org.directwebremoting.extend.PropertyDescriptorProperty Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of dwr Show documentation
DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.
There is a newer version: 5.0.0
Show newest version
package org.directwebremoting.extend;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;

import org.directwebremoting.ConversionException;
import org.directwebremoting.util.LocalUtil;

/**
 * An implementation of {@link Property} that proxies to a {@link PropertyDescriptor}
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PropertyDescriptorProperty implements Property
{
    /**
     * @param descriptor The PropertyDescriptor that we are proxying to
     */
    public PropertyDescriptorProperty(PropertyDescriptor descriptor)
    {
        this.descriptor = descriptor;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getName()
     */
    public String getName()
    {
        return descriptor.getName();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getPropertyType()
     */
    public Class getPropertyType()
    {
        Method readMethod = descriptor.getReadMethod();
        Type[] types = (null != readMethod) ? readMethod.getGenericParameterTypes() : null;
        if (null == types || types.length == 0)
        {
            return descriptor.getPropertyType();
        }
        Type parameterType = types[0];
        return LocalUtil.toClass(parameterType, toString());
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws ConversionException
    {
        try
        {
            return descriptor.getReadMethod().invoke(bean);
        }
        catch (InvocationTargetException ex)
        {
            throw new ConversionException(bean.getClass(), ex.getTargetException());
        }
        catch (Exception ex)
        {
            throw new ConversionException(bean.getClass(), ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws ConversionException
    {
        try
        {
            Method setter = LocalUtil.getWriteMethod(bean.getClass(), descriptor);
            setter.invoke(bean, value);
        }
        catch (InvocationTargetException ex)
        {
            throw new ConversionException(bean.getClass(), ex.getTargetException());
        }
        catch (Exception ex)
        {
            throw new ConversionException(bean.getClass(), ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#createChild(int)
     */
    public Property createChild(int newParameterNumber) throws ConversionException
    {
        Method method = descriptor.getReadMethod();
        if (method == null)
        {
            throw new ConversionException(descriptor.getPropertyType(), "Property \"" + descriptor.getDisplayName() + "\" of type " + descriptor.getPropertyType().getName() + " has no read method (getter).");
        }
        // Type[] types = method.getGenericParameterTypes();
        // if (types.length == 0)
        // {
        //     return new NestedProperty(this, method, null, 0, newParameterNumber);
        // }
        // return new NestedProperty(this, method, types[0], 0, newParameterNumber);

        return new NestedProperty(
            this, method, method.getGenericReturnType(), 0, newParameterNumber);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode()
    {
        return descriptor.getReadMethod().hashCode();
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }

        if (obj == null || this.getClass() != obj.getClass())
        {
            return false;
        }

        PropertyDescriptorProperty that = (PropertyDescriptorProperty) obj;

        if (!this.descriptor.getReadMethod().equals(that.descriptor.getReadMethod()))
        {
            return false;
        }

        return true;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        return "PropertyDescriptorProperty[" + descriptor.getName() + "=" + descriptor.getPropertyType() + "]";
    }

    /**
     * The PropertyDescriptor that we are proxying to
     */
    protected PropertyDescriptor descriptor;

}