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| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | + * or more contributor license agreements. See the NOTICE file |
| 4 | + * distributed with this work for additional information |
| 5 | + * regarding copyright ownership. The ASF licenses this file |
| 6 | + * to you under the Apache License, Version 2.0 (the |
| 7 | + * "License"); you may not use this file except in compliance |
| 8 | + * with the License. You may obtain a copy of the License at |
| 9 | + * |
| 10 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | + * |
| 12 | + * Unless required by applicable law or agreed to in writing, |
| 13 | + * software distributed under the License is distributed on an |
| 14 | + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | + * KIND, either express or implied. See the License for the |
| 16 | + * specific language governing permissions and limitations |
| 17 | + * under the License. |
| 18 | + */ |
| 19 | +package org.netbeans.modules.java.hints.errors; |
| 20 | + |
| 21 | +import com.sun.source.tree.BreakTree; |
| 22 | +import com.sun.source.tree.CaseTree; |
| 23 | +import com.sun.source.tree.CaseTree.CaseKind; |
| 24 | +import com.sun.source.tree.ExpressionTree; |
| 25 | +import com.sun.source.tree.ParenthesizedTree; |
| 26 | +import com.sun.source.tree.StatementTree; |
| 27 | +import com.sun.source.tree.SwitchExpressionTree; |
| 28 | +import com.sun.source.tree.SwitchTree; |
| 29 | +import com.sun.source.tree.Tree; |
| 30 | +import com.sun.source.util.SourcePositions; |
| 31 | +import com.sun.source.util.TreePath; |
| 32 | +import java.util.ArrayList; |
| 33 | +import java.util.List; |
| 34 | +import java.util.Set; |
| 35 | +import org.netbeans.api.java.source.CompilationInfo; |
| 36 | +import org.netbeans.api.java.source.TreeMaker; |
| 37 | +import org.netbeans.api.java.source.WorkingCopy; |
| 38 | +import org.netbeans.modules.java.hints.spi.ErrorRule; |
| 39 | +import org.netbeans.spi.editor.hints.Fix; |
| 40 | +import org.netbeans.spi.java.hints.JavaFix; |
| 41 | +import org.openide.util.NbBundle; |
| 42 | + |
| 43 | +/** |
| 44 | + * Resolves javac error by adding a missing default case to a switch. |
| 45 | + * |
| 46 | + * @author SANDEEMI |
| 47 | + */ |
| 48 | +@NbBundle.Messages("FIX_Add_Default_Case=Add Default Case") |
| 49 | +public class AddDefaultCase implements ErrorRule<Void> { |
| 50 | + |
| 51 | + private static final Set<String> CODES = Set.of( |
| 52 | + "compiler.err.not.exhaustive", |
| 53 | + "compiler.err.not.exhaustive.statement" |
| 54 | + ); |
| 55 | + |
| 56 | + private static final String THROW_ISE = "throw new IllegalStateException(\"Unexpected value: \" + %1$s);"; |
| 57 | + |
| 58 | + @Override |
| 59 | + public Set<String> getCodes() { |
| 60 | + return CODES; |
| 61 | + } |
| 62 | + |
| 63 | + @Override |
| 64 | + public List<Fix> run(CompilationInfo info, String diagnosticKey, int offset, TreePath treePath, Data<Void> data) { |
| 65 | + return List.of(new AddDefaultCaseFix(info, treePath).toEditorFix()); |
| 66 | + } |
| 67 | + |
| 68 | + @Override |
| 69 | + public String getId() { |
| 70 | + return AddDefaultCase.class.getName(); |
| 71 | + } |
| 72 | + |
| 73 | + @Override |
| 74 | + public String getDisplayName() { |
| 75 | + return Bundle.FIX_Add_Default_Case(); |
| 76 | + } |
| 77 | + |
| 78 | + @Override |
| 79 | + public void cancel() { |
| 80 | + |
| 81 | + } |
| 82 | + |
| 83 | + private static final class AddDefaultCaseFix extends JavaFix { |
| 84 | + |
