de.intarsys.tools.functor.FunctorFieldHandler Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of isrt Show documentation
The basic runtime tools and interfaces for intarsys components.
There is a newer version: 4.11
package de.intarsys.tools.functor;

import de.intarsys.tools.attribute.IAttributeSupport;
import de.intarsys.tools.event.EventType;
import de.intarsys.tools.event.INotificationListener;
import de.intarsys.tools.event.INotificationSupport;
import de.intarsys.tools.reflect.FieldAccessException;
import de.intarsys.tools.reflect.IFieldHandler;
import de.intarsys.tools.reflect.ObjectCreationException;

public class FunctorFieldHandler implements IFieldHandler,
		INotificationSupport, IAttributeSupport {

	private IFunctor getter;

	private String name;

	private IFunctor setter;

	public FunctorFieldHandler() {
	}

	public FunctorFieldHandler(String name, IFunctor getter, IFunctor setter) {
		super();
		this.name = name;
		this.getter = getter;
		this.setter = setter;
	}

	public void addNotificationListener(EventType type,
			INotificationListener listener) {
		if (getter instanceof INotificationSupport) {
			((INotificationSupport) getter).addNotificationListener(type,
					listener);
		}
	}

	public Object getAttribute(Object key) {
		if (getter instanceof IAttributeSupport) {
			return ((IAttributeSupport) getter).getAttribute(key);
		}
		return null;
	}

	public IFunctor getGetter() {
		return getter;
	}

	public String getName() {
		return name;
	}

	public IFunctor getSetter() {
		return setter;
	}

	public Object getValue(Object object) throws FieldAccessException {
		if (getter == null) {
			return null;
		}
		IFunctorCall call;
		if (object instanceof IFunctorCallFactory) {
			try {
				call = ((IFunctorCallFactory) object).createFunctorCall(getter,
						object, Args.create());
			} catch (ObjectCreationException e) {
				throw new FieldAccessException(getName(), e);
			}
		} else {
			call = new FunctorCall(object, Args.EMPTY);
		}
		try {
			return getter.perform(call);
		} catch (FunctorInvocationException e) {
			Throwable cause = e.getCause() == null ? e : e.getCause();
			throw new FieldAccessException(getName(), cause);
		}
	}

	public Object removeAttribute(Object key) {
		if (getter instanceof IAttributeSupport) {
			return ((IAttributeSupport) getter).removeAttribute(key);
		}
		return null;
	}

	public void removeNotificationListener(EventType type,
			INotificationListener listener) {
		if (getter instanceof INotificationSupport) {
			((INotificationSupport) getter).removeNotificationListener(type,
					listener);
		}
	}

	public Object setAttribute(Object key, Object value) {
		if (getter instanceof IAttributeSupport) {
			return ((IAttributeSupport) getter).setAttribute(key, value);
		}
		return null;
	}

	public void setGetter(IFunctor getter) {
		this.getter = getter;
	}

	public void setName(String name) {
		this.name = name;
	}

	public void setSetter(IFunctor setter) {
		this.setter = setter;
	}

	public Object setValue(Object object, Object value)
			throws FieldAccessException {
		if (setter == null) {
			return null;
		}
		IFunctorCall call;
		if (object instanceof IFunctorCallFactory) {
			try {
				call = ((IFunctorCallFactory) object).createFunctorCall(setter,
						object, Args.createIndexed(value));
			} catch (ObjectCreationException e) {
				throw new FieldAccessException(getName(), e);
			}
		} else {
			call = new FunctorCall(object, Args.createIndexed(value));
		}
		try {
			return setter.perform(call);
		} catch (FunctorInvocationException e) {
			Throwable cause = e.getCause() == null ? e : e.getCause();
			throw new FieldAccessException(getName(), cause);
		}
	}

}