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/*
* Copyright 2015 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.collectionincompatibletype;
import static com.google.errorprone.matchers.method.MethodMatchers.instanceMethod;
import static com.google.errorprone.util.ASTHelpers.getType;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.google.errorprone.VisitorState;
import com.google.errorprone.fixes.Fix;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.util.ASTHelpers;
import com.google.errorprone.util.Signatures;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MemberReferenceTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.tools.javac.code.Type;
import java.util.Collection;
import java.util.Optional;
import javax.annotation.Nullable;
/**
* Matches an instance method like {@link Collection#removeAll}, for which we need to extract the
* type argument to the method argument.
*/
class TypeArgOfMethodArgMatcher extends AbstractCollectionIncompatibleTypeMatcher {
private final Matcher methodMatcher;
private final String receiverTypeName;
private final int receiverTypeArgIndex;
private final int methodArgIndex;
private final String methodArgTypeName;
private final int methodArgTypeArgIndex;
/**
* @param receiverTypeName The fully-qualified name of the type of the method receiver whose
* descendants to match on
* @param signature The signature of the method to match on
* @param receiverTypeArgIndex The index of the type argument that should match the method
* argument
* @param methodArgIndex The index of the method argument whose type argument we should extract
* @param methodArgTypeName The fully-qualified name of the type of the method argument whose type
* argument we should extract
* @param methodArgTypeArgIndex The index of the type argument to extract from the method argument
*/
public TypeArgOfMethodArgMatcher(
String receiverTypeName,
String signature,
int receiverTypeArgIndex,
int methodArgIndex,
String methodArgTypeName,
int methodArgTypeArgIndex) {
this.methodMatcher = instanceMethod().onDescendantOf(receiverTypeName).withSignature(signature);
this.receiverTypeName = receiverTypeName;
this.receiverTypeArgIndex = receiverTypeArgIndex;
this.methodArgIndex = methodArgIndex;
this.methodArgTypeName = methodArgTypeName;
this.methodArgTypeArgIndex = methodArgTypeArgIndex;
}
@Override
Matcher methodMatcher() {
return methodMatcher;
}
@Override
ExpressionTree extractSourceTree(MethodInvocationTree tree, VisitorState state) {
return Iterables.get(tree.getArguments(), methodArgIndex);
}
@Nullable
@Override
ExpressionTree extractSourceTree(MemberReferenceTree tree, VisitorState state) {
return tree;
}
@Override
Type extractSourceType(MethodInvocationTree tree, VisitorState state) {
return extractTypeArgAsMemberOfSupertype(
getType(Iterables.get(tree.getArguments(), methodArgIndex)),
state.getSymbolFromString(methodArgTypeName),
methodArgTypeArgIndex,
state.getTypes());
}
@Nullable
@Override
Type extractSourceType(MemberReferenceTree tree, VisitorState state) {
return extractTypeArgAsMemberOfSupertype(
getType(tree).allparams().get(methodArgIndex),
state.getSymbolFromString(methodArgTypeName),
methodArgTypeArgIndex,
state.getTypes());
}
@Override
Type extractTargetType(MethodInvocationTree tree, VisitorState state) {
return extractTypeArgAsMemberOfSupertype(
ASTHelpers.getReceiverType(tree),
state.getSymbolFromString(receiverTypeName),
receiverTypeArgIndex,
state.getTypes());
}
@Nullable
@Override
Type extractTargetType(MemberReferenceTree tree, VisitorState state) {
return extractTypeArgAsMemberOfSupertype(
ASTHelpers.getReceiverType(tree),
state.getSymbolFromString(receiverTypeName),
receiverTypeArgIndex,
state.getTypes());
}
String getMethodArgTypeName() {
return methodArgTypeName;
}
@Override
Optional buildFix(MatchResult result) {
String fullyQualifiedType = getMethodArgTypeName();
String simpleType = Iterables.getLast(Splitter.on('.').split(fullyQualifiedType));
return Optional.of(
SuggestedFix.builder()
.prefixWith(result.sourceTree(), String.format("(%s) ", simpleType))
.addImport(fullyQualifiedType)
.build());
}
@Override
public String message(MatchResult result, String sourceType, String targetType) {
String sourceTreeType = Signatures.prettyType(getType(result.sourceTree()));
return String.format(
"Argument '%s' should not be passed to this method; its type %s has a type argument "
+ "%s that is not compatible with its collection's type argument %s",
result.sourceTree(), sourceTreeType, sourceType, targetType);
}
}