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/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.propertyeditors;
import java.beans.PropertyEditorSupport;
import org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;
/**
* Editor for a {@link Character}, to populate a property
* of type {@code Character} or {@code char} from a String value.
*
* Note that the JDK does not contain a default
* {@link java.beans.PropertyEditor property editor} for {@code char}!
* {@link org.springframework.beans.BeanWrapperImpl} will register this
* editor by default.
*
*
Also supports conversion from a Unicode character sequence; e.g.
* {@code u0041} ('A').
*
* @author Juergen Hoeller
* @author Rob Harrop
* @author Rick Evans
* @since 1.2
* @see Character
* @see org.springframework.beans.BeanWrapperImpl
*/
public class CharacterEditor extends PropertyEditorSupport {
/**
* The prefix that identifies a string as being a Unicode character sequence.
*/
private static final String UNICODE_PREFIX = "\\u";
/**
* The length of a Unicode character sequence.
*/
private static final int UNICODE_LENGTH = 6;
private final boolean allowEmpty;
/**
* Create a new CharacterEditor instance.
*
The "allowEmpty" parameter controls whether an empty String is to be
* allowed in parsing, i.e. be interpreted as the {@code null} value when
* {@link #setAsText(String) text is being converted}. If {@code false},
* an {@link IllegalArgumentException} will be thrown at that time.
* @param allowEmpty if empty strings are to be allowed
*/
public CharacterEditor(boolean allowEmpty) {
this.allowEmpty = allowEmpty;
}
@Override
public void setAsText(@Nullable String text) throws IllegalArgumentException {
if (this.allowEmpty && !StringUtils.hasLength(text)) {
// Treat empty String as null value.
setValue(null);
}
else if (text == null) {
throw new IllegalArgumentException("null String cannot be converted to char type");
}
else if (isUnicodeCharacterSequence(text)) {
setAsUnicode(text);
}
else if (text.length() == 1) {
setValue(Character.valueOf(text.charAt(0)));
}
else {
throw new IllegalArgumentException("String [" + text + "] with length " +
text.length() + " cannot be converted to char type: neither Unicode nor single character");
}
}
@Override
public String getAsText() {
Object value = getValue();
return (value != null ? value.toString() : "");
}
private boolean isUnicodeCharacterSequence(String sequence) {
return (sequence.startsWith(UNICODE_PREFIX) && sequence.length() == UNICODE_LENGTH);
}
private void setAsUnicode(String text) {
int code = Integer.parseInt(text.substring(UNICODE_PREFIX.length()), 16);
setValue(Character.valueOf((char) code));
}
}