{ "version": "https://jsonfeed.org/version/1.1", "title": "chem-bla-ics", "description": "Chemblaics (pronounced chem-bla-ics) is the science that uses open science and computers to solve problems in chemistry, biochemistry and related fields.", "home_page_url": "https://chem-bla-ics.linkedchemistry.info/", "feed_url": "https://chem-bla-ics.linkedchemistry.info/2010/05/23/pmd-code-checking-checking-for.json", "icon": "https://chem-bla-ics.linkedchemistry.info/assets/images/chem-bla-ics_logo.png", "language": "en", "authors": [ { "name": "Egon Willighagen", "url": "https://orcid.org/0000-0001-7542-0286", "_orcid": "0000-0001-7542-0286" } ], "items": [ { "id": "https://doi.org/10.59350/9wby7-sdm26", "url": "https://chem-bla-ics.linkedchemistry.info/2010/05/23/pmd-code-checking-checking-for.html", "title": "PMD code checking: checking for programming against CDK interfaces", "content_html": "

I wrote recently about programming against interfaces ,\nwhich led to some discussion. Rajarshi commented:

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patch 2 seems to replace usage of Molecule with Molecule, rather than IMolecule

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Now, this particularly problem was Eclipse being overly active cleaning up the imports, but we reached the\npoint that it is actually interesting to have PMD warn about these issues. PMD is a cool piece of software used\nby the CDK project for a long time one. One particular cool thing is that you can write code warnings as\nXPath queries.

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So, I promised Rajarshi to have a look at a custom rule to look at using IMolecule instead of Molecule. The code is actually pretty simple, using the aforementioned XPath feature:

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<rule name=\"ReplaceMoleculeWithIMolecule\"\n      language=\"java\"\n      message=\"Use the IMolecule interfaces instead of the Molecule implementation\"\n      class=\"net.sourceforge.pmd.rules.XPathRule\">\n  <description>\n      Programming against the CDK interfaces allows users to pick their favorite\n      implementation (nonotify, datadebug).\n  </description>\n  <priority>3</priority>\n  <properties>\n    <property name=\"xpath\">\n      <value>\n <![CDATA[\n   //Type/ReferenceType/ClassOrInterfaceType[@Image='Molecule']\n ]]>\n      </value>\n    </property>\n  </properties>\n    <example>\n    <![CDATA[\n      Molecule mol = builder.newInstance(IMolecule.class);\n    ]]>\n  </example>\n</rule>\n
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Patch pending…

", "summary": "I wrote recently about programming against interfaces , which led to some discussion. Rajarshi commented:", "date_published": "2010-05-23T00:00:00+00:00", "date_modified": "2026-07-05T00:00:00+00:00", "tags": ["cdk","java","pmd"], "authors": [ { "name": "Egon Willighagen", "url": "https://orcid.org/0000-0001-7542-0286" } ] } ] }