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/*
* Copyright 2016 Federico Tomassetti
*
* 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 com.github.javaparser.symbolsolver.model.typesystem;
import com.github.javaparser.symbolsolver.model.declarations.TypeParameterDeclaration;
import java.util.Map;
/**
* A wildcard can be:
* - unbounded (?)
* - have a lower bound (? super Number)
* - have an upper bound (? extends Number)
* It is not possible to have both a lower and an upper bound at the same time.
*
* @author Federico Tomassetti
*/
public class Wildcard implements Type {
public static Wildcard UNBOUNDED = new Wildcard(null, null);
private BoundType type;
private Type boundedType;
private Wildcard(BoundType type, Type boundedType) {
if (type == null && boundedType != null) {
throw new IllegalArgumentException();
}
if (type != null && boundedType == null) {
throw new IllegalArgumentException();
}
this.type = type;
this.boundedType = boundedType;
}
public static Wildcard superBound(Type type) {
return new Wildcard(BoundType.SUPER, type);
}
public static Wildcard extendsBound(Type type) {
return new Wildcard(BoundType.EXTENDS, type);
}
@Override
public String toString() {
return "WildcardUsage{" +
"type=" + type +
", boundedType=" + boundedType +
'}';
}
public boolean isWildcard() {
return true;
}
public Wildcard asWildcard() {
return this;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Wildcard)) return false;
Wildcard that = (Wildcard) o;
if (boundedType != null ? !boundedType.equals(that.boundedType) : that.boundedType != null) return false;
if (type != that.type) return false;
return true;
}
@Override
public int hashCode() {
int result = type != null ? type.hashCode() : 0;
result = 31 * result + (boundedType != null ? boundedType.hashCode() : 0);
return result;
}
@Override
public String describe() {
if (type == null) {
return "?";
} else if (type == BoundType.SUPER) {
return "? super " + boundedType.describe();
} else if (type == BoundType.EXTENDS) {
return "? extends " + boundedType.describe();
} else {
throw new UnsupportedOperationException();
}
}
public boolean isSuper() {
return type == BoundType.SUPER;
}
public boolean isExtends() {
return type == BoundType.EXTENDS;
}
public boolean isBounded() {
return isSuper() || isExtends();
}
public Type getBoundedType() {
if (boundedType == null) {
throw new IllegalStateException();
}
return boundedType;
}
@Override
public boolean isAssignableBy(Type other) {
if (boundedType == null) {
//return other.isReferenceType() && other.asReferenceType().getQualifiedName().equals(Object.class.getCanonicalName());
return false;
} else if (type == BoundType.SUPER) {
return boundedType.isAssignableBy(other);
} else if (type == BoundType.EXTENDS) {
return false;
} else {
throw new RuntimeException();
}
}
@Override
public Type replaceTypeVariables(TypeParameterDeclaration tpToReplace, Type replaced, Map<TypeParameterDeclaration, Type> inferredTypes) {
if (replaced == null) {
throw new IllegalArgumentException();
}
if (boundedType == null) {
return this;
}
Type boundedTypeReplaced = boundedType.replaceTypeVariables(tpToReplace, replaced, inferredTypes);
if (boundedTypeReplaced == null) {
throw new RuntimeException();
}
if (boundedTypeReplaced != boundedType) {
return new Wildcard(type, boundedTypeReplaced);
} else {
return this;
}
}
public enum BoundType {
SUPER,
EXTENDS
}
}
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