I am using a thirdparty library that is handing me a map. I have been using
jxpath to fish values out of nested structures in the map values.... but now I
need to know the map *key* values. I know how to get the *entries*, but the
finding out the keys from jxpath eludes me.
public void jxpathMapTest() throws Exception {
Map<String,String> m = new HashMap<String,String>();
m.put("one-key", "one-value");
m.put("two-key", "two-value");
JXPathContext jxPathContext = JXPathContext.newContext(m);
jxPathContext.setLenient(true);
Scanner scanner = new Scanner(System.in);
String s = null;
while ((s = scanner.nextLine()) != null) {
try {
System.out.println
("==============================================================");
System.out.println ("trying " + s);
for (Iterator<? extends Object> i = jxPathContext.iterate(s);
i.hasNext(); ) {
Object o = i.next();
if (o == null) {
System.out.println ("null");
} else {
System.out.println (o.getClass() + ", value '" + o + "'");
}
}
} catch (Exception e) {
System.out.println (s + " failed: " + e);
}
}
}
Test results:
==============================================================
trying /
class java.util.HashMap, value '{two-key=two-value, one-key=one-value}'
==============================================================
trying /*
class java.lang.String, value 'one-value'
class java.lang.String, value 'two-value'
==============================================================
trying /@name
==============================================================
trying /name
==============================================================
trying /key
==============================================================
trying /keys()
/keys() failed: org.apache.commons.jxpath.JXPathInvalidSyntaxException: Invalid
XPath: '/keys()'. Syntax error after: '/k'
