Source Code Cross Referenced for NumberUtils.java in  » J2EE » spring-framework-2.5 » org » springframework » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.util;
018:
019:        import java.math.BigDecimal;
020:        import java.math.BigInteger;
021:        import java.text.NumberFormat;
022:        import java.text.ParseException;
023:
024:        /**
025:         * Miscellaneous utility methods for number conversion and parsing.
026:         * Mainly for internal use within the framework; consider Jakarta's
027:         * Commons Lang for a more comprehensive suite of string utilities.
028:         *
029:         * @author Juergen Hoeller
030:         * @author Rob Harrop
031:         * @since 1.1.2
032:         */
033:        public abstract class NumberUtils {
034:
035:            /**
036:             * Convert the given number into an instance of the given target class.
037:             * @param number the number to convert
038:             * @param targetClass the target class to convert to
039:             * @return the converted number
040:             * @throws IllegalArgumentException if the target class is not supported
041:             * (i.e. not a standard Number subclass as included in the JDK)
042:             * @see java.lang.Byte
043:             * @see java.lang.Short
044:             * @see java.lang.Integer
045:             * @see java.lang.Long
046:             * @see java.math.BigInteger
047:             * @see java.lang.Float
048:             * @see java.lang.Double
049:             * @see java.math.BigDecimal
050:             */
051:            public static Number convertNumberToTargetClass(Number number,
052:                    Class targetClass) throws IllegalArgumentException {
053:
054:                Assert.notNull(number, "Number must not be null");
055:                Assert.notNull(targetClass, "Target class must not be null");
056:
057:                if (targetClass.isInstance(number)) {
058:                    return number;
059:                } else if (targetClass.equals(Byte.class)) {
060:                    long value = number.longValue();
061:                    if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE) {
062:                        raiseOverflowException(number, targetClass);
063:                    }
064:                    return new Byte(number.byteValue());
065:                } else if (targetClass.equals(Short.class)) {
066:                    long value = number.longValue();
067:                    if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
068:                        raiseOverflowException(number, targetClass);
069:                    }
070:                    return new Short(number.shortValue());
071:                } else if (targetClass.equals(Integer.class)) {
072:                    long value = number.longValue();
073:                    if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
074:                        raiseOverflowException(number, targetClass);
075:                    }
076:                    return new Integer(number.intValue());
077:                } else if (targetClass.equals(Long.class)) {
078:                    return new Long(number.longValue());
079:                } else if (targetClass.equals(Float.class)) {
080:                    return new Float(number.floatValue());
081:                } else if (targetClass.equals(Double.class)) {
082:                    return new Double(number.doubleValue());
083:                } else if (targetClass.equals(BigInteger.class)) {
084:                    return BigInteger.valueOf(number.longValue());
085:                } else if (targetClass.equals(BigDecimal.class)) {
086:                    // using BigDecimal(String) here, to avoid unpredictability of BigDecimal(double)
087:                    // (see BigDecimal javadoc for details)
088:                    return new BigDecimal(number.toString());
089:                } else {
090:                    throw new IllegalArgumentException(
091:                            "Could not convert number [" + number
092:                                    + "] of type ["
093:                                    + number.getClass().getName()
094:                                    + "] to unknown target class ["
095:                                    + targetClass.getName() + "]");
096:                }
097:            }
098:
099:            /**
100:             * Raise an overflow exception for the given number and target class.
101:             * @param number the number we tried to convert
102:             * @param targetClass the target class we tried to convert to
103:             */
104:            private static void raiseOverflowException(Number number,
105:                    Class targetClass) {
106:                throw new IllegalArgumentException("Could not convert number ["
107:                        + number + "] of type [" + number.getClass().getName()
108:                        + "] to target class [" + targetClass.getName()
109:                        + "]: overflow");
110:            }
111:
112:            /**
113:             * Parse the given text into a number instance of the given target class,
114:             * using the corresponding default <code>decode</code> methods. Trims the
115:             * input <code>String</code> before attempting to parse the number. Supports
116:             * numbers in hex format (with leading 0x) and in octal format (with leading 0).
