java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/JavaClassListReferenceProvider.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.psi.impl.source.resolve.reference.impl.providers;
  17
  18 import com.intellij.openapi.progress.ProgressManager;
  19 import com.intellij.openapi.project.Project;
  20 import com.intellij.openapi.util.NotNullLazyValue;
  21 import com.intellij.psi.PsiElement;
  22 import com.intellij.psi.PsiPackage;
  23 import com.intellij.psi.PsiReference;
  24 import com.intellij.psi.xml.XmlTag;
  25 import com.intellij.psi.search.GlobalSearchScope;
  26 import org.jetbrains.annotations.NotNull;
  27
  28 import java.util.*;
  29
  30 /**
  31  * Created by IntelliJ IDEA.
  32  * User: ik
  33  * Date: 05.06.2003
  34  * Time: 20:27:59
  35  * To change this template use Options | File Templates.
  36  */
  37 public class JavaClassListReferenceProvider extends JavaClassReferenceProvider {
  38
  39   public JavaClassListReferenceProvider(final Project project) {
  40     super(GlobalSearchScope.allScope(project), project);
  41     setOption(ADVANCED_RESOLVE, Boolean.TRUE);
  42   }
  43
  44   @NotNull
  45   public PsiReference[] getReferencesByString(String str, PsiElement position, int offsetInPosition){
  46     if (position instanceof XmlTag && ((XmlTag)position).getValue().getTextElements().length == 0) {
  47       return PsiReference.EMPTY_ARRAY;
  48     }
  49
  50     if (str.length() < 2) {
  51       return PsiReference.EMPTY_ARRAY;
  52     }
  53     NotNullLazyValue<Set<String>> topLevelPackages = new NotNullLazyValue<Set<String>>() {
  54       @NotNull
  55       @Override
  56       protected Set<String> compute() {
  57         final Set<String> knownTopLevelPackages = new HashSet<String>();
  58         final List<PsiElement> defaultPackages = getDefaultPackages();
  59         for (final PsiElement pack : defaultPackages) {
  60           if (pack instanceof PsiPackage) {
  61             knownTopLevelPackages.add(((PsiPackage)pack).getName());
  62           }
  63         }
  64         return knownTopLevelPackages;
  65       }
  66     };
  67     final List<PsiReference> results = new ArrayList<PsiReference>();
  68
  69     for(int dot = str.indexOf('.'); dot > 0; dot = str.indexOf('.', dot + 1)) {
  70       int start = dot;
  71       while (start > 0 && Character.isLetterOrDigit(str.charAt(start - 1))) start--;
  72       if (dot == start) {
  73         continue;
  74       }
  75       String candidate = str.substring(start, dot);
  76       if (topLevelPackages.getValue().contains(candidate)) {
  77         int end = dot;
  78         while (end < str.length() - 1) {
  79           end++;
  80           char ch = str.charAt(end);
  81           if (ch != '.' && !Character.isJavaIdentifierPart(ch)) {
  82             break;
  83           }
  84         }
  85         String s = str.substring(start, end + 1);
  86         results.addAll(Arrays.asList(new JavaClassReferenceSet(s, position, offsetInPosition + start, false, this){
  87           public boolean isSoft(){
  88             return true;
  89           }
  90         }.getAllReferences()));
  91         ProgressManager.getInstance().checkCanceled();
  92       }
  93     }
  94     return results.toArray(new PsiReference[results.size()]);
  95   }
  96 }