java/java-impl/src/com/intellij/codeInsight/template/macro/SubtypesMacro.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.codeInsight.template.macro;
  17
  18 import com.intellij.codeInsight.CodeInsightUtil;
  19 import com.intellij.codeInsight.lookup.LookupElement;
  20 import com.intellij.codeInsight.template.*;
  21 import com.intellij.codeInsight.template.impl.JavaTemplateUtil;
  22 import com.intellij.openapi.util.Condition;
  23 import com.intellij.psi.PsiDocumentManager;
  24 import com.intellij.psi.PsiElement;
  25 import com.intellij.psi.PsiFile;
  26 import com.intellij.psi.PsiType;
  27 import com.intellij.util.containers.HashSet;
  28 import org.jetbrains.annotations.NotNull;
  29
  30 import java.util.LinkedHashSet;
  31 import java.util.Set;
  32
  33 public class SubtypesMacro implements Macro {
  34   public String getName() {
  35     return "subtypes";
  36   }
  37
  38   public String getDescription() {
  39     return "subtypes(TYPE)";
  40   }
  41
  42   public String getDefaultValue() {
  43     return "A";
  44   }
  45
  46   public Result calculateResult(@NotNull Expression[] params, ExpressionContext context) {
  47     if (params.length == 0) return null;
  48     return params[0].calculateQuickResult(context);
  49   }
  50
  51   public Result calculateQuickResult(@NotNull Expression[] params, ExpressionContext context) {
  52     return calculateResult(params, context);
  53   }
  54
  55   public LookupElement[] calculateLookupItems(@NotNull Expression[] params, ExpressionContext context) {
  56     if (params.length == 0) return LookupElement.EMPTY_ARRAY;
  57     Result paramResult = params[0].calculateQuickResult(context);
  58     if (paramResult instanceof PsiTypeResult) {
  59       final PsiType type = ((PsiTypeResult)paramResult).getType();
  60       Set<PsiType> types = new HashSet<PsiType>();
  61       types.add(type);
  62       final PsiFile file = PsiDocumentManager.getInstance(context.getProject()).getPsiFile(context.getEditor().getDocument());
  63       final PsiElement element = file.findElementAt(context.getStartOffset());
  64       types.addAll(CodeInsightUtil.addSubtypes(type, element, false, Condition.TRUE));
  65       final Set<LookupElement> set = new LinkedHashSet<LookupElement>();
  66       for (PsiType t: types) {
  67         JavaTemplateUtil.addTypeLookupItem(set, t);
  68       }
  69       return set.toArray(new LookupElement[set.size()]);
  70     }
  71     return LookupElement.EMPTY_ARRAY;
  72   }
  73 }