Mercurial > dive4elements > river
changeset 959:a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
flys-artifacts/trunk@2378 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Wed, 20 Jul 2011 16:28:49 +0000 |
| parents | ae198bef4ba0 |
| children | 92027887775a |
| files | flys-artifacts/ChangeLog flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/App.java flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java |
| diffstat | 4 files changed, 124 insertions(+), 18 deletions(-) [+] |
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--- a/flys-artifacts/ChangeLog Wed Jul 20 15:06:16 2011 +0000 +++ b/flys-artifacts/ChangeLog Wed Jul 20 16:28:49 2011 +0000 @@ -1,3 +1,18 @@ +2011-07-20 Sascha L. Teichmann <sascha.teichmann@intevation.de> + + * src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java: + New. Custom XPath function provider. Provides + 'dc:contains(Object [] haystack, Object needle)' by now. Should be + useful to check containments in 'out' lists later. + + * src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java: + Register the FunctionResolver to the evaluated XPaths. + + * src/main/java/de/intevation/flys/artifacts/services/meta/App.java: + Added code to parse + "param:a,b,c" to "param" -> new String [] { "a", "b", "c" } to + help testing the 'dc:contains' XPath function. + 2011-07-20 Ingo Weinzierl <ingo@intevation.de> * doc/conf/conf.xml: Added wms configurations for Saar, Mosel and Elbe.
--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/App.java Wed Jul 20 15:06:16 2011 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/App.java Wed Jul 20 16:28:49 2011 +0000 @@ -41,12 +41,11 @@ String [] parts = PARAMETERS.split("\\s*;\\s*"); for (String part: parts) { String [] kv = part.split("\\s*:\\s*"); - if (kv.length < 2) { + if (kv.length < 2 || (kv[0] = kv[0].trim()).length() == 0) { continue; } - if ((kv[0] = kv[0].trim()).length() > 0) { - map.put(kv[0], kv[1]); - } + String [] values = kv[1].split("\\s*,\\s*"); + map.put(kv[0], values.length == 1 ? values[0] : values); } return map; }
--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java Wed Jul 20 15:06:16 2011 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java Wed Jul 20 16:28:49 2011 +0000 @@ -206,21 +206,12 @@ continue; } - try { - XPath xpath = XPATH_FACTORY.newXPath(); - xpath.setXPathVariableResolver(frames); - Object result = xpath.evaluate( - test, EVAL_DOCUMENT, XPathConstants.BOOLEAN); + Boolean result = evaluateXPath(test); + if (result != null && result.booleanValue()) { + branch = child; + break; + } - if (result instanceof Boolean - && ((Boolean)result).booleanValue()) { - branch = child; - break; - } - } - catch (XPathExpressionException xfce) { - log.error(xfce); - } continue; } else if ("otherwise".equals(name)) { @@ -237,6 +228,24 @@ } } + protected Boolean evaluateXPath(String expr) { + try { + XPath xpath = XPATH_FACTORY.newXPath(); + xpath.setXPathVariableResolver(frames); + xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS); + Object result = xpath.evaluate( + expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN); + + return result instanceof Boolean + ? (Boolean)result + : null; + } + catch (XPathExpressionException xfce) { + log.error(xfce); + } + return null; + } + protected void convert(Node parent, Element current) { String variable = expand(current.getAttribute("var"));
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java Wed Jul 20 16:28:49 2011 +0000 @@ -0,0 +1,83 @@ +package de.intevation.flys.artifacts.services.meta; + +import java.util.List; +import java.util.ArrayList; + +import javax.xml.xpath.XPathFunctionResolver; +import javax.xml.xpath.XPathFunction; +import javax.xml.xpath.XPathFunctionException; + +import javax.xml.namespace.QName; + +public class FunctionResolver +implements XPathFunctionResolver +{ + public static final String FUNCTION_NAMESPACE_URI = "dc"; + + public static final class Entry { + + String name; + XPathFunction function; + int arity; + + public Entry() { + } + + public Entry(String name, XPathFunction function, int arity) { + this.name = name; + this.function = function; + this.arity = arity; + } + } // class Entry + + public static final FunctionResolver FUNCTIONS = new FunctionResolver(); + + static { + FUNCTIONS.addFunction("contains", 2, new XPathFunction() { + @Override + public Object evaluate(List args) throws XPathFunctionException { + try { + Object [] haystack = (Object [])args.get(0); + Object needle = args.get(1); + for (Object straw: haystack) { + if (straw.equals(needle)) { + return Boolean.TRUE; + } + } + return Boolean.FALSE; + } + catch (Exception e) { + throw new XPathFunctionException(e); + } + } + }); + } + + protected List<Entry> functions; + + public FunctionResolver() { + functions = new ArrayList<Entry>(); + } + + public void addFunction(String name, int arity, XPathFunction function) { + functions.add(new Entry(name, function, arity)); + } + + @Override + public XPathFunction resolveFunction(QName functionName, int arity) { + + if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { + return null; + } + + String name = functionName.getLocalPart(); + for (Entry entry: functions) { + if (entry.arity == arity && entry.name.equals(name)) { + return entry.function; + } + } + + return null; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :