Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java @ 372:fc3cf0ef777e
Added meta data service.
flys-artifacts/trunk@1781 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 29 Apr 2011 15:10:44 +0000 |
parents | |
children | df02137b3b28 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java Fri Apr 29 15:10:44 2011 +0000 @@ -0,0 +1,260 @@ +package de.intevation.flys.artifacts.services.meta; + +import java.util.regex.Matcher; + +import java.util.ArrayList; +import java.util.List; +import java.util.HashMap; +import java.util.Map; + +import org.w3c.dom.Document; +import org.w3c.dom.NodeList; +import org.w3c.dom.Node; +import org.w3c.dom.Element; + +import java.sql.SQLException; +import java.sql.Connection; + +import de.intevation.artifacts.common.utils.XMLUtils; + +import org.apache.log4j.Logger; + +public class Builder +{ + private static Logger log = Logger.getLogger(Builder.class); + + public static final String DC_NAMESPACE_URI = + "http://www.intevation.org/2011/Datacage"; + + protected Document template; + + public class BuildHelper + { + protected Document output; + protected StackFrames frames; + protected Connection connection; + protected Map<String, CompiledStatement> statements; + + public BuildHelper() { + frames = new StackFrames(); + statements = new HashMap<String, CompiledStatement>(); + } + + public BuildHelper(Document output, Connection connection) { + this(); + this.output = output; + this.connection = connection; + } + + public void build(List<Node> elements) throws SQLException { + try { + for (Node current: elements) { + build(output, current); + } + } + finally { + for (CompiledStatement cs: statements.values()) { + cs.close(); + } + statements.clear(); + } + } + + protected void context(Node parent, Element current) + throws SQLException + { + NodeList elements = current.getElementsByTagNameNS( + DC_NAMESPACE_URI, "elements"); + + if (elements.getLength() < 1) { + log.warn("no elements found -> ignore"); + return; + } + + NodeList subs = elements.item(0).getChildNodes(); + int S = subs.getLength(); + + if (S < 1) { + log.warn("elements is empty -> ignore"); + return; + } + + NodeList stmntNode = current.getElementsByTagNameNS( + DC_NAMESPACE_URI, "statement"); + + if (stmntNode.getLength() < 1) { + log.warn("dc:context: too less statements"); + return; + } + + String stmntText = stmntNode.item(0).getTextContent(); + + if (stmntText == null) { + log.warn("dc:context: no sql statement found"); + } + + CompiledStatement cs = statements.get(stmntText); + + if (cs == null) { + cs = new CompiledStatement(stmntText); + statements.put(stmntText, cs); + } + + ResultData rd = cs.execute(connection, frames); + + String [] columns = rd.getColumnLabels(); + + + for (Object [] row: rd.getRows()) { + frames.enter(); + try { + frames.put(columns, row); + for (int i = 0; i < S; ++i) { + build(parent, subs.item(i)); + } + } + finally { + frames.leave(); + } + } + } + + protected void element(Node parent, Element current) + throws SQLException + { + String attr = expand(current.getAttribute("name")); + + if (log.isDebugEnabled()) { + log.debug("dc:element -> '" + attr + "'"); + } + + if (attr.length() == 0) { + log.warn("no name attribute found"); + return; + } + + Element element = output.createElement(attr); + + NodeList children = current.getChildNodes(); + for (int i = 0, N = children.getLength(); i < N; ++i) { + build(element, children.item(i)); + } + + parent.appendChild(element); + } + + protected void text(Node parent, Element current) + throws SQLException + { + log.debug("dc:text"); + String value = expand(current.getTextContent()); + parent.appendChild(output.createTextNode(value)); + } + + + protected void attribute(Node parent, Element current) { + + if (parent.getNodeType() != Node.ELEMENT_NODE) { + log.warn("need element here"); + return; + } + + String name = expand(current.getAttribute("name")); + String value = expand(current.getAttribute("value")); + + Element element = (Element)parent; + + element.setAttribute(name, value); + } + + protected String expand(String s) { + Matcher m = CompiledStatement.VAR.matcher(s); + + StringBuffer sb = new StringBuffer(); + while (m.find()) { + String key = m.group(1); + Object value = frames.get(key); + m.appendReplacement(sb, value != null ? value.toString() : ""); + } + m.appendTail(sb); + return sb.toString(); + } + + protected void build(Node parent, Node current) + throws SQLException + { + String ns = current.getNamespaceURI(); + if (ns != null && ns.equals(DC_NAMESPACE_URI)) { + if (current.getNodeType() != Node.ELEMENT_NODE) { + log.warn("need elements here"); + } + else { + String localName = current.getLocalName(); + if ("context".equals(localName)) { + context(parent, (Element)current); + } + else if ("attribute".equals(localName)) { + attribute(parent, (Element)current); + } + else if ("element".equals(localName)) { + element(parent, (Element)current); + } + else if ("text".equals(localName)) { + text(parent, (Element)current); + } + else { + log.warn("unknown '" + localName + "' -> ignore"); + } + } + return; + } + + Node copy = output.importNode(current, false); + + NodeList children = current.getChildNodes(); + for (int i = 0, N = children.getLength(); i < N; ++i) { + build(copy, children.item(i)); + } + parent.appendChild(copy); + } + } // class BuildHelper + + + public Builder() { + } + + public Builder(Document template) { + this.template = template; + } + + public Document build(Connection connection) + throws SQLException + { + return build(connection, XMLUtils.newDocument()); + } + + public Document build(Connection connection, Document output) + throws SQLException + { + NodeList roots = template.getElementsByTagNameNS( + DC_NAMESPACE_URI, "template"); + + BuildHelper helper = new BuildHelper(output, connection); + + List<Node> elements = new ArrayList<Node>(); + + for (int i = 0, N = roots.getLength(); i < N; ++i) { + NodeList rootChildren = roots.item(i).getChildNodes(); + for (int j = 0, M = rootChildren.getLength(); j < M; ++j) { + Node child = rootChildren.item(j); + if (child.getNodeType() == Node.ELEMENT_NODE) { + elements.add(child); + } + } + } + helper.build(elements); + + return output; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :