/*
 * 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.impl.source.resolve.reference;

import com.intellij.openapi.project.IndexNotReadyException;
import com.intellij.patterns.ElementPattern;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReferenceProvider;
import com.intellij.psi.PsiReferenceService;
import com.intellij.util.ProcessingContext;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;

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

/**
 * Created by IntelliJ IDEA.
 * User: ik
 * Date: 01.04.2003
 * Time: 16:52:28
 * To change this template use Options | File Templates.
 */
public class SimpleProviderBinding<Provider> implements ProviderBinding<Provider> {
  private final List<ProviderInfo<Provider, ElementPattern>> myProviderPairs = ContainerUtil.createLockFreeCopyOnWriteList();

  public void registerProvider(Provider provider, ElementPattern pattern, double priority) {
    myProviderPairs.add(new ProviderInfo<Provider, ElementPattern>(provider, pattern, priority));
  }

  @Override
  public void addAcceptableReferenceProviders(@NotNull PsiElement position,
                                              @NotNull List<ProviderInfo<Provider, ProcessingContext>> list,
                                              @NotNull PsiReferenceService.Hints hints) {
    for (ProviderInfo<Provider, ElementPattern> trinity : myProviderPairs) {
      if (hints != PsiReferenceService.Hints.NO_HINTS && !((PsiReferenceProvider)trinity.provider).acceptsHints(position, hints)) {
        continue;
      }

      final ProcessingContext context = new ProcessingContext();
      if (hints != PsiReferenceService.Hints.NO_HINTS) {
        context.put(PsiReferenceService.HINTS, hints);
      }
      boolean suitable = false;
      try {
        suitable = trinity.processingContext.accepts(position, context);
      }
      catch (IndexNotReadyException ignored) {
      }
      if (suitable) {
        list.add(new ProviderInfo<Provider, ProcessingContext>(trinity.provider, context, trinity.priority));
      }
    }
  }

  @Override
  public void unregisterProvider(@NotNull final Provider provider) {
    for (final ProviderInfo<Provider, ElementPattern> trinity : new ArrayList<ProviderInfo<Provider, ElementPattern>>(myProviderPairs)) {
      if (trinity.provider.equals(provider)) {
        myProviderPairs.remove(trinity);
      }
    }
  }
}