get Property Descriptors - Java Reflection

Java examples for Reflection:Property

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Description

get Property Descriptors

Demo Code

/*//from   w w  w. j  av a2  s.co m
 * Copyright 2000-2014 Vaadin Ltd.
 * 
 * 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.
 */
//package com.java2s;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;

import java.beans.PropertyDescriptor;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class Main {
    private static List<PropertyDescriptor> getPropertyDescriptors(
            BeanInfo beanInfo) {
        PropertyDescriptor[] descriptors = beanInfo
                .getPropertyDescriptors();
        List<PropertyDescriptor> result = new ArrayList<PropertyDescriptor>(
                descriptors.length);
        for (PropertyDescriptor descriptor : descriptors) {
            try {
                Method readMethod = getMethodFromBridge(descriptor
                        .getReadMethod());
                if (readMethod != null) {
                    Method writeMethod = getMethodFromBridge(
                            descriptor.getWriteMethod(),
                            readMethod.getReturnType());
                    if (writeMethod == null) {
                        writeMethod = descriptor.getWriteMethod();
                    }
                    PropertyDescriptor descr = new PropertyDescriptor(
                            descriptor.getName(), readMethod, writeMethod);
                    result.add(descr);
                } else {
                    result.add(descriptor);
                }
            } catch (SecurityException ignore) {
                // handle next descriptor
            } catch (IntrospectionException e) {
                result.add(descriptor);
            }
        }
        return result;
    }

    /**
     * Return declared method for which {@code bridgeMethod} is generated. If
     * {@code bridgeMethod} is not a bridge method then return null.
     */
    private static Method getMethodFromBridge(Method bridgeMethod)
            throws SecurityException {
        if (bridgeMethod == null) {
            return null;
        }
        return getMethodFromBridge(bridgeMethod,
                bridgeMethod.getParameterTypes());
    }

    /**
     * Return declared method for which {@code bridgeMethod} is generated using
     * its {@code paramTypes}. If {@code bridgeMethod} is not a bridge method
     * then return null.
     */
    private static Method getMethodFromBridge(Method bridgeMethod,
            Class<?>... paramTypes) throws SecurityException {
        if (bridgeMethod == null || !bridgeMethod.isBridge()) {
            return null;
        }
        try {
            return bridgeMethod.getDeclaringClass().getMethod(
                    bridgeMethod.getName(), paramTypes);
        } catch (NoSuchMethodException e) {
            return null;
        }
    }
}

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