provider/tcp/src/main/java/org/apache/aries/rsa/provider/tcp/ser/DTOUtil.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.aries.rsa.provider.tcp.ser;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * Copied from felix converter as the class there is not public
 */
class DTOUtil {
    private DTOUtil() {
        // Do not instantiate. This is a utility class.
    }

    static boolean isDTOType(Class<?> cls) {
        try {
            cls.getDeclaredConstructor();
        } catch (NoSuchMethodException | SecurityException e) {
            // No zero-arg constructor, not a DTO
            return false;
        }

        if (cls.getDeclaredMethods().length > 0) {
            // should not have any methods
            return false;
        }

        for (Method m : cls.getMethods()) {
            try {
                Object.class.getMethod(m.getName(), m.getParameterTypes());
            } catch (NoSuchMethodException snme) {
                // Not a method defined by Object.class (or override of such
                // method)
                return false;
            }
        }

        boolean foundField = false;
        for (Field f : cls.getFields()) {
            int modifiers = f.getModifiers();
            if (Modifier.isStatic(modifiers)) {
                // ignore static fields
                continue;
            }

            if (!Modifier.isPublic(modifiers)) {
                return false;
            }
            foundField = true;
        }
        return foundField;
    }
}