117:             * @param text the text to convert
118:             * @param targetClass the target class to parse into
119:             * @return the parsed number
120:             * @throws IllegalArgumentException if the target class is not supported
121:             * (i.e. not a standard Number subclass as included in the JDK)
122:             * @see java.lang.Byte#decode
123:             * @see java.lang.Short#decode
124:             * @see java.lang.Integer#decode
125:             * @see java.lang.Long#decode
126:             * @see #decodeBigInteger(String)
127:             * @see java.lang.Float#valueOf
128:             * @see java.lang.Double#valueOf
129:             * @see java.math.BigDecimal#BigDecimal(String)
130:             */
131:            public static Number parseNumber(String text, Class targetClass) {
132:                Assert.notNull(text, "Text must not be null");
133:                Assert.notNull(targetClass, "Target class must not be null");
134:
135:                String trimmed = text.trim();
136:
137:                if (targetClass.equals(Byte.class)) {
138:                    return Byte.decode(trimmed);
139:                } else if (targetClass.equals(Short.class)) {
140:                    return Short.decode(trimmed);
141:                } else if (targetClass.equals(Integer.class)) {
142:                    return Integer.decode(trimmed);
143:                } else if (targetClass.equals(Long.class)) {
144:                    return Long.decode(trimmed);
145:                } else if (targetClass.equals(BigInteger.class)) {
146:                    return decodeBigInteger(trimmed);
147:                } else if (targetClass.equals(Float.class)) {
148:                    return Float.valueOf(trimmed);
149:                } else if (targetClass.equals(Double.class)) {
150:                    return Double.valueOf(trimmed);
151:                } else if (targetClass.equals(BigDecimal.class)
152:                        || targetClass.equals(Number.class)) {
153:                    return new BigDecimal(trimmed);
154:                } else {
155:                    throw new IllegalArgumentException(
156:                            "Cannot convert String [" + text
157:                                    + "] to target class ["
158:                                    + targetClass.getName() + "]");
159:                }
160:            }
161:
162:            /**
163:             * Parse the given text into a number instance of the given target class,
164:             * using the given NumberFormat. Trims the input <code>String</code>
165:             * before attempting to parse the number.
166:             * @param text the text to convert
167:             * @param targetClass the target class to parse into
168:             * @param numberFormat the NumberFormat to use for parsing (if <code>null</code>,
169:             * this method falls back to <code>parseNumber(String, Class)</code>)
170:             * @return the parsed number
171:             * @throws IllegalArgumentException if the target class is not supported
172:             * (i.e. not a standard Number subclass as included in the JDK)
173:             * @see java.text.NumberFormat#parse
174:             * @see #convertNumberToTargetClass
175:             * @see #parseNumber(String, Class)
176:             */
177:            public static Number parseNumber(String text, Class targetClass,
178:                    NumberFormat numberFormat) {
179:                if (numberFormat != null) {
180:                    Assert.notNull(text, "Text must not be null");
181:                    Assert
182:                            .notNull(targetClass,
183:                                    "Target class must not be null");
184:                    try {
185:                        Number number = numberFormat.parse(text.trim());
186:                        return convertNumberToTargetClass(number, targetClass);
187:                    } catch (ParseException ex) {
188:                        throw new IllegalArgumentException(ex.getMessage());
189:                    }
190:                } else {
191:                    return parseNumber(text, targetClass);
192:                }
193:            }
194:
195:            /**
196:             * Decode a {@link java.math.BigInteger} from a {@link String} value.
197:             * Supports decimal, hex and octal notation.
198:             * @see BigInteger#BigInteger(String, int)
199:             */
200:            private static BigInteger decodeBigInteger(String value) {
201:                int radix = 10;
202:                int index = 0;
203:                boolean negative = false;
204:
205:                // Handle minus sign, if present.
206:                if (value.startsWith("-")) {
207:                    negative = true;
208:                    index++;
209:                }
210:
211:                // Handle radix specifier, if present.
212:                if (value.startsWith("0x", index)
213:                        || value.startsWith("0X", index)) {
214:                    index += 2;
215:                    radix = 16;
216:                } else if (value.startsWith("#", index)) {
217:                    index++;
218:                    radix = 16;
219:                } else if (value.startsWith("0", index)
220:                        && value.length() > 1 + index) {
221:                    index++;
222:                    radix = 8;
223:                }
224:
225:                BigInteger result = new BigInteger(value.substring(index),
226:                        radix);
227:                return (negative ? result.negate() : result);
228:            }
229:
230:        }
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