platform/indexing-api/src/com/intellij/psi/search/SingleTargetRequestResultProcessor.java

/*
 * Copyright 2000-2013 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.search;

import com.intellij.openapi.progress.ProgressManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import com.intellij.psi.PsiReferenceService;
import com.intellij.psi.ReferenceRange;
import com.intellij.util.Processor;
import org.jetbrains.annotations.NotNull;

import java.util.List;

/**
 * @author peter
 */
public final class SingleTargetRequestResultProcessor extends RequestResultProcessor {
  private static final PsiReferenceService ourReferenceService = PsiReferenceService.getService();
  private final PsiElement myTarget;

  public SingleTargetRequestResultProcessor(@NotNull PsiElement target) {
    super(target);
    myTarget = target;
  }

  @Override
  public boolean processTextOccurrence(@NotNull PsiElement element, int offsetInElement, @NotNull final Processor<PsiReference> consumer) {
    if (!myTarget.isValid()) {
      return false;
    }

    final List<PsiReference> references = ourReferenceService.getReferences(element,
                                                                            new PsiReferenceService.Hints(myTarget, offsetInElement));
    for (PsiReference ref : references) {
      ProgressManager.checkCanceled();
      if (ReferenceRange.containsOffsetInElement(ref, offsetInElement) && ref.isReferenceTo(myTarget) && !consumer.process(ref)) {
        return false;
      }
    }
    return true;
  }

  @SuppressWarnings("HardCodedStringLiteral")
  @Override
  public String toString() {
    return "SingleTarget: " + myTarget;
  }
}