mina-integration-beans/src/main/java/org/apache/mina/integration/beans/CharacterEditor.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    http://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.apache.mina.integration.beans;

import java.beans.PropertyEditor;
import java.util.regex.Pattern;

/**
 * A {@link PropertyEditor} which converts a {@link String} into
 * a {@link Character} and vice versa.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class CharacterEditor extends AbstractPropertyEditor {
    private static final Pattern UNICODE = Pattern.compile("\\\\[uU][0-9a-fA-F]+");

    @Override
    protected String toText(Object value) {
        return String.valueOf(value);
    }

    @Override
    protected Object toValue(String text) throws IllegalArgumentException {
        if (text.length() == 0) {
            return Character.valueOf(Character.MIN_VALUE);
        }

        if (UNICODE.matcher(text).matches()) {
            return Character.valueOf((char) Integer.parseInt(text.substring(2)));
        }

        if (text.length() != 1) {
            throw new IllegalArgumentException("Too many characters: " + text);
        }

        return Character.valueOf(text.charAt(0));
    }
}