FloatValidator.java
/*
* 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
*
* 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.apache.commons.validator.routines;
import java.text.Format;
import java.util.Locale;
/**
* <p><b>Float Validation</b> and Conversion routines (<code>java.lang.Float</code>).</p>
*
* <p>This validator provides a number of methods for
* validating/converting a <code>String</code> value to
* a <code>Float</code> using <code>java.text.NumberFormat</code>
* to parse either:</p>
* <ul>
* <li>using the default format for the default <code>Locale</code></li>
* <li>using a specified pattern with the default <code>Locale</code></li>
* <li>using the default format for a specified <code>Locale</code></li>
* <li>using a specified pattern with a specified <code>Locale</code></li>
* </ul>
*
* <p>Use one of the <code>isValid()</code> methods to just validate or
* one of the <code>validate()</code> methods to validate and receive a
* <i>converted</i> <code>Float</code> value.</p>
*
* <p>Once a value has been successfully converted the following
* methods can be used to perform minimum, maximum and range checks:</p>
* <ul>
* <li><code>minValue()</code> checks whether the value is greater
* than or equal to a specified minimum.</li>
* <li><code>maxValue()</code> checks whether the value is less
* than or equal to a specified maximum.</li>
* <li><code>isInRange()</code> checks whether the value is within
* a specified range of values.</li>
* </ul>
*
* <p>So that the same mechanism used for parsing an <i>input</i> value
* for validation can be used to format <i>output</i>, corresponding
* <code>format()</code> methods are also provided. That is you can
* format either:</p>
* <ul>
* <li>using the default format for the default <code>Locale</code></li>
* <li>using a specified pattern with the default <code>Locale</code></li>
* <li>using the default format for a specified <code>Locale</code></li>
* <li>using a specified pattern with a specified <code>Locale</code></li>
* </ul>
*
* @since 1.3.0
*/
public class FloatValidator extends AbstractNumberValidator {
private static final long serialVersionUID = -4513245432806414267L;
private static final FloatValidator VALIDATOR = new FloatValidator();
/**
* Gets the singleton instance of this validator.
* @return A singleton instance of the FloatValidator.
*/
public static FloatValidator getInstance() {
return VALIDATOR;
}
/**
* Constructs a <i>strict</i> instance.
*/
public FloatValidator() {
this(true, STANDARD_FORMAT);
}
/**
* <p>Construct an instance with the specified strict setting
* and format type.</p>
*
* <p>The <code>formatType</code> specified what type of
* <code>NumberFormat</code> is created - valid types
* are:</p>
* <ul>
* <li>AbstractNumberValidator.STANDARD_FORMAT -to create
* <i>standard</i> number formats (the default).</li>
* <li>AbstractNumberValidator.CURRENCY_FORMAT -to create
* <i>currency</i> number formats.</li>
* <li>AbstractNumberValidator.PERCENT_FORMAT -to create
* <i>percent</i> number formats (the default).</li>
* </ul>
*
* @param strict {@code true} if strict
* <code>Format</code> parsing should be used.
* @param formatType The <code>NumberFormat</code> type to
* create for validation, default is STANDARD_FORMAT.
*/
public FloatValidator(final boolean strict, final int formatType) {
super(strict, formatType, true);
}
/**
* Check if the value is within a specified range.
*
* @param value The <code>Number</code> value to check.
* @param min The minimum value of the range.
* @param max The maximum value of the range.
* @return {@code true} if the value is within the
* specified range.
*/
public boolean isInRange(final float value, final float min, final float max) {
return value >= min && value <= max;
}
/**
* Check if the value is within a specified range.
*
* @param value The <code>Number</code> value to check.
* @param min The minimum value of the range.
* @param max The maximum value of the range.
* @return {@code true} if the value is within the
* specified range.
*/
public boolean isInRange(final Float value, final float min, final float max) {
return isInRange(value.floatValue(), min, max);
}
/**
* Check if the value is less than or equal to a maximum.
*
* @param value The value validation is being performed on.
* @param max The maximum value.
* @return {@code true} if the value is less than
* or equal to the maximum.
*/
public boolean maxValue(final float value, final float max) {
return value <= max;
}
/**
* Check if the value is less than or equal to a maximum.
*
* @param value The value validation is being performed on.
* @param max The maximum value.
* @return {@code true} if the value is less than
* or equal to the maximum.
*/
public boolean maxValue(final Float value, final float max) {
return maxValue(value.floatValue(), max);
}
/**
* Check if the value is greater than or equal to a minimum.
*
* @param value The value validation is being performed on.
* @param min The minimum value.
* @return {@code true} if the value is greater than
* or equal to the minimum.
*/
public boolean minValue(final float value, final float min) {
return value >= min;
}
/**
* Check if the value is greater than or equal to a minimum.
*
* @param value The value validation is being performed on.
* @param min The minimum value.
* @return {@code true} if the value is greater than
* or equal to the minimum.
*/
public boolean minValue(final Float value, final float min) {
return minValue(value.floatValue(), min);
}
/**
* <p>Perform further validation and convert the <code>Number</code> to
* a <code>Float</code>.</p>
*
* @param value The parsed <code>Number</code> object created.
* @param formatter The Format used to parse the value with.
* @return The parsed <code>Number</code> converted to a
* <code>Float</code> if valid or {@code null} if invalid.
*/
@Override
protected Object processParsedValue(final Object value, final Format formatter) {
final double doubleValue = ((Number) value).doubleValue();
if (doubleValue > 0) {
if (doubleValue < Float.MIN_VALUE) {
return null;
}
if (doubleValue > Float.MAX_VALUE) {
return null;
}
} else if (doubleValue < 0) {
final double posDouble = doubleValue * -1;
if (posDouble < Float.MIN_VALUE) {
return null;
}
if (posDouble > Float.MAX_VALUE) {
return null;
}
}
return Float.valueOf((float) doubleValue);
}
/**
* <p>Validate/convert a <code>Float</code> using the default
* <code>Locale</code>.
*
* @param value The value validation is being performed on.
* @return The parsed <code>Float</code> if valid or {@code null}
* if invalid.
*/
public Float validate(final String value) {
return (Float) parse(value, (String) null, (Locale) null);
}
/**
* <p>Validate/convert a <code>Float</code> using the
* specified <code>Locale</code>.
*
* @param value The value validation is being performed on.
* @param locale The locale to use for the number format, system default if null.
* @return The parsed <code>Float</code> if valid or {@code null} if invalid.
*/
public Float validate(final String value, final Locale locale) {
return (Float) parse(value, (String) null, locale);
}
/**
* <p>Validate/convert a <code>Float</code> using the
* specified <i>pattern</i>.
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to validate the value against.
* @return The parsed <code>Float</code> if valid or {@code null} if invalid.
*/
public Float validate(final String value, final String pattern) {
return (Float) parse(value, pattern, (Locale) null);
}
/**
* <p>Validate/convert a <code>Float</code> using the
* specified pattern and/ or <code>Locale</code>.
*
* @param value The value validation is being performed on.
* @param pattern The pattern used to validate the value against, or the
* default for the <code>Locale</code> if {@code null}.
* @param locale The locale to use for the date format, system default if null.
* @return The parsed <code>Float</code> if valid or {@code null} if invalid.
*/
public Float validate(final String value, final String pattern, final Locale locale) {
return (Float) parse(value, pattern, locale);
}
}