/*******************************************************************************
 *
 * Copyright (c) 2004-2010 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *
 *
 *******************************************************************************/ 

package hudson.tools;

import hudson.Functions;
import hudson.model.Describable;
import hudson.model.Descriptor;

import java.util.ArrayList;
import java.util.List;

/**
 * Base {@link Descriptor} type used for {@code XyzProperty} classes.
 *
 * @param <P> Type of the {@code XyzProperty}. Called 'property type'
 * @param <T> Type of the {@code Xyz}, that the property attaches to. Called
 * 'target type'
 * @author Kohsuke Kawaguchi
 * @since 1.305
 */
public abstract class PropertyDescriptor<P extends Describable<P>, T> extends Descriptor<P> {

    protected PropertyDescriptor(Class<? extends P> clazz) {
        super(clazz);
    }

    protected PropertyDescriptor() {
    }

    /**
     * Infer the type parameterization 'P'
     */
    private Class<P> getP() {
        return Functions.getTypeParameter(getClass(), Descriptor.class, 0);
    }

    /**
     * Returns true if this property type is applicable to the given target
     * type.
     *
     * <p> The default implementation of this method checks if the given node
     * type is assignable according to the parameterization, but subtypes can
     * extend this to change this behavior.
     *
     * @return true to indicate applicable, in which case the property will be
     * displayed in the configuration screen of the target, for example.
     */
    public boolean isApplicable(Class<? extends T> targetType) {
        Class<? extends T> applicable = Functions.getTypeParameter(clazz, getP(), 0);
        return applicable.isAssignableFrom(targetType);
    }

    public static <D extends PropertyDescriptor<?, T>, T> List<D> for_(List<D> all, Class<? extends T> target) {
        List<D> result = new ArrayList<D>();
        for (D d : all) {
            if (d.isApplicable(target)) {
                result.add(d);
            }
        }
        return result;
    }

    public static <D extends PropertyDescriptor<?, T>, T> List<D> for_(List<D> all, T target) {
        return for_(all, (Class) target.getClass());
    }
}