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/*
* Copyright (C) 2007-2010 Júlio 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.Range;
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.Arrays;
import java.util.List;
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;
/**
* A lambda expression. 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 UnknownType.
* If they are in ( ), "isEnclosingParameters" is true.
* The body is to the right of the ->.
* <br/><code>(a, b) -> a+b</code>
* <br/><code>a -> ...</code>
* <br/><code>(Long a) -> {println(a);}</code>
*
* @author Raquel Pau
*/
public 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);
}
public LambdaExpr(Range range, NodeList<Parameter> parameters, Statement body, boolean isEnclosingParameters) {
super(range);
setParameters(parameters);
setBody(body);
setEnclosingParameters(isEnclosingParameters);
}
@Override
public NodeList<Parameter> getParameters() {
return parameters;
}
@Override
public LambdaExpr setParameters(final NodeList<Parameter> parameters) {
assertNotNull(parameters);
notifyPropertyChange(ObservableProperty.PARAMETERS, this.parameters, parameters);
if (this.parameters != null)
this.parameters.setParentNode(null);
this.parameters = parameters;
setAsParentNodeOf(parameters);
return this;
}
public Statement getBody() {
return body;
}
public LambdaExpr setBody(final Statement body) {
assertNotNull(body);
notifyPropertyChange(ObservableProperty.BODY, this.body, body);
if (this.body != null)
this.body.setParentNode(null);
this.body = body;
setAsParentNodeOf(body);
return this;
}
@Override
public <R, A> R accept(GenericVisitor<R, A> v, A arg) {
return v.visit(this, arg);
}
@Override
public <A> void accept(VoidVisitor<A> v, A arg) {
v.visit(this, arg);
}
public boolean isEnclosingParameters() {
return isEnclosingParameters;
}
public LambdaExpr setEnclosingParameters(final boolean isEnclosingParameters) {
notifyPropertyChange(ObservableProperty.ENCLOSING_PARAMETERS, this.isEnclosingParameters, isEnclosingParameters);
this.isEnclosingParameters = isEnclosingParameters;
return this;
}
@Override
public List<NodeList<?>> getNodeLists() {
return Arrays.asList(getParameters());
}
@Override
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);
}
@DerivedProperty
public Optional<Expression> getExpressionBody() {
if (body instanceof ExpressionStmt) {
return Optional.of(((ExpressionStmt) body).getExpression());
} else {
return Optional.empty();
}
}
@Override
public LambdaExpr clone() {
return (LambdaExpr) accept(new CloneVisitor(), null);
}
@Override
public LambdaExprMetaModel getMetaModel() {
return JavaParserMetaModel.lambdaExprMetaModel;
}
}
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