Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/FixingsFilterBuilder.java @ 2608:938e2f6c0c9a
Refactored the code of the fixings filter building to be useful in more cases.
flys-artifacts/trunk@4190 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 03 Apr 2012 13:46:16 +0000 |
parents | |
children | 2e129754d450 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/FixingsFilterBuilder.java Tue Apr 03 13:46:16 2012 +0000 @@ -0,0 +1,205 @@ +package de.intevation.flys.artifacts.model; + +import de.intevation.flys.artifacts.model.FixingsOverview.AndFilter; +import de.intevation.flys.artifacts.model.FixingsOverview.DateFilter; +import de.intevation.flys.artifacts.model.FixingsOverview.DateRangeFilter; + +import de.intevation.flys.artifacts.model.FixingsOverview.Fixing.Filter; + +import de.intevation.flys.artifacts.model.FixingsOverview.IdFilter; +import de.intevation.flys.artifacts.model.FixingsOverview.NotFilter; +import de.intevation.flys.artifacts.model.FixingsOverview.OrFilter; +import de.intevation.flys.artifacts.model.FixingsOverview.Range; +import de.intevation.flys.artifacts.model.FixingsOverview.SectorRangeFilter; + +import java.text.ParsePosition; +import java.text.SimpleDateFormat; + +import java.util.ArrayList; +import java.util.Date; +import java.util.List; + +import org.apache.log4j.Logger; + +import org.w3c.dom.Document; +import org.w3c.dom.Element; +import org.w3c.dom.Node; +import org.w3c.dom.NodeList; + +public class FixingsFilterBuilder +{ + private static Logger log = Logger.getLogger(FixingsFilterBuilder.class); + + protected Filter filter; + protected Range range; + + protected Document document; + + public FixingsFilterBuilder() { + } + + public FixingsFilterBuilder(Document document) { + this.document = document; + } + + public Filter getFilter() { + if (filter == null) { + filter = buildFilter(); + } + return filter; + } + + public Range getRange() { + if (range != null) { + range = buildRange(); + } + return range; + } + + public Document getDocument() { + return document; + } + + protected Range buildRange() { + + NodeList ranges = document.getElementsByTagName("range"); + + if (ranges.getLength() < 1) { + return FixingsOverview.FULL_EXTENT; + } + + Element range = (Element)ranges.item(0); + + String from = range.getAttribute("from").trim(); + String to = range.getAttribute("to" ).trim(); + + double start = -Double.MAX_VALUE; + double end = Double.MAX_VALUE; + + if (from.length() > 0) { + try { + start = Double.parseDouble(from); + } + catch (NumberFormatException nfe) { + log.warn("Invalid from value: " + from); + } + } + + if (to.length() > 0) { + try { + end = Double.parseDouble(to); + } + catch (NumberFormatException nfe) { + log.warn("Invalid to value: " + to); + } + } + + if (start > end) { + double t = start; + start = end; + end = t; + } + + return new Range(start, end); + } + + protected Filter buildFilter() { + NodeList filters = document.getElementsByTagName("filter"); + + return filters.getLength() < 1 + ? FixingsOverview.ACCEPT + : buildFilter((Element)filters.item(0)); + } + + protected static Filter buildFilter(Element root) { + List<Filter> filters = buildRecursiveFilter(root); + switch (filters.size()) { + case 0: return FixingsOverview.ACCEPT; + case 1: return filters.get(0); + default: return new AndFilter(filters); + } + } + + protected static final Date parseDate(String text) { + SimpleDateFormat format = + new SimpleDateFormat(FixingsOverview.DATE_FORMAT); + return format.parse(text, new ParsePosition(0)); + } + + protected static List<Filter> buildRecursiveFilter(Element root) { + List<Filter> filters = new ArrayList<Filter>(); + + NodeList children = root.getChildNodes(); + + for (int i = 0, N = children.getLength(); i < N; ++i) { + Node child = children.item(i); + if (child.getNodeType() != Node.ELEMENT_NODE) { + continue; + } + + Element element = (Element)child; + String name = element.getLocalName(); + + if ("and".equals(name)) { + filters.add(new AndFilter(buildRecursiveFilter(element))); + } + else if ("or".equals(name)) { + filters.add(new OrFilter(buildRecursiveFilter(element))); + } + else if ("not".equals(name)) { + List<Filter> childrenFilters = buildRecursiveFilter(element); + if (!childrenFilters.isEmpty()) { + filters.add(new NotFilter(childrenFilters.get(0))); + } + } + else if ("column".equals(name)) { + String cid = element.getAttribute("cid").trim(); + if (cid.length() > 0) { + try { + filters.add(new IdFilter(Integer.parseInt(cid))); + } + catch (NumberFormatException nfe) { + log.warn(nfe); + } + } + } + else if ("date".equals(name)) { + String when = element.getAttribute("when").trim(); + if (when.length() > 0) { + Date date = parseDate(when); + if (date != null) { + filters.add(new DateFilter(date)); + } + } + } + else if ("date-range".equals(name)) { + String from = element.getAttribute("from").trim(); + String to = element.getAttribute("to" ).trim(); + if (from.length() > 0 && to.length() > 0) { + Date start = parseDate(from); + Date end = parseDate(to); + if (start != null && end != null) { + filters.add(new DateRangeFilter(start, end)); + } + } + } + else if ("sector-range".equals(name)) { + String from = element.getAttribute("from").trim(); + String to = element.getAttribute("to" ).trim(); + if (from.length() > 0 && to.length() > 0) { + try { + filters.add(new SectorRangeFilter( + Integer.parseInt(from), + Integer.parseInt(to))); + } + catch (NumberFormatException nfe) { + log.warn(nfe); + } + } + } + } + + return filters; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :