plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/dsl/toplevel/ClassContextFilter.java

/*
 * Copyright 2000-2014 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 org.jetbrains.plugins.groovy.dsl.toplevel;

import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.Pair;
import com.intellij.patterns.ElementPattern;
import com.intellij.psi.*;
import com.intellij.util.ProcessingContext;
import com.intellij.util.containers.ConcurrentHashMap;
import org.jetbrains.plugins.groovy.dsl.GroovyClassDescriptor;
import org.jetbrains.plugins.groovy.lang.psi.impl.statements.expressions.ClassUtil;
import org.jetbrains.plugins.groovy.lang.psi.impl.statements.expressions.TypesUtil;

import java.util.Map;

/**
 * @author peter
 */
public class ClassContextFilter implements ContextFilter {
  private final Condition<Pair<PsiType, PsiFile>> myPattern;

  public ClassContextFilter(Condition<Pair<PsiType, PsiFile>> pattern) {
    myPattern = pattern;
  }

  @Override
  public boolean isApplicable(GroovyClassDescriptor descriptor, ProcessingContext ctx) {
    final PsiFile place = descriptor.getPlaceFile();
    return myPattern.value(Pair.create(ClassUtil.findPsiType(descriptor, ctx), place));
  }

  public static ClassContextFilter fromClassPattern(final ElementPattern pattern) {
    return new ClassContextFilter(new Condition<Pair<PsiType, PsiFile>>() {
      @Override
      public boolean value(Pair<PsiType, PsiFile> pair) {
        final PsiType type = pair.first;
        return type instanceof PsiClassType ? pattern.accepts(((PsiClassType)type).resolve()) : false;
      }
    });
  }

  public static ClassContextFilter subtypeOf(final String typeText) {
    return new ClassContextFilter(new Condition<Pair<PsiType, PsiFile>>() {
      @Override
      public boolean value(Pair<PsiType, PsiFile> p) {
        return isSubtype(p.first, p.second, typeText);
      }
    });
  }

  public static boolean isSubtype(PsiType checked, PsiFile placeFile, String typeText) {
    final boolean isClassType = checked instanceof PsiClassType;
    if (isClassType) {
      final PsiClass psiClass = ((PsiClassType)checked).resolve();
      if (psiClass != null) {
        final int i = typeText.indexOf("<");
        String rawName = i > 0 ? typeText.substring(0, i) : typeText;
        if (!ClassUtil.getSuperClassesWithCache(psiClass).containsKey(rawName)) {
          return false;
        }
      }
    }

    PsiType myType = getCachedType(typeText, placeFile);
    if (checked == PsiType.NULL) return myType == PsiType.NULL;
    return TypesUtil.isAssignableByMethodCallConversion(myType, checked, placeFile);
  }

  private static final Key<Map<String, PsiType>> CACHED_TYPES = Key.create("Cached types");

  public static PsiType getCachedType(String typeText, PsiFile context) {
    Map<String, PsiType> map = context.getUserData(CACHED_TYPES);
    if (map == null) {
      map = new ConcurrentHashMap<String, PsiType>();
      context.putUserData(CACHED_TYPES, map);
    }
    PsiType type = map.get(typeText);
    if (type == null || !type.isValid()) {
      type = JavaPsiFacade.getElementFactory(context.getProject()).createTypeFromText(typeText, context);
      map.put(typeText, type);
    }
    return type;
  }
}