proposal/mutant/src/main/org/apache/ant/component/core/EnumeratedAttributeConverter.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.ant.component.core;

import org.apache.ant.core.execution.*;
import org.apache.ant.core.types.EnumeratedAttribute;

/**
 * Convert between a string and an enumeration
 *
 * @author <a href="mailto:conor@apache.org">Conor MacNeill</a>
 */
public class EnumeratedAttributeConverter implements AntConverter {
    private ExecutionFrame frame;
    
    public void init(ExecutionFrame frame) {
        this.frame = frame;
    }
    
    public Object convert(String value, Class type) throws ConversionException {
        // The string represents a value
        // get the frame's URL
        try {
            Object instance = type.newInstance();
            if (!(instance instanceof EnumeratedAttribute)) {
                throw new ConversionException("The type " + type.getName() 
                                             + " is not a subclass of EnumeratedAttribute");
            }
            EnumeratedAttribute enum = (EnumeratedAttribute)instance;
            enum.setValue(value.trim());
            return enum;
        }
        catch (InstantiationException e) {
            throw new ConversionException("Unable to instantiate the enumerated type "
                                          + type.getName());
        }
        catch (IllegalAccessException e) {
            throw new ConversionException("Illegale access when instantiation enumerated type "
                                          + type.getName());
        }
        catch (ExecutionException e) {
            throw new ConversionException("Unable to set the value of the enumerated type "
                                          + type.getName() + ": " + e.getMessage());
        }                                                      
    }
}