| 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.expr.BooleanLiteralExpr; |
| 25 | import com.github.javaparser.ast.expr.Expression; |
| 26 | import com.github.javaparser.ast.nodeTypes.NodeWithCondition; |
| 27 | import com.github.javaparser.ast.observer.ObservableProperty; |
| 28 | import com.github.javaparser.ast.visitor.GenericVisitor; |
| 29 | import com.github.javaparser.ast.visitor.VoidVisitor; |
| 30 | import java.util.Optional; |
| 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.DerivedProperty; |
| 35 | import com.github.javaparser.metamodel.IfStmtMetaModel; |
| 36 | import com.github.javaparser.metamodel.JavaParserMetaModel; |
| 37 | import com.github.javaparser.TokenRange; |
| 38 | import com.github.javaparser.metamodel.OptionalProperty; |
| 39 | import java.util.function.Consumer; |
| 40 | import com.github.javaparser.ast.Generated; |
| 41 | |
| 42 | /** |
| 43 | * An if-then-else statement. The else is optional. |
| 44 | * <br>In {@code if(a==5) hurray() else boo();} the condition is a==5, |
| 45 | * hurray() is the thenStmt, and boo() is the elseStmt. |
| 46 | * |
| 47 | * @author Julio Vilmar Gesser |
| 48 | */ |
| 49 | public class IfStmt extends Statement implements NodeWithCondition<IfStmt> { |
| 50 | |
| 51 | private Expression condition; |
| 52 | |
| 53 | private Statement thenStmt; |
| 54 | |
| 55 | @OptionalProperty |
| 56 | private Statement elseStmt; |
| 57 | |
| 58 | public IfStmt() { |
| 59 | this(null, new BooleanLiteralExpr(), new ReturnStmt(), null); |
| 60 | } |
| 61 | |
| 62 | @AllFieldsConstructor |
| 63 | public IfStmt(final Expression condition, final Statement thenStmt, final Statement elseStmt) { |
| 64 | this(null, condition, thenStmt, elseStmt); |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * This constructor is used by the parser and is considered private. |
| 69 | */ |
| 70 | @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator") |
| 71 | public IfStmt(TokenRange tokenRange, Expression condition, Statement thenStmt, Statement elseStmt) { |
| 72 | super(tokenRange); |
| 73 | setCondition(condition); |
| 74 | setThenStmt(thenStmt); |
| 75 | setElseStmt(elseStmt); |
| 76 | customInitialization(); |
| 77 | } |
| 78 | |
| 79 | @Override |
| 80 | @Generated("com.github.javaparser.generator.core.node.AcceptGenerator") |
| 81 | public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) { |
| 82 | return v.visit(this, arg); |
| 83 | } |
| 84 | |
| 85 | @Override |
| 86 | @Generated("com.github.javaparser.generator.core.node.AcceptGenerator") |
| 87 | public <A> void accept(final VoidVisitor<A> v, final A arg) { |
| 88 | v.visit(this, arg); |
| 89 | } |
| 90 | |
| 91 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 92 | public Expression getCondition() { |
| 93 | return condition; |
| 94 | } |
| 95 | |
| 96 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 97 | public Optional<Statement> getElseStmt() { |
| 98 | return Optional.ofNullable(elseStmt); |
| 99 | } |
| 100 | |
| 101 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 102 | public Statement getThenStmt() { |
| 103 | return thenStmt; |
| 104 | } |
| 105 | |
| 106 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 107 | public IfStmt setCondition(final Expression condition) { |
| 108 | assertNotNull(condition); |
| 109 | if (condition == this.condition) { |
| 110 | return (IfStmt) this; |
| 111 | } |
| 112 | notifyPropertyChange(ObservableProperty.CONDITION, this.condition, condition); |
| 113 | if (this.condition != null) |
| 114 | this.condition.setParentNode(null); |
| 115 | this.condition = condition; |
| 116 | setAsParentNodeOf(condition); |
| 117 | return this; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Sets the elseStmt |
| 122 | * |
| 123 | * @param elseStmt the elseStmt, can be null |
| 124 | * @return this, the IfStmt |
| 125 | */ |
| 126 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 127 | public IfStmt setElseStmt(final Statement elseStmt) { |
| 128 | if (elseStmt == this.elseStmt) { |
| 129 | return (IfStmt) this; |
| 130 | } |
| 131 | notifyPropertyChange(ObservableProperty.ELSE_STMT, this.elseStmt, elseStmt); |
| 132 | if (this.elseStmt != null) |
| 133 | this.elseStmt.setParentNode(null); |
