PatternExpr.java
/*
* Copyright (C) 2007-2010 J��lio Vilmar Gesser.
* Copyright (C) 2011, 2013-2023 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.expr;
import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.*;
import com.github.javaparser.ast.nodeTypes.NodeWithSimpleName;
import com.github.javaparser.ast.nodeTypes.NodeWithType;
import com.github.javaparser.ast.nodeTypes.modifiers.NodeWithFinalModifier;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.type.ClassOrInterfaceType;
import com.github.javaparser.ast.type.ReferenceType;
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.PatternExprMetaModel;
import java.util.Optional;
import java.util.function.Consumer;
import static com.github.javaparser.utils.Utils.assertNotNull;
/**
* <h1>The instanceof statement</h1>
*
* <h2>Java 1.0 to 13</h2>
* Not available.
* <br>
* <h2>Java 14</h2>
* Since JDK14, it is possible to bind a variable that is cast to the type being tested against.
* This is referred to as a {@code Pattern} within <a href="https://bugs.openjdk.java.net/browse/JDK-8181287">JEP305</a>,
* and avoids the need to cast to the desired type.
* <br>
* Example:
* <br>
* <pre>{@code
* tool instanceof Drill d
* ^^^^^^^
* Pattern
* }</pre>
* <br>Note: While this is exclusively used within {@code instanceof} operators for now, JEP305 suggests this might
* be used more widely in the future (e.g. in switch expressions/statements).
* <br>
* <br>
* <h3>JDK14 Grammar</h3>
* Per JEP305 (not currently listed within the JLS):
* <br>
* <pre>{@code Pattern:
* ReferenceType Identifier}</pre>
*
* @author Roger Howell
*
* @see com.github.javaparser.ast.expr.InstanceOfExpr
* @see <a href="https://bugs.openjdk.java.net/browse/JDK-8181287">JEP305: https://bugs.openjdk.java.net/browse/JDK-8181287</a>
* @see <a href="https://docs.oracle.com/javase/specs/jls/se11/html/jls-15.html#jls-15.20">https://docs.oracle.com/javase/specs/jls/se11/html/jls-15.html#jls-15.20</a>
*/
public class PatternExpr extends Expression implements NodeWithSimpleName<PatternExpr>, NodeWithType<PatternExpr, ReferenceType>, NodeWithFinalModifier<PatternExpr> {
private NodeList<Modifier> modifiers;
private SimpleName name;
private ReferenceType type;
public PatternExpr() {
this(null, new NodeList<>(), new ClassOrInterfaceType(), new SimpleName());
}
@AllFieldsConstructor
public PatternExpr(final NodeList<Modifier> modifiers, final ReferenceType type, SimpleName name) {
this(null, modifiers, type, name);
}
/**
* This constructor is used by the parser and is considered private.
*/
@Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
public PatternExpr(TokenRange tokenRange, NodeList<Modifier> modifiers, ReferenceType type, SimpleName name) {
super(tokenRange);
setModifiers(modifiers);
setType(type);
setName(name);
customInitialization();
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) {
return v.visit(this, arg);
}
@Override
@Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
public <A> void accept(final VoidVisitor<A> v, final A arg) {
v.visit(this, arg);
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public SimpleName getName() {
return name;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public ReferenceType getType() {
return type;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public PatternExpr setName(final SimpleName name) {
assertNotNull(name);
if (name == this.name) {
return this;
}
notifyPropertyChange(ObservableProperty.NAME, this.name, name);
if (this.name != null)
this.name.setParentNode(null);
this.name = name;
setAsParentNodeOf(name);
return this;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public PatternExpr setType(final ReferenceType type) {
assertNotNull(type);
if (type == this.type) {
return this;
}
notifyPropertyChange(ObservableProperty.TYPE, this.type, type);
if (this.type != null)
this.type.setParentNode(null);
this.type = type;
setAsParentNodeOf(type);
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public boolean isPatternExpr() {
return true;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public PatternExpr asPatternExpr() {
return this;
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public Optional<PatternExpr> toPatternExpr() {
return Optional.of(this);
}
@Override
@Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
public void ifPatternExpr(Consumer<PatternExpr> action) {
action.accept(this);
}
@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 < modifiers.size(); i++) {
if (modifiers.get(i) == node) {
modifiers.set(i, (Modifier) replacementNode);
return true;
}
}
if (node == name) {
setName((SimpleName) replacementNode);
return true;
}
if (node == type) {
setType((ReferenceType) replacementNode);
return true;
}
return super.replace(node, replacementNode);
}
@Override
@Generated("com.github.javaparser.generator.core.node.CloneGenerator")
public PatternExpr clone() {
return (PatternExpr) accept(new CloneVisitor(), null);
}
@Override
@Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
public PatternExprMetaModel getMetaModel() {
return JavaParserMetaModel.patternExprMetaModel;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public NodeList<Modifier> getModifiers() {
return modifiers;
}
@Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
public PatternExpr setModifiers(final NodeList<Modifier> modifiers) {
assertNotNull(modifiers);
if (modifiers == this.modifiers) {
return this;
}
notifyPropertyChange(ObservableProperty.MODIFIERS, this.modifiers, modifiers);
if (this.modifiers != null)
this.modifiers.setParentNode(null);
this.modifiers = modifiers;
setAsParentNodeOf(modifiers);
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 < modifiers.size(); i++) {
if (modifiers.get(i) == node) {
modifiers.remove(i);
return true;
}
}
return super.remove(node);
}
}