[infer][java] Simplify some of the models

Reviewed By: jvillard

Differential Revision: D5267207

fbshipit-source-id: 7a7c3fc

infer/models/java/src/java/util/AbstractList.java

@@ -12,7 +12,7 @@ package java.util;
 import com.facebook.infer.builtins.InferUndefined;
 
 // could make List an abstract class directly instead, but that breaks other models
-public abstract class AbstractList<T> extends AbstractCollection<T> {
+public abstract class AbstractList<T> {
 
   // need three-value state for unknown (-1), false (0), or true (1)
   // the reason we can't use a bool is that we want to return either true or false each time we call

infer/models/java/src/java/util/ArrayList.java

@@ -12,9 +12,7 @@ package java.util;
 import java.io.Serializable;
 
 // abstract so we don't have to implement every method of List
-public abstract class ArrayList<T>
-  extends AbstractList<T>
-  implements RandomAccess, Cloneable, Serializable {
+public abstract class ArrayList<T> extends AbstractList<T> {
 
   @Override
   public boolean isEmpty() {

infer/models/java/src/java/util/HashMap.java

@@ -24,16 +24,14 @@ import com.facebook.infer.builtins.InferUndefined;
  * get(key).
 */
 
-public abstract class HashMap<K,V> extends AbstractMap<K,V>
-  implements Map<K,V>, Cloneable, Serializable {
+public abstract class HashMap<K,V> {
 
-  private Object lastKey1 = null;
-  private Object lastKey2 = null;
+  private K lastKey1 = null;
+  private K lastKey2 = null;
 
-  public boolean containsKey(Object key) {
+  public boolean containsKey(K key) {
     // doesn't actually check if _containsKey(key). If you just put a
     // key in the map, why would you check if it's still there?
-
     if (InferUndefined.boolean_undefined()) {
       pushKey(key);
       return true;
@@ -42,7 +40,7 @@ public abstract class HashMap<K,V> extends AbstractMap<K,V>
     }
   }
 
-  public V get(Object key) {
+  public V get(K key) {
     if (_containsKey(key)) {
       return (V)InferUndefined.object_undefined();
     } else if (InferUndefined.boolean_undefined()) {
@@ -64,17 +62,16 @@ public abstract class HashMap<K,V> extends AbstractMap<K,V>
 
 
   /** some sort of circular buffer simulator */
-  private void pushKey(Object key) {
+  private void pushKey(K key) {
     lastKey2 = lastKey1;
     lastKey1 = key;
   }
 
-  private boolean _containsKey(Object key) {
+  private boolean _containsKey(K key) {
       return areEqual(key, lastKey1) || areEqual(key, lastKey2);
   }
 
-  /* does explicit dynamic dispatch to help Infer out */
-  private static boolean areEqual(Object x, Object y) {
+  private boolean areEqual(K x, K y) {
     return x == y;
   }
 

infer/models/java/src/java/util/List.java

@@ -12,9 +12,7 @@ package java.util;
 import java.io.Serializable;
 
 // abstract so we don't have to implement every method of List
-public abstract class List<T>
-  extends AbstractList<T>
-  implements Collection<T>, Iterable<T> {
+public abstract class List<T> extends AbstractList<T> {
 
   @Override
   public boolean isEmpty() {

infer/models/java/src/java/util/Scanner.java

@@ -18,7 +18,7 @@ import java.io.IOException;
 import java.lang.IllegalArgumentException;
 
 
-public class Scanner extends Object {
+public class Scanner {
 
   InputStream src;
   private void init(InputStream source) {

infer/models/java/src/java/util/Vector.java

@@ -11,9 +11,9 @@ package java.util;
 
 import com.facebook.infer.builtins.InferUndefined;
 
-public abstract class Vector<E> extends AbstractList<E> {
+public abstract class Vector<E> {
 
-    protected Object[] elementData;
+    protected E[] elementData;
 
     E elementData(int index) {
         return (E) elementData[index];