| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 4 | * |
| 5 | * This file is part of JavaParser. |
| 6 | * |
| 7 | * JavaParser can be used either under the terms of |
| 8 | * a) the GNU Lesser General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * b) the terms of the Apache License |
| 12 | * |
| 13 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 14 | * LICENCE.APACHE. Please refer to those files for details. |
| 15 | * |
| 16 | * JavaParser is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Lesser General Public License for more details. |
| 20 | */ |
| 21 | package com.github.javaparser.ast.stmt; |
| 22 | |
| 23 | import com.github.javaparser.ast.AllFieldsConstructor; |
| 24 | import com.github.javaparser.ast.NodeList; |
| 25 | import com.github.javaparser.ast.expr.Expression; |
| 26 | import com.github.javaparser.ast.expr.NameExpr; |
| 27 | import com.github.javaparser.ast.nodeTypes.SwitchNode; |
| 28 | import com.github.javaparser.ast.observer.ObservableProperty; |
| 29 | import com.github.javaparser.ast.visitor.GenericVisitor; |
| 30 | import com.github.javaparser.ast.visitor.VoidVisitor; |
| 31 | import static com.github.javaparser.utils.Utils.assertNotNull; |
| 32 | import com.github.javaparser.ast.Node; |
| 33 | import com.github.javaparser.ast.visitor.CloneVisitor; |
| 34 | import com.github.javaparser.metamodel.SwitchStmtMetaModel; |
| 35 | import com.github.javaparser.metamodel.JavaParserMetaModel; |
| 36 | import com.github.javaparser.TokenRange; |
| 37 | import java.util.function.Consumer; |
| 38 | import java.util.Optional; |
| 39 | import com.github.javaparser.ast.Generated; |
| 40 | |
| 41 | /** |
| 42 | * <h1>The switch statement</h1> |
| 43 | * |
| 44 | * <h2>Java 1.0-1.4</h2> |
| 45 | * The basic C-like switch statement. |
| 46 | * It can switch only on integers. |
| 47 | * <br>{@code switch(x) { case 5: case 6: a=100; break; case 9: a=33; break; default: throw new IllegalStateException(); };} |
| 48 | * <br>In {@code switch(a) { ... }} the selector is "a", |
| 49 | * and the contents of the { ... } are the entries. |
| 50 | * |
| 51 | * <h2>Java 5-6</h2> |
| 52 | * Switching can now also be done on enum constants. |
| 53 | * |
| 54 | * <h2>Java 7-11</h2> |
| 55 | * Switching can now also be done on strings. |
| 56 | * |
| 57 | * <h2>Java 12</h2> |
| 58 | * In preparation for pattern matching, lots of changes are made: |
| 59 | * <ul> |
| 60 | * <li>multiple labels per case |
| 61 | * <li>a -> syntax that does not fall through. |
| 62 | * <li>break can take any expression (usable in the {@link com.github.javaparser.ast.expr.SwitchExpr}) |
| 63 | * <li>switch can be used as an expression (it becomes a {@link com.github.javaparser.ast.expr.SwitchExpr}) |
| 64 | * </ul> |
| 65 | * {@code switch(x) { case BANANA,PEAR: b=10; break; default: b=5; };} |
| 66 | * <br>{@code switch(x) { case 5,6 -> println("uhuh"); default -> println("nope"); };} |
| 67 | * |
| 68 | * <h2>Java 13</h2> |
| 69 | * The break statement has been reverted to what it was before Java 12, and break-with-value is now the YieldStatement. |
| 70 | * |
| 71 | * @author Julio Vilmar Gesser |
| 72 | * @see SwitchEntry |
| 73 | * @see com.github.javaparser.ast.expr.SwitchExpr |
| 74 | * @see SwitchNode |
| 75 | * @see BreakStmt |
| 76 | * @see YieldStmt |
| 77 | */ |
| 78 | public class SwitchStmt extends Statement implements SwitchNode { |
| 79 | |
| 80 | private Expression selector; |
| 81 | |
| 82 | private NodeList<SwitchEntry> entries; |
| 83 | |
| 84 | public SwitchStmt() { |
| 85 | this(null, new NameExpr(), new NodeList<>()); |
| 86 | } |
| 87 | |
| 88 | @AllFieldsConstructor |
| 89 | public SwitchStmt(final Expression selector, final NodeList<SwitchEntry> entries) { |
| 90 | this(null, selector, entries); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * This constructor is used by the parser and is considered private. |
| 95 | */ |
| 96 | @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator") |
| 97 | public SwitchStmt(TokenRange tokenRange, Expression selector, NodeList<SwitchEntry> entries) { |
| 98 | super(tokenRange); |
| 99 | setSelector(selector); |
| 100 | setEntries(entries); |
