com.google.errorprone.bugpatterns.argumentselectiondefects.Changes Maven / Gradle / Ivy
/*
* Copyright 2017 The Error Prone 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
*
* http://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 com.google.errorprone.bugpatterns.argumentselectiondefects;
import static com.google.errorprone.util.ASTHelpers.getStartPosition;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.fixes.SuggestedFix;
import com.sun.source.tree.ExpressionTree;
import java.util.stream.Collectors;
/**
* Value class for holding suggested changes to method call arguments.
*
* @author [email protected] (Andrew Rice)
*/
@AutoValue
abstract class Changes {
abstract ImmutableList originalCost();
abstract ImmutableList assignmentCost();
abstract ImmutableList changedPairs();
boolean isEmpty() {
return changedPairs().isEmpty();
}
double totalAssignmentCost() {
return assignmentCost().stream().mapToDouble(d -> d).sum();
}
double totalOriginalCost() {
return originalCost().stream().mapToDouble(d -> d).sum();
}
static Changes create(
ImmutableList originalCost,
ImmutableList assignmentCost,
ImmutableList changedPairs) {
return new AutoValue_Changes(originalCost, assignmentCost, changedPairs);
}
static Changes empty() {
return new AutoValue_Changes(ImmutableList.of(), ImmutableList.of(), ImmutableList.of());
}
SuggestedFix buildCommentArgumentsFix(InvocationInfo info) {
SuggestedFix.Builder commentArgumentsFixBuilder = SuggestedFix.builder();
for (ParameterPair change : changedPairs()) {
int index = change.formal().index();
ExpressionTree actual = info.actualParameters().get(index);
int startPosition = getStartPosition(actual);
String formal = info.formalParameters().get(index).getSimpleName().toString();
commentArgumentsFixBuilder.replace(
startPosition, startPosition, NamedParameterComment.toCommentText(formal));
}
return commentArgumentsFixBuilder.build();
}
SuggestedFix buildPermuteArgumentsFix(InvocationInfo info) {
SuggestedFix.Builder permuteArgumentsFixBuilder = SuggestedFix.builder();
for (ParameterPair pair : changedPairs()) {
permuteArgumentsFixBuilder.replace(
info.actualParameters().get(pair.formal().index()),
// use getSourceForNode to avoid javac pretty printing the replacement (pretty printing
// converts unicode characters to unicode escapes)
info.state().getSourceForNode(info.actualParameters().get(pair.actual().index())));
}
return permuteArgumentsFixBuilder.build();
}
public String describe(InvocationInfo info) {
return "The following arguments may have been swapped: "
+ changedPairs().stream()
.map(
p ->
String.format(
"'%s' for formal parameter '%s'",
info.state()
.getSourceForNode(info.actualParameters().get(p.formal().index())),
p.formal().name()))
.collect(Collectors.joining(", "))
+ ". Either add clarifying `/* paramName= */` comments, or swap the arguments if that is"
+ " what was intended";
}
}