| 85 | + public AddDefaultCaseFix(CompilationInfo info, TreePath path) { |
| 86 | + super(info, path); |
| 87 | + } |
| 88 | + |
| 89 | + @Override |
| 90 | + protected String getText() { |
| 91 | + return Bundle.FIX_Add_Default_Case(); |
| 92 | + } |
| 93 | + |
| 94 | + @Override |
| 95 | + protected void performRewrite(TransformationContext ctx) throws Exception { |
| 96 | + WorkingCopy wc = ctx.getWorkingCopy(); |
| 97 | + TreeMaker make = wc.getTreeMaker(); |
| 98 | + TreePath path = ctx.getPath(); |
| 99 | + |
| 100 | + switch (path.getLeaf().getKind()) { |
| 101 | + case SWITCH_EXPRESSION -> { |
| 102 | + SwitchExpressionTree expTree = (SwitchExpressionTree) path.getLeaf(); |
| 103 | + List<? extends CaseTree> cases = expTree.getCases(); |
| 104 | + if (cases.isEmpty()) { |
| 105 | + return; |
| 106 | + } |
| 107 | + ParenthesizedTree expression = (ParenthesizedTree) expTree.getExpression(); |
| 108 | + |
| 109 | + String text = THROW_ISE.formatted(expression.toString()); |
| 110 | + StatementTree parseStatement = wc.getTreeUtilities().parseStatement(text, new SourcePositions[1]); |
| 111 | + CaseTree caseSwitchPatterns; |
| 112 | + if (cases.get(0).getCaseKind() == CaseKind.RULE) { |
| 113 | + caseSwitchPatterns = make.CasePatterns(List.of(), parseStatement); |
| 114 | + } else { |
| 115 | + caseSwitchPatterns = make.CasePatterns(List.of(), List.of(parseStatement)); |
| 116 | + } |
| 117 | + |
| 118 | + List<CaseTree> newCases = new ArrayList<>(cases.size() + 1); |
| 119 | + newCases.addAll(cases); |
| 120 | + newCases.add(caseSwitchPatterns); |
| 121 | + Tree switchExpression = make.SwitchExpression(expression, newCases); |
| 122 | + wc.rewrite(expTree, switchExpression); |
| 123 | + } |
| 124 | + case SWITCH -> { |
| 125 | + SwitchTree switchTree = (SwitchTree) path.getLeaf(); |
| 126 | + List<? extends CaseTree> cases = switchTree.getCases(); |
| 127 | + if (cases.isEmpty()) { |
| 128 | + return; |
| 129 | + } |
| 130 | + ExpressionTree expression = ((ParenthesizedTree) switchTree.getExpression()).getExpression(); |
| 131 | + |
| 132 | + String text = THROW_ISE.formatted(expression.toString()); |
| 133 | + StatementTree parseStatement = wc.getTreeUtilities().parseStatement(text, new SourcePositions[1]); |
| 134 | + CaseTree caseSwitchPatterns; |
| 135 | + if (cases.get(0).getCaseKind() == CaseKind.RULE) { |
| 136 | + caseSwitchPatterns = make.CasePatterns(List.of(), parseStatement); |
| 137 | + } else { |
| 138 | + handleLastCase(cases.get(cases.size() - 1), wc, make); |
| 139 | + caseSwitchPatterns = make.CasePatterns(List.of(), List.of(parseStatement)); |
| 140 | + } |
| 141 | + |
| 142 | + SwitchTree insertSwitchCase = make.addSwitchCase(switchTree, caseSwitchPatterns); |
| 143 | + wc.rewrite(switchTree, insertSwitchCase); |
| 144 | + } |
| 145 | + default -> throw new UnsupportedOperationException(path.getLeaf().getKind() + " not implemented"); |
| 146 | + } |
| 147 | + } |
| 148 | + |
| 149 | + private static void handleLastCase(CaseTree lastCase, WorkingCopy wc, TreeMaker make) { |
| 150 | + List<? extends StatementTree> statements = lastCase.getStatements(); |
| 151 | + if (statements.isEmpty() || !(statements.get(statements.size() - 1) instanceof BreakTree)) { |
| 152 | + List<StatementTree> expanded = new ArrayList<>(statements.size() + 1); |
| 153 | + expanded.addAll(statements); |
| 154 | + expanded.add(make.Break(null)); |
| 155 | + wc.rewrite(lastCase, make.CasePatterns(lastCase.getLabels(), expanded)); |
| 156 | + } |
| 157 | + } |
| 158 | + } |
| 159 | +} |
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