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SimplifyMediaTypeParseCalls.java
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SimplifyMediaTypeParseCalls.java
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/*
* Copyright 2023 the original author or authors.
* <p>
* 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
* <p>
* https://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.spring.http;
import org.openrewrite.ExecutionContext;
import org.openrewrite.Preconditions;
import org.openrewrite.Recipe;
import org.openrewrite.TreeVisitor;
import org.openrewrite.java.JavaVisitor;
import org.openrewrite.java.MethodMatcher;
import org.openrewrite.java.search.UsesMethod;
import org.openrewrite.java.tree.Expression;
import org.openrewrite.java.tree.J;
import org.openrewrite.java.tree.JavaType;
import org.openrewrite.java.tree.TypeUtils;
import java.util.Optional;
public class SimplifyMediaTypeParseCalls extends Recipe {
@Override
public String getDisplayName() {
return "Simplify unnecessary `MediaType.parseMediaType()` and `MediaType.valueOf()` calls";
}
@Override
public String getDescription() {
return "Replaces `MediaType.parseMediaType(\"application/json\")` and `MediaType.valueOf(\"application/json\")` with `MediaType.APPLICATION_JSON`.";
}
static final String MEDIA_TYPE = "org.springframework.http.MediaType";
static final String PARSE_MEDIA_TYPE = MEDIA_TYPE + " parseMediaType(String)";
static final String VALUE_OF = MEDIA_TYPE + " valueOf(String)";
@Override
public TreeVisitor<?, ExecutionContext> getVisitor() {
return Preconditions.check(
Preconditions.or(new UsesMethod<>(PARSE_MEDIA_TYPE), new UsesMethod<>(VALUE_OF)),
new SimplifyParseCallsVisitor());
}
private static final class SimplifyParseCallsVisitor extends JavaVisitor<ExecutionContext> {
@Override
public J visitMethodInvocation(J.MethodInvocation methodInvocation, ExecutionContext ctx) {
J j = super.visitMethodInvocation(methodInvocation, ctx);
J.MethodInvocation mi = (J.MethodInvocation) j;
if (new MethodMatcher(PARSE_MEDIA_TYPE).matches(mi) || new MethodMatcher(VALUE_OF).matches(mi)) {
Expression methodArg = mi.getArguments().get(0);
if (methodArg instanceof J.FieldAccess
&& TypeUtils.isOfClassType(((J.FieldAccess) methodArg).getTarget().getType(), MEDIA_TYPE)) {
maybeRemoveImport(MEDIA_TYPE + ".parseMediaType");
maybeRemoveImport(MEDIA_TYPE + ".valueOf");
J.FieldAccess fieldAccess = (J.FieldAccess) methodArg;
String replacementConstant = fieldAccess.getSimpleName().replace("_VALUE", "");
Optional<JavaType.Variable> first = fieldAccess.getName().getFieldType() != null ?
((JavaType.Class) fieldAccess.getName().getFieldType().getOwner()).getMembers().stream().filter(v -> v.getName().equals(replacementConstant)).findFirst() :
Optional.empty();
return fieldAccess
.withType(JavaType.Primitive.String)
.withName(fieldAccess.getName()
.withSimpleName(replacementConstant)
.withFieldType(first.orElse(null))
)
.withPrefix(mi.getPrefix())
.withMarkers(mi.getMarkers())
.withComments(mi.getComments());
}
}
return j;
}
}
}