/*

 * 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.nodeTypes.NodeWithStatements;

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.SwitchEntryMetaModel;

import static com.github.javaparser.utils.Utils.assertNotNull;

/**

 * <h1>One case in a switch statement</h1>

 * The main Javadoc is in {@link SwitchStmt}

 * <h2>Java 1.0-11</h2>

 * <pre>{@code

 * switch (i) {

 *   case 1:

 *   case 2:

 *     System.out.println(444);

 *     break;

 *   default:

 *     System.out.println(0);

 * }

 * }</pre>

 * <br>

 * This contains three SwitchEntrys. All of them are of type STATEMENT_GROUP.

 * <ul>

 *     <li>The first one has label 1 and no statements.</li>

 *     <li>The second has label 2 and two statements (the println and the break).</li>

 *     <li>The third, the default, has no label and one statement.</li>

 * </ul>

 * <h2>Java 12-</h2>

 * <pre>{@code

 *     case 1 -> 15*15;

 *     case 2 -> { a++; b++; }

 *     case 3 -> throw new Exception();

 * }</pre>

 * These are three new variants.

 * <ul>

 *     <li>The first one is of type EXPRESSION and stores its {@link Expression} in an {@link ExpressionStmt} which is stored as the first and only statement in statements.</li>

 *     <li>The second one is of type BLOCK and stores its {@link BlockStmt} as the first and only statement in statements.</li>

 *     <li>The third one is of type THROWS_STATEMENT and stores its {@link ThrowStmt} as the first and only statement in statements.</li>

 * </ul>

 * <pre>{@code

 *     case MONDAY, FRIDAY, SUNDAY -> 6;

 * }</pre>

 * Multiple case labels are now allowed.

 * <pre>{@code

 *     case 16*16, 10+10 -> 6;

 * }</pre>

 * Many kinds of expressions are now allowed.

 *

 * @author Julio Vilmar Gesser

 * @see SwitchStmt

 * @see com.github.javaparser.ast.expr.SwitchExpr

 */

public class SwitchEntry extends Node implements NodeWithStatements<SwitchEntry> {

    public enum Type {

        STATEMENT_GROUP, EXPRESSION, BLOCK, THROWS_STATEMENT

    }

    private NodeList<Expression> labels;

    private NodeList<Statement> statements;

    private Type type;

    public SwitchEntry() {

        this(null, new NodeList<Expression>(), Type.STATEMENT_GROUP, new NodeList<>());

    }

    @AllFieldsConstructor

    public SwitchEntry(final NodeList<Expression> labels, final Type type, final NodeList<Statement> statements) {

        this(null, labels, type, statements);

    }

    /**

     * This constructor is used by the parser and is considered private.

     */

    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")

    public SwitchEntry(TokenRange tokenRange, NodeList<Expression> labels, Type type, NodeList<Statement> statements) {

        super(tokenRange);

        setLabels(labels);

        setType(type);

        setStatements(statements);

        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 NodeList<Expression> getLabels() {

        return labels;

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public NodeList<Statement> getStatements() {

        return statements;

    }

    /**

     * Sets the label

     *

     * @param labels the label, can be null

     * @return this, the SwitchEntry

     */

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public SwitchEntry setLabels(final NodeList<Expression> labels) {

        assertNotNull(labels);

        if (labels == this.labels) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.LABELS, this.labels, labels);

        if (this.labels != null)

            this.labels.setParentNode(null);

        this.labels = labels;

        setAsParentNodeOf(labels);

        return this;

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public SwitchEntry setStatements(final NodeList<Statement> statements) {

        assertNotNull(statements);

        if (statements == this.statements) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.STATEMENTS, this.statements, statements);

        if (this.statements != null)

            this.statements.setParentNode(null);

        this.statements = statements;

        setAsParentNodeOf(statements);

        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 < labels.size(); i++) {

            if (labels.get(i) == node) {

                labels.remove(i);

                return true;

            }

        }

        for (int i = 0; i < statements.size(); i++) {

            if (statements.get(i) == node) {

                statements.remove(i);

                return true;

            }

        }

        return super.remove(node);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.CloneGenerator")

    public SwitchEntry clone() {

        return (SwitchEntry) accept(new CloneVisitor(), null);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")

    public SwitchEntryMetaModel getMetaModel() {

        return JavaParserMetaModel.switchEntryMetaModel;

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public Type getType() {

        return type;

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public SwitchEntry setType(final Type type) {

        assertNotNull(type);

        if (type == this.type) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.TYPE, this.type, type);

        this.type = type;

        return 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 < labels.size(); i++) {

            if (labels.get(i) == node) {

                labels.set(i, (Expression) replacementNode);

                return true;

            }

        }

        for (int i = 0; i < statements.size(); i++) {

            if (statements.get(i) == node) {

                statements.set(i, (Statement) replacementNode);

                return true;

            }

        }

        return super.replace(node, replacementNode);

    }

}