| 134 | this.elseStmt = elseStmt; |
| 135 | setAsParentNodeOf(elseStmt); |
| 136 | return this; |
| 137 | } |
| 138 | |
| 139 | @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| 140 | public IfStmt setThenStmt(final Statement thenStmt) { |
| 141 | assertNotNull(thenStmt); |
| 142 | if (thenStmt == this.thenStmt) { |
| 143 | return (IfStmt) this; |
| 144 | } |
| 145 | notifyPropertyChange(ObservableProperty.THEN_STMT, this.thenStmt, thenStmt); |
| 146 | if (this.thenStmt != null) |
| 147 | this.thenStmt.setParentNode(null); |
| 148 | this.thenStmt = thenStmt; |
| 149 | setAsParentNodeOf(thenStmt); |
| 150 | return this; |
| 151 | } |
| 152 | |
| 153 | @Override |
| 154 | @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator") |
| 155 | public boolean remove(Node node) { |
| 156 | if (node == null) |
| 157 | return false; |
| 158 | if (elseStmt != null) { |
| 159 | if (node == elseStmt) { |
| 160 | removeElseStmt(); |
| 161 | return true; |
| 162 | } |
| 163 | } |
| 164 | return super.remove(node); |
| 165 | } |
| 166 | |
| 167 | @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator") |
| 168 | public IfStmt removeElseStmt() { |
| 169 | return setElseStmt((Statement) null); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * This method returns true if the then branch (which should be always present) is a block statement. |
| 174 | */ |
| 175 | @DerivedProperty |
| 176 | public boolean hasThenBlock() { |
| 177 | return thenStmt instanceof BlockStmt; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * This method returns true if the If Statement has an else branch and that branch is a block statement. |
| 182 | */ |
| 183 | @DerivedProperty |
| 184 | public boolean hasElseBlock() { |
| 185 | return elseStmt instanceof BlockStmt; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * This method returns true if the If Statement has an else branch and that branch is another If Statement. |
| 190 | */ |
| 191 | @DerivedProperty |
| 192 | public boolean hasCascadingIfStmt() { |
| 193 | return elseStmt instanceof IfStmt; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * This method returns true if the If Statement has an else branch. |
| 198 | */ |
| 199 | @DerivedProperty |
| 200 | public boolean hasElseBranch() { |
| 201 | return elseStmt != null; |
| 202 | } |
| 203 | |
| 204 | @Override |
| 205 | @Generated("com.github.javaparser.generator.core.node.CloneGenerator") |
| 206 | public IfStmt clone() { |
| 207 | return (IfStmt) accept(new CloneVisitor(), null); |
| 208 | } |
| 209 | |
| 210 | @Override |
| 211 | @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator") |
| 212 | public IfStmtMetaModel getMetaModel() { |
| 213 | return JavaParserMetaModel.ifStmtMetaModel; |
| 214 | } |
| 215 | |
| 216 | @Override |
| 217 | @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator") |
| 218 | public boolean replace(Node node, Node replacementNode) { |
| 219 | if (node == null) |
| 220 | return false; |
| 221 | if (node == condition) { |
| 222 | setCondition((Expression) replacementNode); |
| 223 | return true; |
| 224 | } |
| 225 | if (elseStmt != null) { |
| 226 | if (node == elseStmt) { |
| 227 | setElseStmt((Statement) replacementNode); |
| 228 | return true; |
| 229 | } |
| 230 | } |
| 231 | if (node == thenStmt) { |
| 232 | setThenStmt((Statement) replacementNode); |
| 233 | return true; |
| 234 | } |
| 235 | return super.replace(node, replacementNode); |
| 236 | } |
| 237 | |
| 238 | @Override |
| 239 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 240 | public boolean isIfStmt() { |
| 241 | return true; |
| 242 | } |
| 243 | |
| 244 | @Override |
| 245 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 246 | public IfStmt asIfStmt() { |
| 247 | return this; |
| 248 | } |
| 249 | |
| 250 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 251 | public void ifIfStmt(Consumer<IfStmt> action) { |
| 252 | action.accept(this); |
| 253 | } |
| 254 | |
| 255 | @Override |
| 256 | @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| 257 | public Optional<IfStmt> toIfStmt() { |
| 258 | return Optional.of(this); |
| 259 | } |
| 260 | } |
| 261 |
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