| 101 | customInitialization(); |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | @Generated("com.github.javaparser.generator.core.node.AcceptGenerator") |
| 106 | public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) { |
| 107 | return v.visit(this, arg); |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | @Generated("com.github.javaparser.generator.core.node.AcceptGenerator") |
| 112 | public <A> void accept(final VoidVisitor<A> v, final A arg) { |
| 113 | v.visit(this, arg); |
| 114 | } |
| 115 | |
| 116 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 117 | public NodeList<SwitchEntry> getEntries() { |
| 118 | return entries; |
| 119 | } |
| 120 | |
| 121 | public SwitchEntry getEntry(int i) { |
| 122 | return getEntries().get(i); |
| 123 | } |
| 124 | |
| 125 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 126 | public Expression getSelector() { |
| 127 | return selector; |
| 128 | } |
| 129 | |
| 130 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 131 | public SwitchStmt setEntries(final NodeList<SwitchEntry> entries) { |
| 132 | assertNotNull(entries); |
| 133 | if (entries == this.entries) { |
| 134 | return (SwitchStmt) this; |
| 135 | } |
| 136 | notifyPropertyChange(ObservableProperty.ENTRIES, this.entries, entries); |
| 137 | if (this.entries != null) |
| 138 | this.entries.setParentNode(null); |
| 139 | this.entries = entries; |
| 140 | setAsParentNodeOf(entries); |
| 141 | return this; |
| 142 | } |
| 143 | |
| 144 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 145 | public SwitchStmt setSelector(final Expression selector) { |
| 146 | assertNotNull(selector); |
| 147 | if (selector == this.selector) { |
| 148 | return (SwitchStmt) this; |
| 149 | } |
| 150 | notifyPropertyChange(ObservableProperty.SELECTOR, this.selector, selector); |
| 151 | if (this.selector != null) |
| 152 | this.selector.setParentNode(null); |
| 153 | this.selector = selector; |
| 154 | setAsParentNodeOf(selector); |
| 155 | return this; |
| 156 | } |
| 157 | |
| 158 | @Override |
| 159 | @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator") |
| 160 | public boolean remove(Node node) { |
| 161 | if (node == null) |
| 162 | return false; |
| 163 | for (int i = 0; i < entries.size(); i++) { |
| 164 | if (entries.get(i) == node) { |
| 165 | entries.remove(i); |
| 166 | return true; |
| 167 | } |
| 168 | } |
| 169 | return super.remove(node); |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | @Generated("com.github.javaparser.generator.core.node.CloneGenerator") |
| 174 | public SwitchStmt clone() { |
| 175 | return (SwitchStmt) accept(new CloneVisitor(), null); |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator") |
| 180 | public SwitchStmtMetaModel getMetaModel() { |
| 181 | return JavaParserMetaModel.switchStmtMetaModel; |
| 182 | } |
| 183 | |
| 184 | @Override |
| 185 | @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator") |
| 186 | public boolean replace(Node node, Node replacementNode) { |
| 187 | if (node == null) |
| 188 | return false; |
| 189 | for (int i = 0; i < entries.size(); i++) { |
| 190 | if (entries.get(i) == node) { |
| 191 | entries.set(i, (SwitchEntry) replacementNode); |
| 192 | return true; |
| 193 | } |
| 194 | } |
| 195 | if (node == selector) { |
| 196 | setSelector((Expression) replacementNode); |
| 197 | return true; |
| 198 | } |
| 199 | return super.replace(node, replacementNode); |
| 200 | } |
| 201 | |
| 202 | @Override |
| 203 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 204 | public boolean isSwitchStmt() { |
| 205 | return true; |
| 206 | } |
| 207 | |
| 208 | @Override |
| 209 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 210 | public SwitchStmt asSwitchStmt() { |
| 211 | return this; |
| 212 | } |
| 213 | |
| 214 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 215 | public void ifSwitchStmt(Consumer<SwitchStmt> action) { |
| 216 | action.accept(this); |
| 217 | } |
| 218 | |
| 219 | @Override |
| 220 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 221 | public Optional<SwitchStmt> toSwitchStmt() { |
| 222 | return Optional.of(this); |
| 223 | } |
| 224 | } |
| 225 |
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