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/*
 * SonarQube Java
 * Copyright (C) 2012 SonarSource
 * [email protected]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of 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.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.java.model.statement;

import com.google.common.base.Preconditions;
import com.google.common.collect.Iterators;
import org.sonar.java.ast.api.JavaKeyword;
import org.sonar.java.ast.api.JavaPunctuator;
import org.sonar.java.model.InternalSyntaxToken;
import org.sonar.java.model.JavaTree;
import org.sonar.plugins.java.api.tree.ExpressionTree;
import org.sonar.plugins.java.api.tree.ForStatementTree;
import org.sonar.plugins.java.api.tree.StatementTree;
import org.sonar.plugins.java.api.tree.SyntaxToken;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.TreeVisitor;

import javax.annotation.Nullable;
import java.util.Iterator;
import java.util.List;

public class ForStatementTreeImpl extends JavaTree implements ForStatementTree {
  private final List initializer;
  @Nullable
  private final ExpressionTree condition;
  private final List update;
  private final StatementTree statement;

  public ForStatementTreeImpl(List initializer, @Nullable ExpressionTree condition, List update, StatementTree statement) {
    super(Kind.FOR_STATEMENT);
    this.initializer = Preconditions.checkNotNull(initializer);
    this.condition = condition;
    this.update = Preconditions.checkNotNull(update);
    this.statement = Preconditions.checkNotNull(statement);
  }

  @Override
  public Kind getKind() {
    return Kind.FOR_STATEMENT;
  }

  @Override
  public SyntaxToken forKeyword() {
    return InternalSyntaxToken.createLegacy(getAstNode().getFirstChild(JavaKeyword.FOR));
  }

  @Override
  public SyntaxToken openParenToken() {
    return InternalSyntaxToken.createLegacy(getAstNode().getFirstChild(JavaPunctuator.LPAR));
  }

  @Override
  public List initializer() {
    return initializer;
  }

  @Override
  public SyntaxToken firstSemicolonToken() {
    return InternalSyntaxToken.createLegacy(getAstNode().getChildren(JavaPunctuator.SEMI).get(0));
  }

  @Nullable
  @Override
  public ExpressionTree condition() {
    return condition;
  }

  @Override
  public SyntaxToken secondSemicolonToken() {
    return InternalSyntaxToken.createLegacy(getAstNode().getChildren(JavaPunctuator.SEMI).get(1));
  }

  @Override
  public List update() {
    return update;
  }

  @Override
  public SyntaxToken closeParenToken() {
    return InternalSyntaxToken.createLegacy(getAstNode().getFirstChild(JavaPunctuator.RPAR));
  }

  @Override
  public StatementTree statement() {
    return statement;
  }

  @Override
  public void accept(TreeVisitor visitor) {
    visitor.visitForStatement(this);
  }

  @Override
  public Iterator childrenIterator() {
    return Iterators.concat(
      initializer.iterator(),
      Iterators.singletonIterator(condition),
      update.iterator(),
      Iterators.singletonIterator(statement));
  }

}