com.github.javaparser.ast.stmt.SwitchStmt Maven / Gradle / Ivy
/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2021 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser.ast.stmt;
import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.AllFieldsConstructor;
import com.github.javaparser.ast.Generated;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.NameExpr;
import com.github.javaparser.ast.nodeTypes.SwitchNode;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.visitor.CloneVisitor;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.VoidVisitor;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import com.github.javaparser.metamodel.SwitchStmtMetaModel;
import java.util.Optional;
import java.util.function.Consumer;
import static com.github.javaparser.utils.Utils.assertNotNull;
/**
* The switch statement
*
* Java 1.0-1.4
* The basic C-like switch statement.
* It can switch only on integers.
*
{@code switch(x) { case 5: case 6: a=100; break; case 9: a=33; break; default: throw new IllegalStateException(); };}
*
In {@code switch(a) { ... }} the selector is "a",
* and the contents of the { ... } are the entries.
*
* Java 5-6
* Switching can now also be done on enum constants.
*
* Java 7-11
* Switching can now also be done on strings.
*
* Java 12
* In preparation for pattern matching, lots of changes are made:
*
* - multiple labels per case
*
- a -> syntax that does not fall through.
*
- break can take any expression (usable in the {@link com.github.javaparser.ast.expr.SwitchExpr})
*
- switch can be used as an expression (it becomes a {@link com.github.javaparser.ast.expr.SwitchExpr})
*
* {@code switch(x) { case BANANA,PEAR: b=10; break; default: b=5; };}
*
{@code switch(x) { case 5,6 -> println("uhuh"); default -> println("nope"); };}
*
* Java 13
* The break statement has been reverted to what it was before Java 12, and break-with-value is now the YieldStatement.
*
* @author Julio Vilmar Gesser
* @see SwitchEntry
* @see com.github.javaparser.ast.expr.SwitchExpr
* @see SwitchNode
* @see BreakStmt
* @see YieldStmt
*/
public class SwitchStmt extends Statement implements SwitchNode {
private Expression selector;
private NodeList entries;
public SwitchStmt() {
this(null, new NameExpr(), new NodeList<>());
}
@AllFieldsConstructor
public SwitchStmt(final Expression selector, final NodeList entries) {
this(null, selector, entries);
}
/**
* This constructor is used by the parser and is considered private.
*/
@Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
public SwitchStmt(TokenRange tokenRange, Expression selector, NodeList entries) {
super(tokenRange);
setSelector(selector);
setEntries(entries);
customInitialization();
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public R accept(final GenericVisitor v, final A arg) {
return v.visit(this, arg);
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public void accept(final VoidVisitor v, final A arg) {
v.visit(this, arg);
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public NodeList getEntries() {
return entries;
}
public SwitchEntry getEntry(int i) {
return getEntries().get(i);
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public Expression getSelector() {
return selector;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public SwitchStmt setEntries(final NodeList entries) {
assertNotNull(entries);
if (entries == this.entries) {
return this;
}
notifyPropertyChange(ObservableProperty.ENTRIES, this.entries, entries);
if (this.entries != null)
this.entries.setParentNode(null);
this.entries = entries;
setAsParentNodeOf(entries);
return this;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public SwitchStmt setSelector(final Expression selector) {
assertNotNull(selector);
if (selector == this.selector) {
return this;
}
notifyPropertyChange(ObservableProperty.SELECTOR, this.selector, selector);
if (this.selector != null)
this.selector.setParentNode(null);
this.selector = selector;
setAsParentNodeOf(selector);
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator")
public boolean remove(Node node) {
if (node == null) {
return false;
}
for (int i = 0; i < entries.size(); i++) {
if (entries.get(i) == node) {
entries.remove(i);
return true;
}
}
return super.remove(node);
}
@Override
@Generated("com.github.javaparser.generator.core.node.CloneGenerator")
public SwitchStmt clone() {
return (SwitchStmt) accept(new CloneVisitor(), null);
}
@Override
@Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
public SwitchStmtMetaModel getMetaModel() {
return JavaParserMetaModel.switchStmtMetaModel;
}
@Override
@Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
public boolean replace(Node node, Node replacementNode) {
if (node == null) {
return false;
}
for (int i = 0; i < entries.size(); i++) {
if (entries.get(i) == node) {
entries.set(i, (SwitchEntry) replacementNode);
return true;
}
}
if (node == selector) {
setSelector((Expression) replacementNode);
return true;
}
return super.replace(node, replacementNode);
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public boolean isSwitchStmt() {
return true;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public SwitchStmt asSwitchStmt() {
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public void ifSwitchStmt(Consumer action) {
action.accept(this);
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public Optional toSwitchStmt() {
return Optional.of(this);
}
}