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WildcardedUnresolvedType.java

/* *******************************************************************
 * Copyright (c) 2008 Contributors
 * 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: 
 *     Andy Clement     initial implementation 
 * ******************************************************************/
package org.aspectj.weaver;

/**
 * Represents a wildcarded bound for a generic type, this can be unbounded '?' or bounded via extends '? extends Foo' or
 * super '? super Foo'. The signature for a ? is in fact "*" and the erasure signature is the upper bound which defaults
 * to java.lang.Object if nothing is specified. On resolution, this becomes a BoundedReferenceType
 * 
 * @author Andy Clement
 */
00021 public class WildcardedUnresolvedType extends UnresolvedType {

    // TODO does not cope with extra bounds '? extends A & B & C'
    
    public static final int UNBOUND = 0;

    public static final int EXTENDS = 1;

    public static final int SUPER = 2;
    
    public static final WildcardedUnresolvedType QUESTIONMARK = new WildcardedUnresolvedType("*", UnresolvedType.OBJECT, null);

    private int boundKind = UNBOUND; // UNBOUND, EXTENDS, SUPER

    private UnresolvedType lowerBound;

    private UnresolvedType upperBound;

    public WildcardedUnresolvedType(String signature, UnresolvedType upperBound, UnresolvedType lowerBound) {
        super(signature, (upperBound == null ? UnresolvedType.OBJECT.signature : upperBound.signatureErasure));
        this.typeKind = TypeKind.WILDCARD;
        this.upperBound = upperBound;
        this.lowerBound = lowerBound;
        if (signature.charAt(0) == '-') boundKind = SUPER;
        if (signature.charAt(0) == '+') boundKind = EXTENDS;
    }

    public UnresolvedType getUpperBound() {
        return upperBound;
    }

    public UnresolvedType getLowerBound() {
        return lowerBound;
    }

    public boolean isExtends() {
        return boundKind == EXTENDS;
    }

    public boolean isSuper() {
        return boundKind == SUPER;
    }

    public boolean isUnbound() {
        return boundKind == UNBOUND;
    }


}

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