/*
 * JBoss, Home of Professional Open Source
 * Copyright 2014, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.weld.util.reflection;

import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;

/**
 * Implementation of {@link WildcardType}.
 *
 * Per JLS a wildcard may define either the upper bound or the lower bound. A wildcard may not have multiple bounds.
 *
 * @author Jozef Hartinger
 *
 */
public class WildcardTypeImpl implements WildcardType {

    public static WildcardType defaultInstance() {
        return DEFAULT_INSTANCE;
    }

    public static WildcardType withUpperBound(Type type) {
        return new WildcardTypeImpl(new Type[] { type }, DEFAULT_LOWER_BOUND);
    }

    public static WildcardType withLowerBound(Type type) {
        return new WildcardTypeImpl(DEFAULT_UPPER_BOUND, new Type[] { type });
    }

    private static final Type[] DEFAULT_UPPER_BOUND = new Type[] { Object.class };
    private static final Type[] DEFAULT_LOWER_BOUND = new Type[0];
    private static final WildcardType DEFAULT_INSTANCE = new WildcardTypeImpl(DEFAULT_UPPER_BOUND, DEFAULT_LOWER_BOUND);

    private final Type[] upperBound;
    private final Type[] lowerBound;

    private WildcardTypeImpl(Type[] upperBound, Type[] lowerBound) {
        this.upperBound = upperBound;
        this.lowerBound = lowerBound;
    }

    @Override
    public Type[] getUpperBounds() {
        return upperBound;
    }

    @Override
    public Type[] getLowerBounds() {
        return lowerBound;
    }
}