Coverage report

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org.apache.commons.validator.routines.PercentValidator
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 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  *
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  *
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.validator.routines;
 18  
 
 19  
 import java.text.DecimalFormat;
 20  
 import java.text.Format;
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 import java.math.BigDecimal;
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 23  
 /**
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  * <p><b>Percentage Validation</b> and Conversion routines (<code>java.math.BigDecimal</code>).</p>
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  * 
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  * <p>This is one implementation of a percent validator that has the following features:</p>
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  *    <ul>
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  *       <li>It is <i>lenient</i> about the the presence of the <i>percent symbol</i></li>
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  *       <li>It converts the percent to a <code>java.math.BigDecimal</code></li>
 30  
  *    </ul>
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  * 
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  * <p>However any of the <i>number</i> validators can be used for <i>percent</i> validation.
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  *    For example, if you wanted a <i>percent</i> validator that converts to a
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  *    <code>java.lang.Float</code> then you can simply instantiate an
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  *    <code>FloatValidator</code> with the appropriate <i>format type</i>:</p>
 36  
  *    
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  *    <p><code>... = new FloatValidator(false, FloatValidator.PERCENT_FORMAT);</code></p>
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  *
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  * <p>Pick the appropriate validator, depending on the type (i.e Float, Double or BigDecimal)
 40  
  *    you want the percent converted to. Please note, it makes no sense to use
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  *    one of the validators that doesn't handle fractions (i.e. byte, short, integer, long
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  *    and BigInteger) since percentages are converted to fractions (i.e <code>50%</code> is
 43  
  *    converted to <code>0.5</code>).</p>
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  *
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  * @version $Revision: 478334 $ $Date: 2006-11-22 21:31:54 +0000 (Wed, 22 Nov 2006) $
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  * @since Validator 1.3.0
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  */
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 public class PercentValidator extends BigDecimalValidator {
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 50  2
     private static final PercentValidator VALIDATOR = new PercentValidator();
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 52  
     /** DecimalFormat's percent (thousand multiplier) symbol */
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     private static final char PERCENT_SYMBOL = '%';
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 55  1
     private static final BigDecimal POINT_ZERO_ONE = new BigDecimal("0.01");
 56  
 
 57  
     /**
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      * Return a singleton instance of this validator.
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      * @return A singleton instance of the PercentValidator.
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      */
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     public static BigDecimalValidator getInstance() {
 62  4
         return VALIDATOR;
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     }
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 65  
     /**
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      * Construct a <i>strict</i> instance.
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      */
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     public PercentValidator() {
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         this(true);
 70  4
     }
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 72  
     /**
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      * Construct an instance with the specified strict setting.
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      * 
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      * @param strict <code>true</code> if strict 
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      *        <code>Format</code> parsing should be used.
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      */
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     public PercentValidator(boolean strict) {
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         super(strict, PERCENT_FORMAT, true);
 80  4
     }
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 82  
     /**
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      * <p>Parse the value with the specified <code>Format</code>.</p>
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      * 
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      * <p>This implementation is lenient whether the currency symbol
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      *    is present or not. The default <code>NumberFormat</code>
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      *    behaviour is for the parsing to "fail" if the currency
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      *    symbol is missing. This method re-parses with a format
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      *    without the currency symbol if it fails initially.</p>
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      * 
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      * @param value The value to be parsed.
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      * @param formatter The Format to parse the value with.
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      * @return The parsed value if valid or <code>null</code> if invalid.
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      */
 95  
     protected Object parse(String value, Format formatter) {
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 97  
         // Initial parse of the value
 98  13
         BigDecimal parsedValue = (BigDecimal)super.parse(value, formatter);
 99  13
         if (parsedValue != null || !(formatter instanceof DecimalFormat)) {
 100  7
             return parsedValue;
 101  
         }
 102  
 
 103  
         // Re-parse using a pattern without the percent symbol
 104  6
         DecimalFormat decimalFormat = (DecimalFormat)formatter;
 105  6
         String pattern = decimalFormat.toPattern();
 106  6
         if (pattern.indexOf(PERCENT_SYMBOL) >= 0) {
 107  6
             StringBuffer buffer = new StringBuffer(pattern.length());
 108  42
             for (int i = 0; i < pattern.length(); i++) {
 109  36
                 if (pattern.charAt(i) != PERCENT_SYMBOL) {
 110  30
                     buffer.append(pattern.charAt(i));
 111  
                 }
 112  
             }
 113  6
             decimalFormat.applyPattern(buffer.toString());
 114  6
             parsedValue = (BigDecimal)super.parse(value, decimalFormat);
 115  
             
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             // If parsed OK, divide by 100 to get percent
 117  6
             if (parsedValue != null) {
 118  2
                 parsedValue = parsedValue.multiply(POINT_ZERO_ONE);
 119  
             }
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 121  
         }
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         return parsedValue;
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     }
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 }

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