SlotPropertyDescriptor.java

/*
 * Copyright 2010 Instituto Superior Tecnico
 * 
 *      https://fenix-ashes.ist.utl.pt/
 * 
 *   This file is part of the vaadin-framework.
 *
 *   The vaadin-framework Infrastructure is free software: you can
 *   redistribute it and/or modify it under the terms of the GNU Lesser General
 *   Public License as published by the Free Software Foundation, either version
 *   3 of the License, or (at your option) any later version.*
 *
 *   vaadin-framework is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with vaadin-framework. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package pt.ist.vaadinframework.data.metamodel;

import java.beans.IntrospectionException;
import java.lang.reflect.InvocationTargetException;

import org.apache.commons.lang.StringUtils;

import pt.ist.fenixframework.DomainObject;
import pt.ist.fenixframework.dml.Slot;
import pt.ist.fenixframework.dml.Slot.Option;

import com.vaadin.data.Property.ConversionException;

/**
 * Meta information over a DML slot. Read and write operations are supported
 * using reflection.
 * 
 * @author Pedro Santos (pedro.miguel.santos@ist.utl.pt)
 */
public class SlotPropertyDescriptor extends java.beans.PropertyDescriptor implements PropertyDescriptor {
    private final boolean required;

    SlotPropertyDescriptor(Slot slot, Class<? extends DomainObject> type) throws IntrospectionException {
        super(slot.getName(), type, "get" + StringUtils.capitalize(slot.getName()), "set"
                + StringUtils.capitalize(slot.getName()));
        this.required = slot.getOptions().contains(Option.REQUIRED);
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#getPropertyId()
     */
    @Override
    public String getPropertyId() {
        return getName();
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#getDefaultValue()
     */
    @Override
    public Object getDefaultValue() {
        if (Boolean.class.isAssignableFrom(getPropertyType())) {
            return Boolean.FALSE;
        }
        return null;
    }

    /**
     * @see java.beans.PropertyDescriptor#getPropertyType()
     */
    @Override
    @SuppressWarnings("unchecked")
    public Class<? extends DomainObject> getPropertyType() {
        return (Class<? extends DomainObject>) super.getPropertyType();
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#getCollectionElementType()
     */
    @Override
    public Class<? extends DomainObject> getCollectionElementType() {
        return null;
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#isCollection()
     */
    @Override
    public boolean isCollection() {
        return false;
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#isRequired()
     */
    @Override
    public boolean isRequired() {
        return required;
    }

    /**
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#read(java.lang.Object)
     */
    @Override
    public Object read(Object host) throws ModelIntroscpectionException {
        try {
            return getReadMethod().invoke(host);
        } catch (IllegalArgumentException e) {
            throw new ModelIntroscpectionException(e);
        } catch (IllegalAccessException e) {
            throw new ModelIntroscpectionException(e);
        } catch (InvocationTargetException e) {
            throw new ModelIntroscpectionException(e);
        }
    }

    /**
     * @throws ModelIntroscpectionException
     * @see pt.ist.vaadinframework.data.metamodel.PropertyDescriptor#write(java.lang.Object, java.lang.Object)
     */
    @Override
    public void write(Object host, Object newValue) throws ConversionException {
        try {
            getWriteMethod().invoke(host, newValue);
        } catch (IllegalArgumentException e) {
            throw new ConversionException(e);
        } catch (IllegalAccessException e) {
            throw new ConversionException(e);
        } catch (InvocationTargetException e) {
            throw new ConversionException(e);
        }
    }

}