com.isotrol.impe3.core.component.DirectInjectors.java Source code

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Here is the source code for com.isotrol.impe3.core.component.DirectInjectors.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.isotrol.impe3.core.component;

import static com.isotrol.impe3.core.component.Components.IS_BE_INJECTABLE;
import static com.isotrol.impe3.core.component.Components.IS_DIRECT_INJECTABLE;

import java.lang.reflect.Method;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableMultimap;
import com.isotrol.impe3.api.component.Component;
import com.isotrol.impe3.api.component.Inject;
import com.isotrol.impe3.api.component.InjectBindingErrors;
import com.isotrol.impe3.api.content.Listing;

/**
 * Collection of direct injectors.
 * @author Andres Rodriguez
 * @param <T> Target component type.
 */
public final class DirectInjectors<T extends Component> extends Injectors<T> {
    private final ImmutableMultimap<Class<?>, DirectInjector> injectors;

    static <T extends Component> DirectInjectors<T> direct(Class<T> type, Iterable<Method> methods) {
        return new DirectInjectors<T>(type, IS_DIRECT_INJECTABLE, filter(methods, Inject.class));
    }

    static <T extends Component> DirectInjectors<T> bindingErrors(Class<T> type, Iterable<Method> methods) {
        return new DirectInjectors<T>(type, IS_BE_INJECTABLE, filter(methods, InjectBindingErrors.class));
    }

    private DirectInjectors(final Class<T> type, final Predicate<Class<?>> valid, Iterable<Method> methods) {
        super(type);
        final ImmutableMultimap.Builder<Class<?>, DirectInjector> builder = ImmutableMultimap.builder();
        for (Method m : methods) {
            final DirectInjector i = new DirectInjector(m, valid);
            Class<?> pt = i.getParameterType();
            if (Listing.class.isAssignableFrom(pt)) {
                pt = Listing.class;
            }
            builder.put(pt, i);
        }
        this.injectors = builder.build();
    }

    @Override
    public boolean isEmpty() {
        return injectors.isEmpty();
    }

    Iterable<Class<?>> getInjectedTypes() {
        return injectors.keySet();
    }

    /**
     * Performs a direct injection.
     * @param target Target object.
     * @param valueType Value type.
     * @param value Value to inject.
     */
    public final void inject(Object target, Class<?> valueType, Object value) {
        for (final DirectInjector i : injectors.get(valueType)) {
            i.inject(target, value);
        }
    }

    /**
     * A direct injector.
     * @author Andres Rodriguez
     */
    private class DirectInjector extends Injector {
        DirectInjector(final Method method, final Predicate<Class<?>> valid) {
            super(method);
            if (!valid.apply(getParameterType())) {
                throw new IllegalInjectionMethodException(getType(), method);
            }
        }

        /**
         * Injects the value.
         * @param target Target object.
         * @param value Value to inject.
         */
        public final void inject(Object target, Object value) {
            invoke(target, value);
        }
    }
}