org.directwebremoting.convert.ObjectConverter Maven / Gradle / Ivy

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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.
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package org.directwebremoting.convert;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.FieldProperty;
import org.directwebremoting.extend.InboundContext;
import org.directwebremoting.extend.Property;
import org.directwebremoting.util.LocalUtil;

/**
 * Convert a Javascript associative array into a JavaBean
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ObjectConverter extends BasicObjectConverter
{
    @Override
    protected Object createParameterInstance(Class paramType) throws InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {
        if (force)
        {
            try
            {
                Constructor ctor = paramType.getDeclaredConstructor();
                LocalUtil.makeAccessible(ctor);
                return ctor.newInstance();
            }
            catch (NoSuchMethodException e)
            {
                throw new InstantiationException("No-arg constructor doesn't exist");
            }
            catch (InvocationTargetException e)
            {
                throw new InstantiationException("No-arg constructor could not be instantiated");
            }
        }
        return super.createParameterInstance(paramType);
    }

    /**
     * Do we force accessibility for private fields
     * @param force "true|false" to set the force accessibility flag
     */
    public void setForce(String force)
    {
        this.force = Boolean.valueOf(force);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.NamedConverter#getPropertyMapFromObject(java.lang.Object, boolean, boolean)
     */
    public Map getPropertyMapFromObject(Object example, boolean readRequired, boolean writeRequired) throws ConversionException
    {
        Class clazz = example.getClass();
        return getPropertyMapFromClass(clazz, readRequired, writeRequired);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.NamedConverter#getPropertyMapFromClass(java.lang.Class, boolean, boolean)
     */
    public Map getPropertyMapFromClass(Class type, boolean readRequired, boolean writeRequired)
    {
        Map allFields = new HashMap();

        while (type != Object.class)
        {
            Field[] fields = type.getDeclaredFields();

            fieldLoop:
            for (Field field : fields)
            {
                String name = field.getName();

                // We don't marshall getClass()
                if ("class".equals(name))
                {
                    continue fieldLoop;
                }

                // Access rules mean we might not want to do this one
                if (!isAllowedByIncludeExcludeRules(name))
                {
                    continue fieldLoop;
                }

                if (!Modifier.isPublic(field.getModifiers()))
                {
                    if (force && !isAspectjJoinPoint(field))
                    {
                        field.setAccessible(true);
                    }
                    else
                    {
                        continue fieldLoop;
                    }
                }

                allFields.put(name, new FieldProperty(field));
            }

            type = type.getSuperclass();
        }

        return allFields;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.convert.BasicObjectConverter#createTypeHintContext(org.directwebremoting.extend.InboundContext, org.directwebremoting.extend.Property)
     */
    @Override
    protected Property createTypeHintContext(InboundContext inctx, Property property)
    {
        return inctx.getCurrentProperty();
    }

    /**
     * Detect synthetic fields generated by Aspect/J.
     * @param field ...
     * @return ...
     */
    protected boolean isAspectjJoinPoint(Field field)
    {
        if (field.getName().startsWith("ajc$tjp_") && field.getType().getName().contains("org.aspectj")) {
            return true;
        }

        return false;
    }

    /**
     * Do we force accessibility for hidden fields
     */
    private boolean force = false;
}