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/*
* Copyright 2007-2008 Dave Griffith
*
* 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 org.jetbrains.plugins.groovy.codeInspection.validity;
import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspection;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor;
import org.jetbrains.plugins.groovy.codeInspection.utils.EquivalenceChecker;
import org.jetbrains.plugins.groovy.lang.psi.GroovyRecursiveElementVisitor;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrSwitchStatement;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.clauses.GrCaseLabel;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import java.util.HashSet;
import java.util.Set;
public class GroovyDuplicateSwitchBranchInspection extends BaseInspection {
@Override
public boolean isEnabledByDefault() {
return true;
}
@Override
@Nls
@NotNull
public String getGroupDisplayName() {
return VALIDITY_ISSUES;
}
@Override
@Nls
@NotNull
public String getDisplayName() {
return "Duplicate switch case";
}
@Override
@Nullable
protected String buildErrorString(Object... args) {
return "Duplicate switch case '#ref' #loc";
}
@NotNull
@Override
public BaseInspectionVisitor buildVisitor() {
return new Visitor();
}
private static class Visitor extends BaseInspectionVisitor {
@Override
public void visitSwitchStatement(GrSwitchStatement grSwitchStatement) {
super.visitSwitchStatement(grSwitchStatement);
final Set<GrExpression> duplicateExpressions = new HashSet<GrExpression>();
final GrCaseLabel[] labels = collectCaseLabels(grSwitchStatement);
for (int i = 0; i < labels.length; i++) {
final GrCaseLabel label1 = labels[i];
final GrExpression expression1 = getExpressionForCaseLabel(label1);
for (int j = i + 1; j < labels.length; j++) {
final GrCaseLabel label2 = labels[j];
final GrExpression expression2 = getExpressionForCaseLabel(label2);
if (EquivalenceChecker.expressionsAreEquivalent(expression1, expression2)) {
duplicateExpressions.add(expression1);
duplicateExpressions.add(expression2);
}
}
}
for (GrExpression duplicateExpression : duplicateExpressions) {
registerError(duplicateExpression);
}
}
}
private static GrCaseLabel[] collectCaseLabels(final GrSwitchStatement containingStatelent) {
final Set<GrCaseLabel> labels = new HashSet<GrCaseLabel>();
final GroovyRecursiveElementVisitor visitor = new GroovyRecursiveElementVisitor() {
@Override
public void visitCaseLabel(GrCaseLabel grCaseLabel) {
super.visitCaseLabel(grCaseLabel);
labels.add(grCaseLabel);
}
@Override
public void visitSwitchStatement(GrSwitchStatement grSwitchStatement) {
if (containingStatelent.equals(grSwitchStatement)) {
super.visitSwitchStatement(grSwitchStatement);
}
}
};
containingStatelent.accept(visitor);
return labels.toArray(new GrCaseLabel[labels.size()]);
}
@Nullable
private static GrExpression getExpressionForCaseLabel(GrCaseLabel label) {
for (PsiElement child : label.getChildren()) {
if (child instanceof GrExpression) {
return (GrExpression) child;
}
}
return null;
}
}
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