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      1 /*
      2  * Copyright (C) 2008 The Guava Authors
      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 package com.google.common.collect.testing.features;
     18 
     19 import com.google.common.collect.testing.Helpers;
     20 
     21 import java.util.Collections;
     22 import java.util.Set;
     23 
     24 /**
     25  * Encapsulates the constraints that a class under test must satisfy in order
     26  * for a tester method to be run against that class.
     27  *
     28  * <p>This class is GWT compatible.
     29  *
     30  * @author George van den Driessche
     31  */
     32 public final class TesterRequirements {
     33   private final Set<Feature<?>> presentFeatures;
     34   private final Set<Feature<?>> absentFeatures;
     35 
     36   public TesterRequirements(
     37       Set<Feature<?>> presentFeatures, Set<Feature<?>> absentFeatures) {
     38     this.presentFeatures = Helpers.copyToSet(presentFeatures);
     39     this.absentFeatures = Helpers.copyToSet(absentFeatures);
     40   }
     41 
     42   public TesterRequirements(TesterRequirements tr) {
     43     this(tr.getPresentFeatures(), tr.getAbsentFeatures());
     44   }
     45 
     46   public TesterRequirements() {
     47     this(Collections.<Feature<?>>emptySet(),
     48         Collections.<Feature<?>>emptySet());
     49   }
     50 
     51   public final Set<Feature<?>> getPresentFeatures() {
     52     return presentFeatures;
     53   }
     54 
     55   public final Set<Feature<?>> getAbsentFeatures() {
     56     return absentFeatures;
     57   }
     58 
     59   @Override public boolean equals(Object object) {
     60     if (object == this) {
     61       return true;
     62     }
     63     if (object instanceof TesterRequirements) {
     64       TesterRequirements that = (TesterRequirements) object;
     65       return this.presentFeatures.equals(that.presentFeatures)
     66           && this.absentFeatures.equals(that.absentFeatures);
     67     }
     68     return false;
     69   }
     70 
     71   @Override public int hashCode() {
     72     return presentFeatures.hashCode() * 31 + absentFeatures.hashCode();
     73   }
     74 
     75   @Override public String toString() {
     76     return "{TesterRequirements: present="
     77         + presentFeatures + ", absent=" + absentFeatures + "}";
     78   }
     79 
     80   private static final long serialVersionUID = 0;
     81 }
     82