org.eclipse.jdt.internal.compiler.ast.QualifiedSuperReference.java Source code

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Here is the source code for org.eclipse.jdt.internal.compiler.ast.QualifiedSuperReference.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Stephan Herrmann - Contribution for
 *                        bug 382350 - [1.8][compiler] Unable to invoke inherited default method via I.super.m() syntax
 *                        bug 404649 - [1.8][compiler] detect illegal reference to indirect or redundant super
 *                        bug 404728 - [1.8]NPE on QualifiedSuperReference error
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReasons;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;

public class QualifiedSuperReference extends QualifiedThisReference {

    public QualifiedSuperReference(TypeReference name, int pos, int sourceEnd) {
        super(name, pos, sourceEnd);
    }

    @Override
    public boolean isSuper() {
        return true;
    }

    @Override
    public boolean isQualifiedSuper() {
        return true;
    }

    @Override
    public boolean isThis() {
        return false;
    }

    @Override
    public StringBuffer printExpression(int indent, StringBuffer output) {
        return this.qualification.print(0, output).append(".super"); //$NON-NLS-1$
    }

    @Override
    public TypeBinding resolveType(BlockScope scope) {
        if ((this.bits & ParenthesizedMASK) != 0) {
            scope.problemReporter().invalidParenthesizedExpression(this);
            return null;
        }
        super.resolveType(scope);
        if (this.resolvedType != null && !this.resolvedType.isValidBinding()) {
            scope.problemReporter().illegalSuperAccess(this.qualification.resolvedType, this.resolvedType, this);
            return null;
        }
        if (this.currentCompatibleType == null)
            return null; // error case

        if (this.currentCompatibleType.id == T_JavaLangObject) {
            scope.problemReporter().cannotUseSuperInJavaLangObject(this);
            return null;
        }
        return this.resolvedType = (this.currentCompatibleType.isInterface() ? this.currentCompatibleType
                : this.currentCompatibleType.superclass());
    }

    @Override
    int findCompatibleEnclosing(ReferenceBinding enclosingType, TypeBinding type, BlockScope scope) {
        if (type.isInterface()) {
            // super call to an overridden default method? (not considering outer enclosings)
            CompilerOptions compilerOptions = scope.compilerOptions();
            ReferenceBinding[] supers = enclosingType.superInterfaces();
            int length = supers.length;
            boolean isJava8 = compilerOptions.complianceLevel >= ClassFileConstants.JDK1_8;
            boolean isLegal = true; // false => compoundName != null && closestMatch != null
            char[][] compoundName = null;
            ReferenceBinding closestMatch = null;
            for (int i = 0; i < length; i++) {
                if (TypeBinding.equalsEquals(supers[i].erasure(), type)) {
                    this.currentCompatibleType = closestMatch = supers[i];
                } else if (supers[i].erasure().isCompatibleWith(type)) {
                    isLegal = false;
                    compoundName = supers[i].compoundName;
                    if (closestMatch == null)
                        closestMatch = supers[i];
                    // keep looking to ensure we always find the referenced type (even if illegal) 
                }
            }
            if (!isLegal || !isJava8) {
                this.currentCompatibleType = null;
                // Please note the slightly unconventional use of the ProblemReferenceBinding:
                // we use the problem's compoundName to report the type being illegally bypassed,
                // whereas the closestMatch denotes the resolved (though illegal) target type
                // for downstream resolving.
                this.resolvedType = new ProblemReferenceBinding(compoundName, closestMatch,
                        isJava8 ? ProblemReasons.AttemptToBypassDirectSuper
                                : ProblemReasons.InterfaceMethodInvocationNotBelow18);
            }
            return 0; // never an outer enclosing type
        }
        return super.findCompatibleEnclosing(enclosingType, type, scope);
    }

    @Override
    public void traverse(ASTVisitor visitor, BlockScope blockScope) {

        if (visitor.visit(this, blockScope)) {
            this.qualification.traverse(visitor, blockScope);
        }
        visitor.endVisit(this, blockScope);
    }

    @Override
    public void traverse(ASTVisitor visitor, ClassScope blockScope) {

        if (visitor.visit(this, blockScope)) {
            this.qualification.traverse(visitor, blockScope);
        }
        visitor.endVisit(this, blockScope);
    }
}