Created
December 8, 2016 15:26
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Unreferenced spring beans across multiple files
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public class UnusedBeans { | |
private Map<String, Node> defs = new HashMap<String, Node>(); | |
private Set<String> refs = new HashSet<String>(); | |
public void read() throws Exception { | |
String content = new String(Files.readAllBytes(Paths.get("xml.txt"))); | |
for (String line : content.split("\n")) { | |
parse("../" + line.trim()); | |
} | |
for (Entry<String, Node> each : defs.entrySet()) { | |
if (!refs.contains(each.getKey())) { | |
Set<String> aliases = new HashSet<>(getAllNames((Element) each.getValue())); | |
aliases.remove(each.getKey()); | |
boolean referencedByAlias = false; | |
for (String alias : aliases) { | |
if (refs.contains(alias)) { | |
referencedByAlias = true; | |
} | |
} | |
if (!referencedByAlias) { | |
System.out.println("Not referenced " + each.getKey()); | |
} else { | |
// System.out.println("Alias unused, but used elsewhere" + each.getKey()); | |
} | |
} | |
} | |
} | |
private void parse(String trim) throws Exception { | |
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(trim)); | |
defs.putAll(getBeanDefs(doc)); | |
refs.addAll(getBeansRefs(doc)); | |
} | |
public static void main(String[] args) throws Exception { | |
new UnusedBeans().read(); | |
} | |
private Map<String, Node> getBeanDefs(Document doc) throws Exception { | |
Map<String, Node> map = new LinkedHashMap<String, Node>(); | |
XPath xpath = XPathFactory.newInstance().newXPath(); | |
NodeList result = (NodeList) xpath.compile("/beans/bean").evaluate(doc, XPathConstants.NODESET); | |
String defaultLazy = doc.getDocumentElement().getAttribute("default-lazy-init"); | |
if ("false".equals(defaultLazy)) { | |
return map; | |
} | |
for (int i = 0; i < result.getLength(); i++) { | |
Element element = (Element) result.item(i); | |
String lazyInit = element.getAttribute("lazy-init"); | |
if ("false".equals(lazyInit)) { | |
continue; | |
} | |
for (String each : getAllNames(element)) { | |
map.put(each, element); | |
} | |
} | |
return map; | |
} | |
private Set<String> getAllNames(Element element) { | |
String id = element.getAttribute("id"); | |
String name = element.getAttribute("name"); | |
Set<String> names = new HashSet<>(); | |
if (id != null && id.length() > 0) { | |
names.add(id); | |
} | |
if (name != null && name.trim().length() > 0) { | |
String[] bits = name.split(","); | |
for (String bit : bits) { | |
if (bit.length() > 0) { | |
names.add(bit); | |
} | |
} | |
} | |
return names; | |
} | |
/** | |
* @param doc | |
* @return | |
* @throws Exception | |
*/ | |
private Set<String> getBeansRefs(Document doc) throws Exception { | |
Set<String> refs = new HashSet<String>(); | |
XPath xpath = XPathFactory.newInstance().newXPath(); | |
refs.addAll(addAll((NodeList) xpath.compile("//bean[@parent]/@parent").evaluate(doc, XPathConstants.NODESET))); | |
refs.addAll(addAll((NodeList) xpath.compile("//ref[@bean]/@bean").evaluate(doc, XPathConstants.NODESET))); | |
refs.addAll(addAll((NodeList) xpath.compile("//*[@ref]/@ref").evaluate(doc, XPathConstants.NODESET))); | |
refs.addAll(addAll( | |
(NodeList) xpath.compile("//bean[@factory-bean]/@factory-bean").evaluate(doc, XPathConstants.NODESET))); | |
return refs; | |
} | |
private Set<String> addAll(NodeList list) { | |
Set<String> refs = new HashSet<String>(); | |
for (int i = 0; i < list.getLength(); i++) { | |
Attr element = (Attr) list.item(i); | |
refs.add(element.getValue().trim()); | |
} | |
return refs; | |
} | |
} |
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