Add java.lang.String#hashCode(), java.lang.System.identityHashCode(), and java.util.Objects.hashCode()

chitoku-k · chitoku-k · commit 7de369d46725 · 2019-05-07T14:44:39.000+09:00
diff --git a/src/Packages/java/lang/System.php b/src/Packages/java/lang/System.php
@@ -3,6 +3,7 @@
 
 use PHPJava\Exceptions\NotImplementedException;
 use PHPJava\Packages\java\lang\_Object;
+use PHPJava\Packages\PHPJava\Kernel\Behavior\System as SystemBehavior;
 
 // use PHPJava\Packages\java\lang\System\Logger;
 // use PHPJava\Packages\java\util\Map;
@@ -194,12 +195,11 @@ public static function static_getSecurityManager($a = null)
      *
      * @param mixed $a
      * @return mixed
-     * @throws NotImplementedException
-     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/package-summary.html#identityHashCode
+     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/System.html#identityHashCode(java.lang.Object)
      */
     public static function static_identityHashCode($a = null)
     {
-        throw new NotImplementedException(__METHOD__);
+        return SystemBehavior::identityHashCode($a);
     }
 
     /**
diff --git a/src/Packages/java/lang/_String.php b/src/Packages/java/lang/_String.php
@@ -19,6 +19,7 @@
  */
 class _String extends _Object implements CharSequence
 {
+    private $hash = 0;
     private $object = null;
 
     /**
@@ -223,8 +224,7 @@ public function endsWith($a = null)
      *
      * @param mixed $a
      * @return mixed
-     * @throws NotImplementedException
-     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/package-summary.html#equals
+     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html#equals(java.lang.Object)
      */
     public function equals($a = null)
     {
@@ -304,14 +304,24 @@ public function getChars($a = null, $b = null, $c = null, $d = null)
     /**
      * Returns a hash code for this string.
      *
-     * @param mixed $a
      * @return mixed
-     * @throws NotImplementedException
-     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/package-summary.html#hashCode
+     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html#hashCode()
      */
-    public function hashCode($a = null)
+    public function hashCode()
     {
-        throw new NotImplementedException(__METHOD__);
+        $count = $this->length();
+
+        $h = $this->hash;
+        if ($h || !$count) {
+            return $h;
+        }
+
+        $str = $this->toString();
+        for ($i = 0; $i < $count; ++$i) {
+            $h = 31 * $h + ord($str[$i]);
+        }
+
+        return $this->hash = $h;
     }
 
     /**
diff --git a/src/Packages/java/util/Objects.php b/src/Packages/java/util/Objects.php
@@ -120,12 +120,15 @@ public static function static_hash($a = null)
      *
      * @param mixed $a
      * @return mixed
-     * @throws NotImplementedException
-     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/package-summary.html#hashCode
+     * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Objects.html#hashCode(java.lang.Object)
      */
     public static function static_hashCode($a = null)
     {
-        throw new NotImplementedException(__METHOD__);
+        if ($a === null) {
+            return 0;
+        }
+
+        return $a->hashCode();
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -3,6 +3,7 @@`
`3`	`3`
`4`	`4`	`use PHPJava\Exceptions\NotImplementedException;`
`5`	`5`	`use PHPJava\Packages\java\lang\_Object;`
	`6`	`+use PHPJava\Packages\PHPJava\Kernel\Behavior\System as SystemBehavior;`
`6`	`7`
`7`	`8`	`// use PHPJava\Packages\java\lang\System\Logger;`
`8`	`9`	`// use PHPJava\Packages\java\util\Map;`
`@@ -194,12 +195,11 @@ public static function static_getSecurityManager($a = null)`
`194`	`195`	`*`
`195`	`196`	`* @param mixed $a`
`196`	`197`	`* @return mixed`
`197`		`- * @throws NotImplementedException`
`198`		`- * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/package-summary.html#identityHashCode`
	`198`	`+ * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/System.html#identityHashCode(java.lang.Object)`
`199`	`199`	`*/`
`200`	`200`	`public static function static_identityHashCode($a = null)`
`201`	`201`	`{`
`202`		`- throw new NotImplementedException(__METHOD__);`
	`202`	`+ return SystemBehavior::identityHashCode($a);`
`203`	`203`	`}`
`204`	`204`
`205`	`205`	`/**`
Original file line number	Diff line number	Diff line change
`@@ -120,12 +120,15 @@ public static function static_hash($a = null)`
`120`	`120`	`*`
`121`	`121`	`* @param mixed $a`
`122`	`122`	`* @return mixed`
`123`		`- * @throws NotImplementedException`
`124`		`- * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/package-summary.html#hashCode`
	`123`	`+ * @see https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Objects.html#hashCode(java.lang.Object)`
`125`	`124`	`*/`
`126`	`125`	`public static function static_hashCode($a = null)`
`127`	`126`	`{`
`128`		`- throw new NotImplementedException(__METHOD__);`
	`127`	`+ if ($a === null) {`
	`128`	`+ return 0;`
	`129`	`+ }`
	`130`	`+`
	`131`	`+ return $a->hashCode();`
`129`	`132`	`}`
`130`	`133`
`131`	`134`	`/**`