java/java-impl/src/com/intellij/codeInsight/template/macro/VariableTypeMacroBase.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.lookup.LookupElement;
  19 import com.intellij.codeInsight.template.*;
  20 import com.intellij.codeInsight.template.impl.JavaTemplateUtil;
  21 import com.intellij.psi.PsiElement;
  22 import org.jetbrains.annotations.NotNull;
  23 import org.jetbrains.annotations.Nullable;
  24
  25 import java.util.LinkedHashSet;
  26 import java.util.Set;
  27
  28 /**
  29  * @author ven
  30  */
  31 public abstract class VariableTypeMacroBase implements Macro {
  32   @Nullable
  33   protected abstract PsiElement[] getVariables(Expression[] params, final ExpressionContext context);
  34
  35   public LookupElement[] calculateLookupItems(@NotNull Expression[] params, final ExpressionContext context) {
  36     final PsiElement[] vars = getVariables(params, context);
  37     if (vars == null || vars.length < 2) return null;
  38     Set<LookupElement> set = new LinkedHashSet<LookupElement>();
  39     for (PsiElement element : vars) {
  40       JavaTemplateUtil.addElementLookupItem(set, element);
  41     }
  42     return set.toArray(new LookupElement[set.size()]);
  43   }
  44
  45   public Result calculateResult(@NotNull Expression[] params, ExpressionContext context) {
  46     final PsiElement[] vars = getVariables(params, context);
  47     if (vars == null || vars.length == 0) return null;
  48     return new JavaPsiElementResult(vars[0]);
  49   }
  50
  51   public Result calculateQuickResult(@NotNull Expression[] params, ExpressionContext context) {
  52     return null;
  53   }
  54
  55   public String getDefaultValue() {
  56     return "a";
  57   }
  58
  59 }