| /* |
| * Copyright (C) 2007-2010 JĂșlio Vilmar Gesser. |
| * Copyright (C) 2011, 2013-2016 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.ast.AllFieldsConstructor; |
| import com.github.javaparser.ast.NodeList; |
| import com.github.javaparser.ast.body.Parameter; |
| import com.github.javaparser.ast.nodeTypes.NodeWithParameters; |
| import com.github.javaparser.ast.observer.ObservableProperty; |
| import com.github.javaparser.ast.stmt.ExpressionStmt; |
| import com.github.javaparser.ast.stmt.ReturnStmt; |
| import com.github.javaparser.ast.stmt.Statement; |
| import com.github.javaparser.ast.visitor.GenericVisitor; |
| import com.github.javaparser.ast.visitor.VoidVisitor; |
| import java.util.Optional; |
| import static com.github.javaparser.utils.Utils.assertNotNull; |
| import com.github.javaparser.ast.Node; |
| import com.github.javaparser.ast.visitor.CloneVisitor; |
| import com.github.javaparser.metamodel.DerivedProperty; |
| import com.github.javaparser.metamodel.LambdaExprMetaModel; |
| import com.github.javaparser.metamodel.JavaParserMetaModel; |
| import javax.annotation.Generated; |
| import com.github.javaparser.TokenRange; |
| import java.util.function.Consumer; |
| |
| /** |
| * <h1>A lambda expression</h1> |
| * <h2>Java 1-7</h2> |
| * Does not exist. |
| * <h2>Java 8+</h2> |
| * <code>(a, b) -> a + b</code> |
| * <br/><code>a -> ...</code> |
| * <br/><code>(Long a) -> { println(a); }</code> |
| * <p/>The parameters are on the left side of the ->. |
| * If a parameter uses type inference (it has no type specified) then its type is set to <code>UnknownType</code>. |
| * If they are in ( ), "isEnclosingParameters" is true. |
| * <br/>The body is to the right of the ->. |
| * The body is either a BlockStatement when it is in { } braces, or an ExpressionStatement when it is not in braces. |
| * |
| * @author Raquel Pau |
| */ |
| public final class LambdaExpr extends Expression implements NodeWithParameters<LambdaExpr> { |
| |
| private NodeList<Parameter> parameters; |
| |
| private boolean isEnclosingParameters; |
| |
| private Statement body; |
| |
| public LambdaExpr() { |
| this(null, new NodeList<>(), new ReturnStmt(), false); |
| } |
| |
| @AllFieldsConstructor |
| public LambdaExpr(NodeList<Parameter> parameters, Statement body, boolean isEnclosingParameters) { |
| this(null, parameters, body, isEnclosingParameters); |
| } |
| |
| /** |
| * This constructor is used by the parser and is considered private. |
| */ |
| @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator") |
| public LambdaExpr(TokenRange tokenRange, NodeList<Parameter> parameters, Statement body, boolean isEnclosingParameters) { |
| super(tokenRange); |
| setParameters(parameters); |
| setBody(body); |
| setEnclosingParameters(isEnclosingParameters); |
| customInitialization(); |
| } |
| |
| @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| public NodeList<Parameter> getParameters() { |
| return parameters; |
| } |
| |
| @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| public LambdaExpr setParameters(final NodeList<Parameter> parameters) { |
| assertNotNull(parameters); |
| if (parameters == this.parameters) { |
| return (LambdaExpr) this; |
| } |
| notifyPropertyChange(ObservableProperty.PARAMETERS, this.parameters, parameters); |
| if (this.parameters != null) |
| this.parameters.setParentNode(null); |
| this.parameters = parameters; |
| setAsParentNodeOf(parameters); |
| return this; |
| } |
| |
| /** |
| * @return a BlockStatement or an ExpressionStatement. See class Javadoc. |
| */ |
| @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| public Statement getBody() { |
| return body; |
| } |
| |
| @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| public LambdaExpr setBody(final Statement body) { |
| assertNotNull(body); |
| if (body == this.body) { |
| return (LambdaExpr) this; |
| } |
| notifyPropertyChange(ObservableProperty.BODY, this.body, body); |
| if (this.body != null) |
| this.body.setParentNode(null); |
| this.body = body; |
| setAsParentNodeOf(body); |
| return this; |
| } |
| |
| @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 boolean isEnclosingParameters() { |
| return isEnclosingParameters; |
| } |
| |
| @Generated("com.github.javaparser.generator.core.node.PropertyGenerator") |
| public LambdaExpr setEnclosingParameters(final boolean isEnclosingParameters) { |
| if (isEnclosingParameters == this.isEnclosingParameters) { |
| return (LambdaExpr) this; |
| } |
| notifyPropertyChange(ObservableProperty.ENCLOSING_PARAMETERS, this.isEnclosingParameters, isEnclosingParameters); |
| this.isEnclosingParameters = isEnclosingParameters; |
| 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 < parameters.size(); i++) { |
| if (parameters.get(i) == node) { |
| parameters.remove(i); |
| return true; |
| } |
| } |
| return super.remove(node); |
| } |
| |
| /** |
| * @return if the body of this lambda is a simple expression, return that expression. |
| * Otherwise (when the body is a block) return Optional.empty(). |
| */ |
| @DerivedProperty |
| public Optional<Expression> getExpressionBody() { |
| if (body.isExpressionStmt()) { |
| return Optional.of(body.asExpressionStmt().getExpression()); |
| } else { |
| return Optional.empty(); |
| } |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.CloneGenerator") |
| public LambdaExpr clone() { |
| return (LambdaExpr) accept(new CloneVisitor(), null); |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator") |
| public LambdaExprMetaModel getMetaModel() { |
| return JavaParserMetaModel.lambdaExprMetaModel; |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator") |
| public boolean replace(Node node, Node replacementNode) { |
| if (node == null) |
| return false; |
| if (node == body) { |
| setBody((Statement) replacementNode); |
| return true; |
| } |
| for (int i = 0; i < parameters.size(); i++) { |
| if (parameters.get(i) == node) { |
| parameters.set(i, (Parameter) replacementNode); |
| return true; |
| } |
| } |
| return super.replace(node, replacementNode); |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| public boolean isLambdaExpr() { |
| return true; |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| public LambdaExpr asLambdaExpr() { |
| return this; |
| } |
| |
| @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| public void ifLambdaExpr(Consumer<LambdaExpr> action) { |
| action.accept(this); |
| } |
| |
| @Override |
| @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator") |
| public Optional<LambdaExpr> toLambdaExpr() { |
| return Optional.of(this); |
| } |
| } |