Return-Path: X-Original-To: apmail-db-derby-dev-archive@www.apache.org Delivered-To: apmail-db-derby-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id A36A7CAB9 for ; Thu, 4 Jul 2013 08:29:23 +0000 (UTC) Received: (qmail 72397 invoked by uid 500); 4 Jul 2013 08:29:23 -0000 Delivered-To: apmail-db-derby-dev-archive@db.apache.org Received: (qmail 72373 invoked by uid 500); 4 Jul 2013 08:29:23 -0000 Mailing-List: contact derby-dev-help@db.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: Delivered-To: mailing list derby-dev@db.apache.org Received: (qmail 72311 invoked by uid 99); 4 Jul 2013 08:29:23 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 04 Jul 2013 08:29:23 +0000 Date: Thu, 4 Jul 2013 08:29:23 +0000 (UTC) From: "Knut Anders Hatlen (JIRA)" To: derby-dev@db.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (DERBY-6075) Use modern collections in impl/sql/compile MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/DERBY-6075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Knut Anders Hatlen updated DERBY-6075: -------------------------------------- Issue Type: Improvement (was: Bug) > Use modern collections in impl/sql/compile > ------------------------------------------ > > Key: DERBY-6075 > URL: https://issues.apache.org/jira/browse/DERBY-6075 > Project: Derby > Issue Type: Improvement > Components: SQL > Affects Versions: 10.10.1.1 > Reporter: Knut Anders Hatlen > Assignee: Knut Anders Hatlen > Priority: Minor > Labels: derby_backport_reject_10_10 > Fix For: 10.11.0.0 > > Attachments: Compile.java, d6075-10a-aggregate-vectors.diff, d6075-11a-remaining-vectors.diff, d6075-12a-stack.diff, d6075-13a-unused-properties.diff, d6075-14a-dead-syntax.diff, d6075-15a-sqlgrammar-vectors.diff, d6075-16a-negative-test.diff, d6075-17a-rename-aggregate-vectors.diff, d6075-18a-rename.diff, d6075-1a-CollectNodesVisitor.diff, d6075-2a-bindExpression.diff, d6075-3a-javadoc.diff, d6075-4a-parameterList.diff, d6075-5a-ordering.diff, d6075-6a-DMLModStatementNode.diff, d6075-7a-more-signatures.diff, d6075-8a-local-hashtables.diff, d6075-9a-hashtable-fields.diff > > > The code in the org.apache.derby.impl.sql.compile package predates the Java Collections Framework and uses old-style collections like java.util.Vector and java.util.Hashtable. Since the old-style collection classes are used in many method signatures, it's difficult to use modern collection classes when adding new code. > I suggest we switch to using interfaces (like java.util.List and java.util.Map) instead of specific classes in the signatures, so that we have more flexibility in choosing the right collection class for the job. > Only changing the signatures would allow us to continue using Vector and Hashtable, since they implement the interfaces. However, I think it would be good to switch to ArrayList and HashMap in a second step. The instances in impl/sql/compile are not shared between threads, so we don't need the synchronization provided by the old-style classes. Switching to unsynchronized classes may make compilation slightly faster. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira