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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;

import com.google.common.base.Objects;
import org.sonar.plugins.java.api.tree.IdentifierTree;
import org.sonar.plugins.java.api.tree.PrimitiveTypeTree;
import org.sonar.plugins.java.api.tree.SyntaxToken;
import org.sonar.plugins.java.api.tree.Tree;

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

public final class SyntacticEquivalence {

  private SyntacticEquivalence() {
  }

  /**
   * @return true, if nodes are syntactically equivalent
   */
  public static boolean areEquivalent(List leftList, List rightList) {
    if(leftList.size()!= rightList.size()) {
      return false;
    }
    for(int i =0; i iteratorA = leftNode.childrenIterator();
    Iterator iteratorB = rightNode.childrenIterator();

    while (iteratorA.hasNext() && iteratorB.hasNext()) {
      if (!areEquivalent(iteratorA.next(), iteratorB.next())) {
        return false;
      }
    }

    return !iteratorA.hasNext() && !iteratorB.hasNext();
  }

  /**
   * Caller must guarantee that nodes of the same kind.
   */
  private static boolean areLeafsEquivalent(JavaTree leftNode, JavaTree rightNode) {
    if (leftNode instanceof IdentifierTree) {
      return Objects.equal(((IdentifierTree) leftNode).name(), ((IdentifierTree) rightNode).name());
    } else if (leftNode instanceof PrimitiveTypeTree) {
      return Objects.equal(((PrimitiveTypeTree) leftNode).keyword().text(), ((PrimitiveTypeTree) rightNode).keyword().text());
    } else if (leftNode instanceof SyntaxToken) {
      return Objects.equal(((SyntaxToken) leftNode).text(), ((SyntaxToken) rightNode).text());
    } else {
      throw new IllegalArgumentException();
    }
  }

}