org.openrewrite.java.ChangeFieldType 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;

import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Tags;
import org.openrewrite.Validated;
import org.openrewrite.java.tree.J;
import org.openrewrite.java.tree.JavaType;
import org.openrewrite.java.tree.TypeUtils;

import static java.util.stream.Collectors.toList;
import static org.openrewrite.Validated.required;

public class ChangeFieldType extends JavaIsoRefactorVisitor {
    private JavaType.Class type;
    private String targetType;

    public void setType(String type) {
        this.type = JavaType.Class.build(type);
    }

    public void setTargetType(String targetType) {
        this.targetType = targetType;
    }

    @Override
    public Iterable getTags() {
        return Tags.of("type", type.getFullyQualifiedName(), "target.type", targetType);
    }

    @Override
    public Validated validate() {
        return required("type", type)
                .and(required("targetType", targetType));
    }

    @Override
    public J.VariableDecls visitMultiVariable(J.VariableDecls multiVariable) {
        if (multiVariable.getTypeAsClass().equals(type)) {
            andThen(new Scoped(multiVariable, targetType));
        }
        return super.visitMultiVariable(multiVariable);
    }

    public static class Scoped extends JavaIsoRefactorVisitor {
        private final J.VariableDecls scope;
        private final String targetType;

        public Scoped(J.VariableDecls scope, String targetType) {
            this.scope = scope;
            this.targetType = targetType;
        }

        @Override
        public Iterable getTags() {
            return Tags.of("to", targetType);
        }

        @Override
        public J.VariableDecls visitMultiVariable(J.VariableDecls multiVariable) {
            JavaType.Class originalType = multiVariable.getTypeAsClass();
            J.VariableDecls mv = super.visitMultiVariable(multiVariable);
            if (scope.isScope(multiVariable) && originalType != null && !originalType.getFullyQualifiedName().equals(targetType)) {
                JavaType.Class type = JavaType.Class.build(targetType);

                maybeAddImport(targetType);
                maybeRemoveImport(originalType);

                mv = mv.withTypeExpr(mv.getTypeExpr() == null ? null : J.Ident.build(mv.getTypeExpr().getId(),
                        type.getClassName(), type, mv.getTypeExpr().getFormatting()))
                        .withVars(mv.getVars().stream().map(var -> {
                            JavaType.Class varType = TypeUtils.asClass(var.getType());
                            if (varType != null && !varType.equals(type)) {
                                return var.withType(type).withName(var.getName().withType(type));
                            }
                            return var;
                        }).collect(toList()));
            }
            return mv;
        }
    }
}