java/java-impl/src/com/intellij/codeInspection/dataFlow/value/DfaNotNullValue.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
  17 /*
  18  * Created by IntelliJ IDEA.
  19  * User: max
  20  * Date: Jan 28, 2002
  21  * Time: 6:45:14 PM
  22  * To change template for new class use
  23  * Code Style | Class Templates options (Tools | IDE Options).
  24  */
  25 package com.intellij.codeInspection.dataFlow.value;
  26
  27 import com.intellij.psi.PsiType;
  28 import com.intellij.util.containers.HashMap;
  29 import org.jetbrains.annotations.NotNull;
  30
  31 import java.util.ArrayList;
  32
  33 public class DfaNotNullValue extends DfaValue {
  34   public static class Factory {
  35     private final DfaNotNullValue mySharedInstance;
  36     private final HashMap<String,ArrayList<DfaNotNullValue>> myStringToObject;
  37     private final DfaValueFactory myFactory;
  38
  39     Factory(DfaValueFactory factory) {
  40       myFactory = factory;
  41       mySharedInstance = new DfaNotNullValue(factory);
  42       myStringToObject = new HashMap<String, ArrayList<DfaNotNullValue>>();
  43     }
  44
  45     @NotNull
  46     public DfaValue create(PsiType type) {
  47       if (type == null) return DfaUnknownValue.getInstance();
  48       mySharedInstance.myType = type;
  49
  50       String id = mySharedInstance.toString();
  51       ArrayList<DfaNotNullValue> conditions = myStringToObject.get(id);
  52       if (conditions == null) {
  53         conditions = new ArrayList<DfaNotNullValue>();
  54         myStringToObject.put(id, conditions);
  55       }
  56       else {
  57         for (DfaNotNullValue value : conditions) {
  58           if (value.hardEquals(mySharedInstance)) return value;
  59         }
  60       }
  61
  62       DfaNotNullValue result = new DfaNotNullValue(type, myFactory);
  63       conditions.add(result);
  64       return result;
  65     }
  66   }
  67
  68   private PsiType myType;
  69
  70   private DfaNotNullValue(PsiType myType, DfaValueFactory factory) {
  71     super(factory);
  72     this.myType = myType;
  73   }
  74
  75   private DfaNotNullValue(DfaValueFactory factory) {
  76     super(factory);
  77   }
  78
  79   @SuppressWarnings({"HardCodedStringLiteral"})
  80   public String toString() {
  81     return "@notnull " + myType.getCanonicalText();
  82   }
  83
  84   public PsiType getType() {
  85     return myType;
  86   }
  87
  88   private boolean hardEquals(DfaNotNullValue aNotNull) {
  89     return aNotNull.myType == myType;
  90   }
  91 }