java/java-psi-impl/src/com/intellij/psi/filters/element/ModifierFilter.java

/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.psi.filters.element;

import com.intellij.psi.*;
import com.intellij.psi.filters.ClassFilter;
import org.jetbrains.annotations.NonNls;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: ik
 * Date: 28.01.2003
 * Time: 20:29:25
 * To change this template use Options | File Templates.
 */
public class ModifierFilter extends ClassFilter{
  public final List<ModifierRestriction> myModifierRestrictions = new ArrayList<ModifierRestriction>();

  private ModifierFilter(){
    super(PsiModifierListOwner.class);
  }

  public ModifierFilter(@PsiModifier.ModifierConstant String modifier, boolean hasToBe){
    this();
    addModiferRestriction(modifier, hasToBe);
  }

  public ModifierFilter(String... modifiers){
    this();
    for (@PsiModifier.ModifierConstant String modifier : modifiers) {
      addModiferRestriction(modifier, true);
    }
  }

  private void addModiferRestriction(@PsiModifier.ModifierConstant String mod, boolean hasToBe){
    myModifierRestrictions.add(new ModifierRestriction(mod, hasToBe));
  }

  @Override
  public boolean isAcceptable(Object element, PsiElement context){
    if(element instanceof PsiModifierListOwner){
      final PsiModifierList list = ((PsiModifierListOwner)element).getModifierList();
      if(list == null) return true;
      for (final Object myModifierRestriction : myModifierRestrictions) {
        final ModifierRestriction psiModifer = (ModifierRestriction)myModifierRestriction;
        boolean shouldHave = psiModifer.myIsSet;
        if (shouldHave != list.hasModifierProperty(psiModifer.myModifierName)) {
          return false;
        }
      }
      return true;
    }
    return false;
  }

  protected static final class ModifierRestriction{
    @PsiModifier.ModifierConstant public final String myModifierName;
    public final boolean myIsSet;

    ModifierRestriction(@PsiModifier.ModifierConstant String modifierName, boolean isSet){
      myModifierName = modifierName;
      myIsSet = isSet;
    }
  }

  public String toString(){
    @NonNls String ret = "modifiers(";
    Iterator<ModifierRestriction> iter = myModifierRestrictions.iterator();
    while(iter.hasNext()){
      final ModifierRestriction rest = iter.next();
      ret += rest.myModifierName + "=" + rest.myIsSet;
      if(iter.hasNext()){
        ret += ", ";
      }
    }
    ret += ")";
    return ret;
  }
}