| /******************************************************************************* |
| * Copyright (c) 2000, 2006 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.corext.refactoring.typeconstraints.types; |
| |
| public final class ExtendsWildcardType extends WildcardType { |
| |
| protected ExtendsWildcardType(TypeEnvironment environment) { |
| super(environment); |
| } |
| |
| public int getKind() { |
| return EXTENDS_WILDCARD_TYPE; |
| } |
| |
| public TType getErasure() { |
| return fBound.getErasure(); |
| } |
| |
| public TType[] getSubTypes() { |
| return new TType[] { fBound }; |
| } |
| |
| protected boolean doCanAssignTo(TType lhs) { |
| switch (lhs.getKind()) { |
| case ARRAY_TYPE: |
| case STANDARD_TYPE: |
| case PARAMETERIZED_TYPE: |
| case RAW_TYPE: |
| return getBound().canAssignTo(lhs); |
| |
| case UNBOUND_WILDCARD_TYPE: |
| return true; |
| case SUPER_WILDCARD_TYPE: |
| case EXTENDS_WILDCARD_TYPE: |
| return ((WildcardType)lhs).checkAssignmentBound(getBound()); |
| |
| case TYPE_VARIABLE: |
| return ((TypeVariable)lhs).checkAssignmentBound(getBound()); |
| case CAPTURE_TYPE: |
| return ((CaptureType)lhs).checkLowerBound(this); |
| |
| default: |
| return false; |
| } |
| } |
| |
| protected boolean checkTypeArgument(TType rhs) { |
| switch(rhs.getKind()) { |
| case ARRAY_TYPE: |
| case STANDARD_TYPE: |
| case PARAMETERIZED_TYPE: |
| return rhs.canAssignTo(getBound()); |
| case RAW_TYPE: |
| // unchecked conversion not allowed here; fix for https://bugs.eclipse.org/bugs/show_bug.cgi?id=127583 |
| return ! getBound().isParameterizedType() && rhs.canAssignTo(getBound()); |
| |
| case UNBOUND_WILDCARD_TYPE: |
| return getBound().isJavaLangObject(); |
| case EXTENDS_WILDCARD_TYPE: |
| return ((ExtendsWildcardType)rhs).getBound().canAssignTo(getBound()); |
| case SUPER_WILDCARD_TYPE: |
| return getBound().isJavaLangObject(); |
| |
| case TYPE_VARIABLE: |
| return rhs.canAssignTo(getBound()); |
| |
| case CAPTURE_TYPE: |
| return checkTypeArgument(((CaptureType)rhs).getWildcard()); |
| |
| default: |
| return false; |
| } |
| } |
| |
| protected boolean checkAssignmentBound(TType rhs) { |
| // ? extends Number is a set of all subtyes of number and number. |
| // so the only thing that can be assigned is null since null is |
| // a sub type of everything |
| return rhs.isNullType(); |
| } |
| |
| public String getName() { |
| return internalGetName("extends"); //$NON-NLS-1$ |
| } |
| |
| protected String getPlainPrettySignature() { |
| return internalGetPrettySignature("extends"); //$NON-NLS-1$ |
| } |
| } |