plugins/InspectionGadgets/src/com/siyeh/ig/psiutils/TypeUtils.java

   1 /*
   2  * Copyright 2003-2009 Dave Griffith, Bas Leijdekkers
   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.siyeh.ig.psiutils;
  17
  18 import com.intellij.openapi.project.Project;
  19 import com.intellij.psi.*;
  20 import org.jetbrains.annotations.NonNls;
  21 import org.jetbrains.annotations.NotNull;
  22 import org.jetbrains.annotations.Nullable;
  23
  24 public class TypeUtils {
  25
  26     private TypeUtils() {}
  27
  28     public static boolean expressionHasType(
  29             @NonNls @NotNull String typeName,
  30             @Nullable PsiExpression expression) {
  31         if (expression == null) {
  32             return false;
  33         }
  34         final PsiType type = expression.getType();
  35         return typeEquals(typeName, type);
  36     }
  37
  38     public static boolean typeEquals(@NonNls @NotNull String typeName,
  39                                      @Nullable PsiType targetType) {
  40         return targetType != null && targetType.equalsToText(typeName);
  41     }
  42
  43     public static PsiType getJavaLangObjectType(@NotNull PsiElement context) {
  44         final Project project = context.getProject();
  45         final PsiElementFactory factory =
  46                 JavaPsiFacade.getInstance(project).getElementFactory();
  47         return factory.createTypeFromText("java.lang.Object", context);
  48     }
  49
  50     public static boolean isJavaLangObject(@Nullable PsiType targetType) {
  51         return typeEquals("java.lang.Object", targetType);
  52     }
  53
  54     public static boolean isJavaLangString(@Nullable PsiType targetType) {
  55         return typeEquals("java.lang.String", targetType);
  56     }
  57
  58     public static boolean expressionHasTypeOrSubtype(
  59             @Nullable PsiExpression expression,
  60             @NonNls @NotNull String typeName) {
  61         if (expression == null) {
  62             return false;
  63         }
  64         final PsiType type = expression.getType();
  65         if (type == null) {
  66             return false;
  67         }
  68         if (!(type instanceof PsiClassType)) {
  69             return false;
  70         }
  71         final PsiClassType classType = (PsiClassType) type;
  72         final PsiClass aClass = classType.resolve();
  73         return aClass != null && ClassUtils.isSubclass(aClass, typeName);
  74     }
  75
  76     public static String expressionHasTypeOrSubtype(
  77             @Nullable PsiExpression expression,
  78             @NonNls @NotNull String... typeNames) {
  79         if (expression == null) {
  80             return null;
  81         }
  82         final PsiType type = expression.getType();
  83         if (type == null) {
  84             return null;
  85         }
  86         if (!(type instanceof PsiClassType)) {
  87             return null;
  88         }
  89         final PsiClassType classType = (PsiClassType) type;
  90         final PsiClass aClass = classType.resolve();
  91         if (aClass == null) {
  92             return null;
  93         }
  94         for (String typeName : typeNames) {
  95             if (ClassUtils.isSubclass(aClass, typeName)) {
  96                 return typeName;
  97             }
  98         }
  99         return null;
 100     }
 101 }