>
   * NOTE: If maximum and/or minimum values have been set and the fixed value is not within that
   * max/min range, then no xsd:Integer will pass validation. This is as according to the XML Schema
   * spec.
   *
   * @param fixedValue the fixed value that a xsd:Integer validated with this validator must be
   *        equal to.
   */
  public void setFixed(final Long fixedValue) {
    _useFixed = true;
    this._fixed = fixedValue.intValue();
  }

  /**
   * Sets the minimum (exclusive) value for xsd:integer validation. To pass validation, an
   * xsd:Integer must be greater than this value.
   *
   * @param minValue the minimum (exclusive) value for xsd:Integer validation.
   */
  public void setMinExclusive(final long minValue) {
    _useMin = true;
    _min = minValue + 1;
  }

  /**
   * Sets the minimum (exclusive) value for xsd:integer validation. To pass validation, an
   * xsd:Integer must be greater than this value.
   * 
   * Added for backward compatibility with old &lt;xs:integer&gt; implementation.
   *
   * @param minValue the minimum (exclusive) value for xsd:Integer validation.
   */
  public void setMinExclusive(final int minValue) {
    _useMin = true;
    _min = minValue + 1;
  }

  /**
   * Sets the minimum (inclusive) value for xsd:integer validation. To pass validation, an
   * xsd:integer must be greater than or equal to this value.
   *
   * @param minValue the minimum (inclusive) value for xsd:integer validation.
   */
  public void setMinInclusive(final long minValue) {
    _useMin = true;
    _min = minValue;
  }

  /**
   * Sets the minimum (inclusive) value for xsd:integer validation. To pass validation, an
   * xsd:integer must be greater than or equal to this value.
   *
   * Added for backward compatibility with old &lt;xs:integer&gt; implementation.
   *
   * @param minValue the minimum (inclusive) value for xsd:integer validation.
   */
  public void setMinInclusive(final int minValue) {
    _useMin = true;
    _min = minValue;
  }

  /**
   * Sets the maximum (exclusive) value for xsd:integer validation. To pass validation, a
   * xsd:integer must be less than this value.
   *
   * @param maxValue the maximum (exclusive) value for xsd:integer validation.
   */
  public void setMaxExclusive(final long maxValue) {
    _useMax = true;
    _max = maxValue - 1;
  }

  /**
   * Sets the maximum (exclusive) value for xsd:integer validation. To pass validation, a
   * xsd:integer must be less than this value.
   *
   * Added for backward compatibility with old &lt;xs:integer&gt; implementation.
   *
   * @param maxValue the maximum (exclusive) value for xsd:integer validation.
   */
  public void setMaxExclusive(final int maxValue) {
    _useMax = true;
    _max = maxValue - 1;
  }


  /**
   * Sets the maximum (inclusive) value for xsd:integer validation. To pass validation, a
   * xsd:integer must be less than or equal to this value.
   *
   * @param maxValue the maximum (inclusive) value for xsd:integer validation.
   */
  public void setMaxInclusive(final long maxValue) {
    _useMax = true;
    _max = maxValue;
  }

  /**
   * Sets the maximum (inclusive) value for xsd:integer validation. To pass validation, a
   * xsd:integer must be less than or equal to this value.
   *
   * Added for backward compatibility with old &lt;xs:integer&gt; implementation.
   *
   * @param maxValue the maximum (inclusive) value for xsd:integer validation.
   */
  public void setMaxInclusive(final int maxValue) {
    _useMax = true;
    _max = maxValue;
  }

  /**
   * Sets the maximum number of digits for xsd:integer validation. To pass validation, a xsd:integer
   * must have this many digits or fewer. Leading zeros are not counted.
   *
   * @param totalDig the maximum (inclusive) number of digits for xsd:integer validation. (must be >
   *        0)
   */
  public void setTotalDigits(final int totalDig) {
    if (totalDig <= 0) {
      throw new IllegalArgumentException(
          "IntegerValidator: the totalDigits facet must be positive");
    }
    _totalDigits = totalDig;
  }

  /**
   * Validates the given Object.
   *
   * @param value the long to validate
   * @param context the ValidationContext
   * @throws ValidationException if the object fails validation.
   */
  public void validate(final long value, final ValidationContext context)
      throws ValidationException {
    if (_useFixed && value != _fixed) {
      String err =
          MessageFormat.format(resourceBundle.getString("integerValidator.error.not.fixed.value"),
              new Object[] {"long", value, _fixed});
      throw new ValidationException(err);
    }

    if (_useMin && value < _min) {
      String err =
          MessageFormat.format(resourceBundle.getString("integerValidator.error.less.than.minimum"),
              new Object[] {"long", value, _min});
      throw new ValidationException(err);
    }

    if (_useMax && value > _max) {
      String err = MessageFormat.format(
          resourceBundle.getString("integerValidator.error.greater.than.maximum"),
          new Object[] {"long", value, _min});
      throw new ValidationException(err);
    }

    if (_totalDigits != -1) {
      int length = Long.toString(value).length();
      if (value < 0) {
        length--;
      }
      if (length > _totalDigits) {
        String err =
            MessageFormat.format(resourceBundle.getString("integerValidator.error.too.many.digits"),
                new Object[] {"long", value, _totalDigits});
        throw new ValidationException(err);
      }
    }

    if (hasPattern()) {
      super.validate(Long.toString(value), context);
    }
  }

  /**
   * Validates the given Object.
   *
   * @param object the Object to validate
   * @throws ValidationException if the object fails validation.
   */
  public void validate(final Object object) throws ValidationException {
    validate(object, (ValidationContext) null);
  }

  /**
   * Validates the given Object.
   *
   * @param object the Object to validate
   * @param context the ValidationContext
   * @throws ValidationException if the object fails validation.
   */
  public void validate(final Object object, final ValidationContext context)
      throws ValidationException {
    if (object == null) {
      throw new ValidationException(resourceBundle.getString("integerValidator.error.null.object"));
    }

    long value = 0;
    try {
      value = ((Long) object).longValue();
    } catch (Exception ex) {
      String lenientProperty =
          context.getInternalContext().getStringProperty(XMLProperties.LENIENT_INTEGER_VALIDATION);
      if (Boolean.valueOf(lenientProperty).booleanValue()) {
        try {
          value = ((Integer) object).longValue();
        } catch (Exception e) {
          String err = MessageFormat.format(
              resourceBundle.getString("integerValidator.error.wrong.class.lenient"),
              new Object[] {object.getClass().getName()});
          throw new ValidationException(err);
        }
      } else {
        String err =
            MessageFormat.format(resourceBundle.getString("integerValidator.error.wrong.class"),
                new Object[] {object.getClass().getName()});
        throw new ValidationException(err);
      }
    }
    validate(value, context);
  }

}
