src/jdk.internal.opt/share/classes/jdk/internal/joptsimple/util/EnumConverter.java

/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * The MIT License
 *
 * Copyright (c) 2004-2014 Paul R. Holser, Jr.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package jdk.internal.joptsimple.util;

import java.text.MessageFormat;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.ResourceBundle;

import jdk.internal.joptsimple.ValueConversionException;
import jdk.internal.joptsimple.ValueConverter;

/**
 * Converts values to {@link java.lang.Enum}s.
 *
 * @author <a href="mailto:christian.ohr@gmail.com">Christian Ohr</a>
 */
public abstract class EnumConverter<E extends Enum<E>> implements ValueConverter<E> {
    private final Class<E> clazz;

    private String delimiters = "[,]";

    /**
     * This constructor must be called by subclasses, providing the enum class as the parameter.
     *
     * @param clazz enum class
     */
    protected EnumConverter( Class<E> clazz ) {
        this.clazz = clazz;
    }

    @Override
    public E convert( String value ) {
        for ( E each : valueType().getEnumConstants() ) {
            if ( each.name().equalsIgnoreCase( value ) ) {
                return each;
            }
        }

        throw new ValueConversionException( message( value ) );
    }

    @Override
    public Class<E> valueType() {
        return clazz;
    }

    /**
     * Sets the delimiters for the message string. Must be a 3-letter string,
     * where the first character is the prefix, the second character is the
     * delimiter between the values, and the 3rd character is the suffix.
     *
     * @param delimiters delimiters for message string. Default is [,]
     */
    public void setDelimiters( String delimiters ) {
        this.delimiters = delimiters;
    }

    @Override
    public String valuePattern() {
        EnumSet<E> values = EnumSet.allOf( valueType() );

        StringBuilder builder = new StringBuilder();
        builder.append( delimiters.charAt(0) );
        for ( Iterator<E> i = values.iterator(); i.hasNext(); ) {
            builder.append( i.next().toString() );
            if ( i.hasNext() )
                builder.append( delimiters.charAt( 1 ) );
        }
        builder.append( delimiters.charAt( 2 ) );

        return builder.toString();
    }

    private String message( String value ) {
        ResourceBundle bundle = ResourceBundle.getBundle( "jdk.internal.joptsimple.ExceptionMessages" );
        Object[] arguments = new Object[] { value, valuePattern() };
        String template = bundle.getString( EnumConverter.class.getName() + ".message" );
        return new MessageFormat( template ).format( arguments );
    }
}