BeanUtils.java

/*
 * Copyright (c) 2013, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.util.reflection;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;

import org.jowidgets.util.Assert;

public final class BeanUtils {

    private BeanUtils() {}

    public static void setProperty(final Object bean, final String propertyName, final Object value) {
        Assert.paramNotNull(bean, "bean");
        Assert.paramNotNull(propertyName, "propertyName");
        final Method writeMethod = IntrospectionCache.getWriteMethodFromHierarchy(bean.getClass(), propertyName);
        if (writeMethod != null) {
            try {
                writeMethod.invoke(bean, value);
            }
            catch (final Exception e) {
                throw new RuntimeException(e);
            }
        }
        else {
            throw new IllegalArgumentException("No write method found for property '"
                + propertyName
                + "' on bean '"
                + bean
                + "'.");
        }
    }

    public static Object getProperty(final Object bean, final String propertyName) {
        Assert.paramNotNull(bean, "bean");
        Assert.paramNotNull(propertyName, "propertyName");
        final Method readMethod = IntrospectionCache.getReadMethodFromHierarchy(bean.getClass(), propertyName);
        if (readMethod != null) {
            try {
                return readMethod.invoke(bean);
            }
            catch (final Exception e) {
                throw new RuntimeException(e);
            }
        }
        else {
            throw new IllegalArgumentException("No read method found for property '" + propertyName + "' on bean '" + bean + "'.");
        }
    }

    public static List<String> getProperties(final Class<?> beanType) {
        Assert.paramNotNull(beanType, "beanType");
        try {
            final BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
            final List<String> result = new LinkedList<String>();
            for (final PropertyDescriptor propertyDescriptor : beanInfo.getPropertyDescriptors()) {
                final String propertyName = propertyDescriptor.getName();
                result.add(propertyName);
            }
            return result;
        }
        catch (final IntrospectionException e) {
            throw new RuntimeException(e);
        }
    }

    public static List<String> getReadableProperties(final Class<?> beanType) {
        Assert.paramNotNull(beanType, "beanType");
        try {
            final BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
            final List<String> result = new LinkedList<String>();
            for (final PropertyDescriptor propertyDescriptor : beanInfo.getPropertyDescriptors()) {
                final String propertyName = propertyDescriptor.getName();
                if (propertyDescriptor.getReadMethod() != null) {
                    result.add(propertyName);
                }
            }
            return result;
        }
        catch (final IntrospectionException e) {
            throw new RuntimeException(e);
        }
    }
}