Source Code Cross Referenced for CustomNumberEditor.java in  » J2EE » spring-framework-2.0.6 » org » springframework » beans » propertyeditors » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.beans.propertyeditors 
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.beans.propertyeditors;
018:
019:        import java.beans.PropertyEditorSupport;
020:        import java.text.NumberFormat;
021:
022:        import org.springframework.util.NumberUtils;
023:        import org.springframework.util.StringUtils;
024:
025:        /**
026:         * Property editor for any Number subclass like Integer, Long, Float, Double.
027:         * Can use a given NumberFormat for (locale-specific) parsing and rendering,
028:         * or alternatively the default <code>valueOf</code> respectively
029:         * <code>toString</code> methods.
030:         *
031:         * <p>This is not meant to be used as system PropertyEditor but rather as
032:         * locale-specific number editor within custom controller code, to parse
033:         * user-entered number strings into Number properties of beans, and render
034:         * them in the UI form.
035:         *
036:         * <p>In web MVC code, this editor will typically be registered with
037:         * <code>binder.registerCustomEditor</code> calls in an implementation
038:         * of BaseCommandController's <code>initBinder</code> method.
039:         *
040:         * @author Juergen Hoeller
041:         * @since 06.06.2003
042:         * @see java.lang.Number
043:         * @see java.text.NumberFormat
044:         * @see org.springframework.validation.DataBinder#registerCustomEditor
045:         * @see org.springframework.web.servlet.mvc.BaseCommandController#initBinder
046:         */
047:        public class CustomNumberEditor extends PropertyEditorSupport {
048:
049:            private final Class numberClass;
050:
051:            private final NumberFormat numberFormat;
052:
053:            private final boolean allowEmpty;
054:
055:            /**
056:             * Create a new CustomNumberEditor instance, using the default
057:             * <code>valueOf</code> methods for parsing and <code>toString</code>
058:             * methods for rendering.
059:             * <p>The "allowEmpty" parameter states if an empty String should
060:             * be allowed for parsing, i.e. get interpreted as <code>null</code>  value.
061:             * Else, an IllegalArgumentException gets thrown in that case.
062:             * @param numberClass Number subclass to generate
063:             * @param allowEmpty if empty strings should be allowed
064:             * @throws IllegalArgumentException if an invalid numberClass has been specified
065:             * @see org.springframework.util.NumberUtils#parseNumber(String, Class)
066:             * @see Integer#valueOf
067:             * @see Integer#toString
068:             */
069:            public CustomNumberEditor(Class numberClass, boolean allowEmpty)
070:                    throws IllegalArgumentException {
071:                this (numberClass, null, allowEmpty);
072:            }
073:
074:            /**
075:             * Create a new CustomNumberEditor instance, using the given NumberFormat
076:             * for parsing and rendering.
077:             * <p>The allowEmpty parameter states if an empty String should
078:             * be allowed for parsing, i.e. get interpreted as <code>null</code>  value.
079:             * Else, an IllegalArgumentException gets thrown in that case.
080:             * @param numberClass Number subclass to generate
081:             * @param numberFormat NumberFormat to use for parsing and rendering
082:             * @param allowEmpty if empty strings should be allowed
083:             * @throws IllegalArgumentException if an invalid numberClass has been specified
084:             * @see org.springframework.util.NumberUtils#parseNumber(String, Class, java.text.NumberFormat)
085:             * @see java.text.NumberFormat#parse
086:             * @see java.text.NumberFormat#format
087:             */
088:            public CustomNumberEditor(Class numberClass,
089:                    NumberFormat numberFormat, boolean allowEmpty)
090:                    throws IllegalArgumentException {
091:
092:                if (numberClass == null
093:                        || !Number.class.isAssignableFrom(numberClass)) {
094:                    throw new IllegalArgumentException(
095:                            "Property class must be a subclass of Number");
096:                }
097:                this .numberClass = numberClass;
098:                this .numberFormat = numberFormat;
099:                this .allowEmpty = allowEmpty;
100:            }
101:
102:            /**
103:             * Parse the Number from the given text, using the specified NumberFormat.
104:             */
105:            public void setAsText(String text) throws IllegalArgumentException {
106:                if (this .allowEmpty && !StringUtils.hasText(text)) {
107:                    // Treat empty String as null value.
108:                    setValue(null);
109:                } else if (this .numberFormat != null) {
110:                    // Use given NumberFormat for parsing text.
111:                    setValue(NumberUtils.parseNumber(text, this .numberClass,
112:                            this .numberFormat));
113:                } else {
114:                    // Use default valueOf methods for parsing text.
115:                    setValue(NumberUtils.parseNumber(text, this .numberClass));
116:                }
117:            }
118:
119:            /**
120:             * Coerce a Number value into the required target class, if necessary.
121:             */
122:            public void setValue(Object value) {
123:                if (value instanceof  Number) {
124:                    super .setValue(NumberUtils.convertNumberToTargetClass(
125:                            (Number) value, this .numberClass));
126:                } else {
127:                    super .setValue(value);
128:                }
129:            }
130:
131:            /**
132:             * Format the Number as String, using the specified NumberFormat.
133:             */
134:            public String getAsText() {
135:                Object value = getValue();
136:                if (value == null) {
137:                    return "";
138:                }
139:                if (this .numberFormat != null) {
140:                    // Use NumberFormat for rendering value.
141:                    return this .numberFormat.format(value);
142:                } else {
143:                    // Use toString method for rendering value.
144:                    return value.toString();
145:                }
146:            }
147:
148:        }
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