platform/duplicates-analysis/src/com/intellij/dupLocator/treeHash/DuplicatesProfileBase.java

package com.intellij.dupLocator.treeHash;

import com.intellij.dupLocator.*;
import com.intellij.dupLocator.util.DuplocatorUtil;
import com.intellij.dupLocator.util.PsiFragment;
import com.intellij.lang.Language;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.TokenSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author Eugene.Kudelevsky
 */
public abstract class DuplicatesProfileBase extends DuplicatesProfile {
  @NotNull
  @Override
  public DuplocateVisitor createVisitor(@NotNull FragmentsCollector collector) {
    return new NodeSpecificHasherBase(DuplocatorSettings.getInstance(), collector, this);
  }

  public abstract int getNodeCost(@NotNull PsiElement element);

  public TokenSet getLiterals() {
    return TokenSet.EMPTY;
  }

  @Override
  @NotNull
  public ExternalizableDuplocatorState getDuplocatorState(@NotNull Language language) {
    return DuplocatorUtil.registerAndGetState(language);
  }

  @Override
  public boolean isMyDuplicate(@NotNull DupInfo info, int index) {
    PsiFragment[] fragments = info.getFragmentOccurences(index);
    if (fragments.length > 0) {
      PsiElement[] elements = fragments[0].getElements();
      if (elements.length > 0) {
        final PsiElement first = elements[0];
        if (first != null) {
          Language language = first.getLanguage();
          return isMyLanguage(language);
        }
      }
    }
    return false;
  }

  @Nullable
  public PsiElementRole getRole(@NotNull PsiElement element) {
    return null;
  }

}