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/*
* Copyright (c) 2010, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8235541
* @summary Test that the binding variable kind is appropriately set
* @library /tools/javac/lib
* @modules jdk.compiler
* @build JavacTestingAbstractProcessor
* @compile TestBindingVariable.java
* @compile -processor TestBindingVariable -proc:only TestBindingVariableData.java
*/
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.util.*;
import java.util.*;
import com.sun.source.tree.*;
import com.sun.source.util.*;
/**
* Using the tree API, retrieve element representations of the
* binding variables of the type test pattern, and verify their kind
* tags are set appropriately.
*/
public class TestBindingVariable extends JavacTestingAbstractProcessor implements AutoCloseable {
int bindingVariableCount = 0;
public boolean process(Set<? extends TypeElement> annotations,
RoundEnvironment roundEnv) {
if (!roundEnv.processingOver()) {
Trees trees = Trees.instance(processingEnv);
for(Element rootElement : roundEnv.getRootElements()) {
TreePath treePath = trees.getPath(rootElement);
(new BindingVariableScanner(trees)).
scan(treePath.getCompilationUnit(), null);
}
if (bindingVariableCount != 2)
throw new RuntimeException("Bad binding variable count " +
bindingVariableCount);
}
return true;
}
@Override
public void close() {}
/**
* Verify that a binding variable modeled as an element behaves
* as expected under 6 and latest specific visitors.
*/
private static void testBindingVariable(Element element) {
ElementVisitor visitor6 = new ElementKindVisitor6<Void, Void>() {};
try {
visitor6.visit(element);
throw new RuntimeException("Expected UnknownElementException not thrown.");
} catch (UnknownElementException uee) {
; // Expected.
}
ElementKindVisitor visitorLatest =
new ElementKindVisitor<Object, Void>() {
@Override
public Object visitVariableAsBindingVariable(VariableElement e,
Void p) {
return e; // a non-null value
}
};
if (visitorLatest.visit(element) == null) {
throw new RuntimeException("Null result of resource variable visitation.");
}
}
class BindingVariableScanner extends TreePathScanner<Void, Void> {
private Trees trees;
public BindingVariableScanner(Trees trees) {
super();
this.trees = trees;
}
@Override
public Void visitBindingPattern(BindingPatternTree node, Void p) {
handleTreeAsBindingVar(new TreePath(getCurrentPath(), node.getVariable()));
return super.visitBindingPattern(node, p);
}
@Override
public Void visitIdentifier(IdentifierTree node, Void p) {
if (node.getName().contentEquals("bindingVar")) {
handleTreeAsBindingVar(getCurrentPath());
}
return super.visitIdentifier(node, p);
}
private void handleTreeAsBindingVar(TreePath tp) {
Element element = trees.getElement(tp);
System.out.println("Name: " + element.getSimpleName() +
"\tKind: " + element.getKind());
if (element.getKind() != ElementKind.BINDING_VARIABLE) {
throw new RuntimeException("Expected a binding variable, but got: " +
element.getKind());
}
testBindingVariable(element);
bindingVariableCount++;
}
}
}
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