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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.android.tools.lint.checks;
import static com.android.SdkConstants.CLASS_ATTRIBUTE_SET;
import static com.android.SdkConstants.CLASS_CONTEXT;
import com.android.SdkConstants;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.tools.lint.client.api.JavaEvaluator;
import com.android.tools.lint.detector.api.Category;
import com.android.tools.lint.detector.api.Detector;
import com.android.tools.lint.detector.api.Detector.JavaPsiScanner;
import com.android.tools.lint.detector.api.Implementation;
import com.android.tools.lint.detector.api.Issue;
import com.android.tools.lint.detector.api.JavaContext;
import com.android.tools.lint.detector.api.Location;
import com.android.tools.lint.detector.api.Scope;
import com.android.tools.lint.detector.api.Severity;
import com.intellij.psi.PsiAnonymousClass;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiParameter;
import com.intellij.psi.PsiParameterList;
import com.intellij.psi.PsiType;
import java.util.Collections;
import java.util.List;
/**
* Looks for custom views that do not define the view constructors needed by UI builders
*/
public class ViewConstructorDetector extends Detector implements JavaPsiScanner {
/** The main issue discovered by this detector */
public static final Issue ISSUE = Issue.create(
"ViewConstructor", //$NON-NLS-1$
"Missing View constructors for XML inflation",
"Some layout tools (such as the Android layout editor) need to " +
"find a constructor with one of the following signatures:\n" +
"* `View(Context context)`\n" +
"* `View(Context context, AttributeSet attrs)`\n" +
"* `View(Context context, AttributeSet attrs, int defStyle)`\n" +
"\n" +
"If your custom view needs to perform initialization which does not apply when " +
"used in a layout editor, you can surround the given code with a check to " +
"see if `View#isInEditMode()` is false, since that method will return `false` " +
"at runtime but true within a user interface editor.",
Category.USABILITY,
3,
Severity.WARNING,
new Implementation(
ViewConstructorDetector.class,
Scope.JAVA_FILE_SCOPE));
/** Constructs a new {@link ViewConstructorDetector} check */
public ViewConstructorDetector() {
}
// ---- Implements JavaScanner ----
private static boolean isXmlConstructor(
@NonNull JavaEvaluator evaluator,
@NonNull PsiMethod method) {
// Accept
// android.content.Context
// android.content.Context,android.util.AttributeSet
// android.content.Context,android.util.AttributeSet,int
PsiParameterList parameterList = method.getParameterList();
int argumentCount = parameterList.getParametersCount();
if (argumentCount == 0 || argumentCount > 3) {
return false;
}
PsiParameter[] parameters = parameterList.getParameters();
if (!evaluator.typeMatches(parameters[0].getType(), CLASS_CONTEXT)) {
return false;
}
if (argumentCount == 1) {
return true;
}
if (!evaluator.typeMatches(parameters[1].getType(), CLASS_ATTRIBUTE_SET)) {
return false;
}
//noinspection SimplifiableIfStatement
if (argumentCount == 2) {
return true;
}
return PsiType.INT.equals(parameters[2].getType());
}
@Nullable
@Override
public List applicableSuperClasses() {
return Collections.singletonList(SdkConstants.CLASS_VIEW);
}
@Override
public void checkClass(@NonNull JavaContext context, @NonNull PsiClass declaration) {
// Only applies to concrete classes
JavaEvaluator evaluator = context.getEvaluator();
if (evaluator.isAbstract(declaration)
|| evaluator.isPrivate(declaration)
|| declaration instanceof PsiAnonymousClass) {
// Ignore abstract, private and anonymous classes
return;
}
if (declaration.getContainingClass() != null &&
!evaluator.isStatic(declaration)) {
// Ignore inner classes that aren't static: we can't create these
// anyway since we'd need the outer instance
return;
}
boolean found = false;
for (PsiMethod constructor : declaration.getConstructors()) {
if (isXmlConstructor(evaluator, constructor)) {
found = true;
break;
}
}
if (!found) {
String message = String.format(
"Custom view `%1$s` is missing constructor used by tools: "
+ "`(Context)` or `(Context,AttributeSet)` "
+ "or `(Context,AttributeSet,int)`",
declaration.getName());
Location location = context.getNameLocation(declaration);
context.report(ISSUE, declaration, location, message /*data*/);
}
}
}
