TypeConverter.java

/**************************************************************************************
 * Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved.                 *
 * http://aspectwerkz.codehaus.org                                                    *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the LGPL license      *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package org.codehaus.aspectwerkz.reflect;

/**
 * Methods to convert Class to Java type names. Handles array types and the constructor "return" type.
 *
 * @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r </a>
 * @author <a href="mailto:vta@medios.fi">Tibor Varga </a>
 */
public class TypeConverter {
    /**
     * Converts an array of Classes to their Java language declaration equivalents.
     *
     * @param types is the array of <code>Class</code> objects.
     * @return an array of Strings representing the given types. For <code>null</code> types, this method returns
     *         "void"s.
     */
    public static String[] convertTypeToJava(final Class[] types) {
        String[] parameterTypeNames = new String[types.length];
        for (int i = 0; i < types.length; i++) {
            parameterTypeNames[i] = convertTypeToJava(types[i]);
        }
        return parameterTypeNames;
    }

    /**
     * Converts a Class to its Java language declaration equivalent.
     *
     * @param type is the <code>Class</code> object.
     * @return a Strings representing the given types. For <code>null</code> type, this method returns "void".
     */
    public static String convertTypeToJava(final Class type) {
        String rv = null;

        // constructor return type can be null
        if (type != null) {
            StringBuffer dim = new StringBuffer();
            Class componentType = type.getComponentType();
            for (Class nestedType = type; nestedType.isArray(); nestedType = nestedType.getComponentType()) {
                dim.append("[]");
            }

            // Found a component type => we had an array
            if (dim.length() > 0) {
                rv = componentType.getName() + dim;
            } else {
                rv = type.getName();
            }
        } else {
            rv = "void";
        }
        return rv;
    }
}