xml/dom-openapi/src/com/intellij/util/xml/converters/values/NumberValueConverter.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.intellij.util.xml.converters.values;
  18
  19 import com.intellij.util.xml.ConvertContext;
  20 import com.intellij.util.xml.Converter;
  21 import com.intellij.util.xml.DomBundle;
  22 import org.jetbrains.annotations.NonNls;
  23 import org.jetbrains.annotations.NotNull;
  24 import org.jetbrains.annotations.Nullable;
  25
  26 import java.math.BigDecimal;
  27 import java.math.BigInteger;
  28
  29 public class NumberValueConverter extends Converter<String> {
  30
  31   private final Class myNumberClass;
  32   private final boolean myAllowEmpty;
  33
  34
  35   public NumberValueConverter(@NotNull final Class numberClass, final boolean allowEmpty) {
  36     myNumberClass = numberClass;
  37     myAllowEmpty = allowEmpty;
  38   }
  39
  40   public String fromString(@Nullable @NonNls final String s, final ConvertContext context) {
  41     if (s == null) return null;
  42
  43     if (myAllowEmpty && s.trim().length() == 0) return s;
  44
  45     return parseNumber(s, myNumberClass) == null ? null : s;
  46   }
  47
  48   public String toString(@Nullable final String s, final ConvertContext context) {
  49     return null;
  50   }
  51
  52   public String getErrorMessage(@Nullable final String s, final ConvertContext context) {
  53     if (s == null) return super.getErrorMessage(s, context);
  54
  55     return  s.trim().length() == 0 ?
  56           DomBundle.message("value.converter.format.exception.empty.string", myNumberClass.getName()) :
  57           DomBundle.message("value.converter.format.exception", s, myNumberClass.getName());
  58   }
  59
  60   @Nullable
  61   public static Number parseNumber(@NotNull String text, @NotNull Class targetClass) {
  62     try {
  63       String trimmed = text.trim();
  64
  65       if (targetClass.equals(Byte.class) || targetClass.equals(byte.class)) {
  66         return Byte.decode(trimmed);
  67       }
  68       else if (targetClass.equals(Short.class) || targetClass.equals(short.class)) {
  69         return Short.decode(trimmed);
  70       }
  71       else if (targetClass.equals(Integer.class) || targetClass.equals(int.class)) {
  72         return Integer.decode(trimmed);
  73       }
  74       else if (targetClass.equals(Long.class) || targetClass.equals(long.class)) {
  75         return Long.decode(trimmed);
  76       }
  77       else if (targetClass.equals(BigInteger.class)) {
  78         return decodeBigInteger(trimmed);
  79       }
  80       else if (targetClass.equals(Float.class) || targetClass.equals(float.class)) {
  81         return Float.valueOf(trimmed);
  82       }
  83       else if (targetClass.equals(Double.class) || targetClass.equals(double.class)) {
  84         return Double.valueOf(trimmed);
  85       }
  86       else if (targetClass.equals(BigDecimal.class) || targetClass.equals(Number.class)) {
  87         return new BigDecimal(trimmed);
  88       }
  89     } catch (NumberFormatException ex) {
  90       return null;
  91     }
  92     return null;
  93   }
  94
  95   private static BigInteger decodeBigInteger(String value) {
  96     int radix = 10;
  97     int index = 0;
  98     boolean negative = false;
  99
 100     // Handle minus sign, if present.
 101     if (value.startsWith("-")) {
 102       negative = true;
 103       index++;
 104     }
 105
 106     // Handle radix specifier, if present.
 107     if (value.startsWith("0x", index) || value.startsWith("0X", index)) {
 108       index += 2;
 109       radix = 16;
 110     }
 111     else if (value.startsWith("#", index)) {
 112       index++;
 113       radix = 16;
 114     }
 115     else if (value.startsWith("0", index) && value.length() > 1 + index) {
 116       index++;
 117       radix = 8;
 118     }
 119
 120     BigInteger result = new BigInteger(value.substring(index), radix);
 121     return (negative ? result.negate() : result);
 122   }
 123 }