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package com.github.javaparser.ast.validator.chunks;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.body.InitializerDeclaration;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.validator.SimpleValidator;
import com.github.javaparser.ast.validator.SingleNodeTypeValidator;
import com.github.javaparser.ast.validator.TreeVisitorValidator;
import com.github.javaparser.ast.validator.Validators;
import com.github.javaparser.metamodel.NodeMetaModel;
import com.github.javaparser.metamodel.PropertyMetaModel;
import java.util.Optional;
/**
* Contains validations that are valid for every Java version.
*/
public class CommonValidators extends Validators {
public CommonValidators() {
super(
new SimpleValidator<>(ClassOrInterfaceDeclaration.class,
n -> !n.isInterface() && n.getExtendedTypes().size() > 1,
(n, reporter) -> reporter.report(n.getExtendedTypes(1), "A class cannot extend more than one other class.")
),
new SimpleValidator<>(ClassOrInterfaceDeclaration.class,
n -> n.isInterface() && !n.getImplementedTypes().isEmpty(),
(n, reporter) -> reporter.report(n.getImplementedTypes(0), "An interface cannot implement other interfaces.")
),
new SingleNodeTypeValidator<>(ClassOrInterfaceDeclaration.class, (n, reporter) -> {
if (n.isInterface()) {
n.getMembers().forEach(mem -> {
if (mem instanceof InitializerDeclaration) {
reporter.report(mem, "An interface cannot have initializers.");
}
});
}
}
),
new SingleNodeTypeValidator<>(AssignExpr.class, (n, reporter) -> {
// https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.26
Expression target = n.getTarget();
while (target instanceof EnclosedExpr) {
target = ((EnclosedExpr) target).getInner();
}
if (target instanceof NameExpr
|| target instanceof ArrayAccessExpr
|| target instanceof FieldAccessExpr) {
return;
}
reporter.report(n.getTarget(), "Illegal left hand side of an assignment.");
}
),
new TreeVisitorValidator((node, problemReporter) -> {
NodeMetaModel mm = node.getMetaModel();
for (PropertyMetaModel ppm : mm.getAllPropertyMetaModels()) {
if (ppm.isNonEmpty()) {
if (ppm.isNodeList()) {
NodeList value = (NodeList) ppm.getValue(node);
if (value.isEmpty()) {
problemReporter.report(node, "%s.%s can not be empty.", mm.getTypeName(), ppm.getName());
}
}
// No need to check empty strings, it should be impossible to set them to ""
}
}
})
);
}
}
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