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All Roads Lead to ROME. ROME is a set of Atom/RSS Java utilities that make it easy to work in Java with most syndication formats. Today it accepts all flavors of RSS (0.90, 0.91, 0.92, 0.93, 0.94, 1.0 and 2.0), Atom 0.3 and Atom 1.0 feeds. Rome includes a set of parsers and generators for the various flavors of feeds, as well as converters to convert from one format to another. The parsers can give you back Java objects that are either specific for the format you want to work with, or a generic normalized SyndFeed object that lets you work on with the data without bothering about the underlying format.

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/*
 * Licensed 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.
 */

/*
 * This class was copied from OpenBeans (Apache Harmony) and modified to
 * avoid using java.beans package, because it is not available on some
 * platforms (Android in particular).
 */

package com.rometools.rome.feed.impl;

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

public class PropertyDescriptor {

    private final String name;
    private final Method getter;
    private final Method setter;

    public PropertyDescriptor(String name, Method getter, Method setter) {
        if (name == null || name.isEmpty()) {
            throw new IllegalArgumentException("Bad property name");
        }

        this.name = name;
        this.getter = checkGetter(getter);
        this.setter = checkSetter(setter);
    }

    public String getName() {
        return name;
    }

    public Method getReadMethod() {
        return getter;
    }

    public Method getWriteMethod() {
        return setter;
    }

    public Class getPropertyType() {
        if (getter != null) {
            return getter.getReturnType();
        } else if (setter != null) {
            Class[] parameterTypes = setter.getParameterTypes();
            return parameterTypes[0];
        } else {
            return null;
        }
    }

    private Method checkGetter(Method method) {
        if (method != null) {
            int modifiers = method.getModifiers();
            if (!Modifier.isPublic(modifiers)) {
                throw new IllegalArgumentException("Modifier for getter method should be public");
            }
            Class[] parameterTypes = method.getParameterTypes();
            if (parameterTypes.length != 0) {
                throw new IllegalArgumentException("Number of parameters in getter method is not equal to 0");
            }
            Class returnType = method.getReturnType();
            if (returnType.equals(Void.TYPE)) {
                throw new IllegalArgumentException("Getter has return type void");
            }
            Class propertyType = getPropertyType();
            if (propertyType != null && !returnType.equals(propertyType)) {
                throw new IllegalArgumentException("Parameter type in getter does not correspond to setter");
            }
        }
        return method;
    }

    private Method checkSetter(Method method) {
        if (method != null) {
            int modifiers = method.getModifiers();
            if (!Modifier.isPublic(modifiers)) {
                throw new IllegalArgumentException("Modifier for setter method should be public");
            }
            Class[] parameterTypes = method.getParameterTypes();
            if (parameterTypes.length != 1) {
                throw new IllegalArgumentException("Number of parameters in setter method is not equal to 1");
            }
            Class parameterType = parameterTypes[0];
            Class propertyType = getPropertyType();
            if (propertyType != null && !propertyType.equals(parameterType)) {
                throw new IllegalArgumentException("Parameter type in setter does not correspond to getter");
            }
        }
        return method;
    }
}