org.openrewrite.java.search.FindReferencesToVariable Maven / Gradle / Ivy
/*
* Copyright 2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.openrewrite.java.search;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Tags;
import org.openrewrite.Tree;
import org.openrewrite.java.AbstractJavaSourceVisitor;
import org.openrewrite.java.tree.J;
import java.util.List;
import static java.util.Collections.emptyList;
import static java.util.Collections.singletonList;
public class FindReferencesToVariable extends AbstractJavaSourceVisitor> {
private final J.Ident variable;
public FindReferencesToVariable(J.Ident variable) {
this.variable = variable;
}
@Override
public Iterable getTags() {
return Tags.of("variable", variable.getSimpleName());
}
@Override
public List defaultTo(Tree t) {
return emptyList();
}
@Override
public List visitAssign(J.Assign assign) {
return hasReference(assign.getVariable()) ? singletonList(assign) : super.visitAssign(assign);
}
@Override
public List visitAssignOp(J.AssignOp assignOp) {
return hasReference(assignOp.getVariable()) ? singletonList(assignOp) : super.visitAssignOp(assignOp);
}
@Override
public List visitUnary(J.Unary unary) {
return hasReference(unary.getExpr()) ? singletonList(unary) : super.visitUnary(unary);
}
private boolean hasReference(Tree t) {
return new HasReferenceToVariableInSubtree().visit(t);
}
private class HasReferenceToVariableInSubtree extends AbstractJavaSourceVisitor {
@Override
public Boolean defaultTo(Tree t) {
return false;
}
@Override
public Boolean visitIdentifier(J.Ident ident) {
return ident.getIdent() == variable.getIdent() || super.visitIdentifier(ident);
}
}
}