Refactor hashCode method in AclImpl

 Extract magic number 31 to variable

Signed-off-by: kimjg <[email protected]>

Author: k42ke

acl/src/main/java/org/springframework/security/acls/domain/AclImpl.java

@@ -298,15 +298,17 @@ public boolean equals(Object obj) {
 	@Override
 	public int hashCode() {
 		int result = (this.parentAcl != null) ? this.parentAcl.hashCode() : 0;
-		result = 31 * result + this.aclAuthorizationStrategy.hashCode();
-		result = 31 * result
+		int thirtyOne = 31;
+
+		result = thirtyOne * result + this.aclAuthorizationStrategy.hashCode();
+		result = thirtyOne * result
 				+ ((this.permissionGrantingStrategy != null) ? this.permissionGrantingStrategy.hashCode() : 0);
-		result = 31 * result + ((this.aces != null) ? this.aces.hashCode() : 0);
-		result = 31 * result + this.objectIdentity.hashCode();
-		result = 31 * result + this.id.hashCode();
-		result = 31 * result + ((this.owner != null) ? this.owner.hashCode() : 0);
-		result = 31 * result + ((this.loadedSids != null) ? this.loadedSids.hashCode() : 0);
-		result = 31 * result + (this.entriesInheriting ? 1 : 0);
+		result = thirtyOne * result + ((this.aces != null) ? this.aces.hashCode() : 0);
+		result = thirtyOne * result + this.objectIdentity.hashCode();
+		result = thirtyOne * result + this.id.hashCode();
+		result = thirtyOne * result + ((this.owner != null) ? this.owner.hashCode() : 0);
+		result = thirtyOne * result + ((this.loadedSids != null) ? this.loadedSids.hashCode() : 0);
+		result = thirtyOne * result + (this.entriesInheriting ? 1 : 0);
 		return result;
 	}