package org.stjs.generator.plugin.java8.check.expression;
import javax.lang.model.element.Element;
import org.stjs.generator.GenerationContext;
import org.stjs.generator.GeneratorConstants;
import org.stjs.generator.check.CheckContributor;
import org.stjs.generator.check.CheckVisitor;
import org.stjs.generator.javac.TreeUtils;
import org.stjs.generator.utils.JavaNodes;
import org.stjs.generator.writer.expression.MethodInvocationWriter;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.LambdaExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.util.TreePath;
public class MethodAccessFromLambdaCheck implements CheckContributor<MethodInvocationTree> {
@Override
public Void visit(CheckVisitor visitor, MethodInvocationTree tree, GenerationContext<Void> context) {
Element methodElement = TreeUtils.elementFromUse(tree);
if (JavaNodes.isStatic(methodElement)) {
// only instance methods
return null;
}
String name = MethodInvocationWriter.buildMethodName(tree);
if (GeneratorConstants.THIS.equals(name) || GeneratorConstants.SUPER.equals(name)) {
// this and super call are ok
return null;
}
if (!(tree.getMethodSelect() instanceof IdentifierTree)) {
// check for Outer.this check
return null;
}
TreePath enclosingLambdaPath = TreeUtils.enclosingPathOfType(context.getCurrentPath(), LambdaExpressionTree.class);
if (enclosingLambdaPath != null) {
context.addError(tree, "In Javascript you cannot access a method from the outer type. "
+ "You should define a variable var that=this outside your lamda expression and use the method of this object. The method: "
+ tree);
}
return null;
}
}