Source Code Cross Referenced for CharacterEditor.java in  » J2EE » spring-framework-2.5 » 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 2.5 » 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:
021:        import org.springframework.util.StringUtils;
022:
023:        /**
024:         * Editor for a {@link java.lang.Character}, to populate a property
025:         * of type <code>Character</code> or <code>char</code> from a String value.
026:         *
027:         * <p>Note that the JDK does not contain a default
028:         * {@link java.beans.PropertyEditor property editor} for <code>char</code>!
029:         * {@link org.springframework.beans.BeanWrapperImpl} will register this
030:         * editor by default.
031:         * 
032:         * <p>Also supports conversion from a Unicode character sequence; e.g.
033:         * <code>u0041</code> ('A').
034:         *
035:         * @author Juergen Hoeller
036:         * @author Rob Harrop
037:         * @author Rick Evans
038:         * @since 1.2
039:         * @see java.lang.Character
040:         * @see org.springframework.beans.BeanWrapperImpl
041:         */
042:        public class CharacterEditor extends PropertyEditorSupport {
043:
044:            /**
045:             * The prefix that identifies a string as being a Unicode character sequence.
046:             */
047:            private static final String UNICODE_PREFIX = "\\u";
048:
049:            /**
050:             * The length of a Unicode character sequence.
051:             */
052:            private static final int UNICODE_LENGTH = 6;
053:
054:            private final boolean allowEmpty;
055:
056:            /**
057:             * Create a new CharacterEditor instance.
058:             * <p>The "allowEmpty" parameter controls whether an empty String is
059:             * to be allowed in parsing, i.e. be interpreted as the <code>null</code>
060:             * value when {@link #setAsText(String) text is being converted}. If
061:             * <code>false</code>, an {@link IllegalArgumentException} will be thrown
062:             * at that time.
063:             * @param allowEmpty if empty strings are to be allowed
064:             */
065:            public CharacterEditor(boolean allowEmpty) {
066:                this .allowEmpty = allowEmpty;
067:            }
068:
069:            public void setAsText(String text) throws IllegalArgumentException {
070:                if (this .allowEmpty && !StringUtils.hasText(text)) {
071:                    // Treat empty String as null value.
072:                    setValue(null);
073:                } else if (text == null) {
074:                    throw new IllegalArgumentException(
075:                            "null String cannot be converted to char type");
076:                } else if (isUnicodeCharacterSequence(text)) {
077:                    setAsUnicode(text);
078:                } else if (text.length() != 1) {
079:                    throw new IllegalArgumentException("String [" + text
080:                            + "] with length " + text.length()
081:                            + " cannot be converted to char type");
082:                } else {
083:                    setValue(new Character(text.charAt(0)));
084:                }
085:            }
086:
087:            public String getAsText() {
088:                Object value = getValue();
089:                return (value != null ? value.toString() : "");
090:            }
091:
092:            private void setAsUnicode(String text) {
093:                int code = Integer.parseInt(text.substring(UNICODE_PREFIX
094:                        .length()), 16);
095:                setValue(new Character((char) code));
096:            }
097:
098:            private static boolean isUnicodeCharacterSequence(String sequence) {
099:                return sequence.startsWith(UNICODE_PREFIX)
100:                        && sequence.length() == UNICODE_LENGTH;
101:            }
102:
103:        }
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