mina-integration-beans/src/main/java/org/apache/mina/integration/beans/EnumEditor.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.EnumSet;
import java.util.Set;
import java.util.regex.Pattern;

/**
 * A {@link PropertyEditor} which converts a {@link String} into
 * an {@link Enum} and vice versa.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
@SuppressWarnings("unchecked")
public class EnumEditor extends AbstractPropertyEditor {
    private static final Pattern ORDINAL = Pattern.compile("[0-9]+");

    private final Class enumType;

    private final Set<Enum<?>> enums;

    /**
     * Creates a new EnumEditor instance
     * 
     * @param enumType The type of Enum
     */
    public EnumEditor(Class enumType) {
        if (enumType == null) {
            throw new IllegalArgumentException("enumType");
        }

        this.enumType = enumType;
        this.enums = EnumSet.allOf(enumType);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected String toText(Object value) {
        return value == null ? "" : value.toString();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected Object toValue(String text) {
        if (ORDINAL.matcher(text).matches()) {
            int ordinal = Integer.parseInt(text);
            
            for (Enum<?> e : enums) {
                if (e.ordinal() == ordinal) {
                    return e;
                }
            }

            throw new IllegalArgumentException("wrong ordinal: " + ordinal);
        }

        for (Enum<?> e : enums) {
            if (text.equalsIgnoreCase(e.toString())) {
                return e;
            }
        }

        return Enum.valueOf(enumType, text);
    }
}