org.eclipse.jdt.internal.compiler.lookup.TypeBound Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2013, 2014 GK Software AG 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:
* Stephan Herrmann - initial API and implementation
* IBM Corporation - bug fixes
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import org.eclipse.jdt.core.compiler.CharOperation;
/**
* Implementation of 18.1.3 in JLS8
*/
public class TypeBound extends ReductionResult {
InferenceVariable left;
// this flag contributes to the workaround controlled by InferenceContext18.ARGUMENT_CONSTRAINTS_ARE_SOFT:
boolean isSoft;
// here we accumulate null tagBits from any types that have been related to this type bound during incorporation:
long nullHints;
static TypeBound createBoundOrDependency(InferenceContext18 context, TypeBinding type, InferenceVariable variable) {
// Part of JLS8 sect 18.1.3:
return new TypeBound(variable, context.substitute(type), SUBTYPE, true);
}
/** Create a true type bound or a dependency. */
TypeBound(InferenceVariable inferenceVariable, TypeBinding typeBinding, int relation) {
this.left = inferenceVariable;
this.right = safeType(typeBinding);
this.relation = relation;
}
TypeBound(InferenceVariable inferenceVariable, TypeBinding typeBinding, int relation, boolean isSoft) {
this.left = inferenceVariable;
this.right = safeType(typeBinding);
this.relation = relation;
this.isSoft = isSoft;
}
private TypeBinding safeType(TypeBinding type) {
if (type != null && type.isLocalType()) {
MethodBinding enclosingMethod = ((LocalTypeBinding) type).enclosingMethod;
if (enclosingMethod != null && CharOperation.prefixEquals(TypeConstants.ANONYMOUS_METHOD, enclosingMethod.selector))
return type.superclass(); // don't use local class inside lambda: lambda is copied, type will be re-created and thus is unmatchable
}
return type;
}
/** distinguish bounds from dependencies. */
boolean isBound() {
return this.right.isProperType(true);
}
public int hashCode() {
return this.left.hashCode() + this.right.hashCode() + this.relation;
}
public boolean equals(Object obj) {
if (obj instanceof TypeBound) {
TypeBound other = (TypeBound) obj;
return this.left == other.left && TypeBinding.equalsEquals(this.right, other.right) && this.relation == other.relation; //$IDENTITY-COMPARISON$ InferenceVariable
}
return false;
}
// debugging:
public String toString() {
boolean isBound = this.right.isProperType(true);
StringBuffer buf = new StringBuffer();
buf.append(isBound ? "TypeBound " : "Dependency "); //$NON-NLS-1$ //$NON-NLS-2$
buf.append(this.left.sourceName);
buf.append(relationToString(this.relation));
buf.append(this.right.readableName());
return buf.toString();
}
}