ingo@106: package de.intevation.flys.artifacts.context;
ingo@106:
ingo@106: import java.io.File;
ingo@106: import java.util.ArrayList;
ingo@106: import java.util.List;
ingo@106:
ingo@106: import javax.xml.xpath.XPathConstants;
ingo@106:
ingo@106: import org.apache.log4j.Logger;
ingo@106:
ingo@106: import org.w3c.dom.Document;
ingo@106: import org.w3c.dom.Element;
ingo@106: import org.w3c.dom.NodeList;
ingo@106:
ingo@106: import de.intevation.artifacts.ArtifactContextFactory;
ingo@106:
ingo@106: import de.intevation.artifacts.common.utils.XMLUtils;
sascha@130: import de.intevation.artifacts.common.utils.Config;
ingo@106:
ingo@107: import de.intevation.artifactdatabase.state.State;
ingo@107: import de.intevation.artifactdatabase.state.StateEngine;
ingo@107: import de.intevation.artifactdatabase.transition.Transition;
ingo@107: import de.intevation.artifactdatabase.transition.TransitionEngine;
ingo@106:
ingo@107: import de.intevation.flys.artifacts.states.StateFactory;
ingo@106: import de.intevation.flys.artifacts.transitions.TransitionFactory;
ingo@106:
ingo@106:
ingo@106: /**
ingo@106: * The ArtifactContextFactory is used to initialize basic components and put
ingo@106: * them into the global context of the application.
ingo@106: *
ingo@106: * @author Ingo Weinzierl
ingo@106: */
ingo@106: public class FLYSContextFactory implements ArtifactContextFactory {
ingo@106:
ingo@106: /** The logger that is used in this class */
ingo@106: private static Logger logger = Logger.getLogger(FLYSContextFactory.class);
ingo@106:
ingo@106: /** The XPath to the artifacts configured in the configuration. */
ingo@106: public static final String XPATH_ARTIFACTS =
ingo@106: "/artifact-database/artifacts/artifact";
ingo@106:
ingo@106: /** The XPath to the name of the artifact. */
ingo@107: public static final String XPATH_ARTIFACT_NAME = "/artifact/@name";
ingo@106:
ingo@106: /** The XPath to the xlink ref in an artifact configuration. */
ingo@106: public static final String XPATH_XLINK = "xlink:href";
ingo@106:
ingo@106: /** The XPath to the transitions configured in the artifact config. */
ingo@106: public static final String XPATH_TRANSITIONS =
ingo@106: "/artifact/states/transition";
ingo@106:
ingo@107: /** The XPath to the states configured in the artifact config. */
ingo@107: public static final String XPATH_STATES =
ingo@107: "/artifact/states/state";
ingo@107:
ingo@106: /**
ingo@106: * Creates a new FLYSArtifactContext object and initialize all
ingo@106: * components required by the application.
ingo@106: *
ingo@106: * @param config The artifact server configuration.
ingo@106: * @return a FLYSArtifactContext.
ingo@106: */
ingo@106: public Object createArtifactContext(Document config) {
ingo@106: FLYSContext context = new FLYSContext(config);
ingo@106:
ingo@106: configureTransitions(config, context);
ingo@107: configureStates(config, context);
ingo@106:
ingo@106: return context;
ingo@106: }
ingo@106:
ingo@106:
ingo@106: /**
ingo@106: * This method initializes the transition configuration.
ingo@106: *
ingo@106: * @param config the config document.
ingo@106: * @param context the FLYSContext.
ingo@106: */
ingo@106: protected void configureTransitions(Document config, FLYSContext context) {
ingo@106: TransitionEngine engine = new TransitionEngine();
ingo@106:
ingo@106: Document[] artifacts = getArtifactConfigurations(config);
ingo@106: logger.info("Found " + artifacts.length + " artifacts in the config.");
ingo@106:
ingo@106: for (Document doc: artifacts) {
ingo@106: List transitions = new ArrayList();
ingo@106:
ingo@106: String artName = (String) XMLUtils.xpath(
ingo@106: doc, XPATH_ARTIFACT_NAME, XPathConstants.STRING);
ingo@106:
ingo@111: NodeList list = (NodeList) XMLUtils.xpath(
ingo@106: doc, XPATH_TRANSITIONS, XPathConstants.NODESET);
ingo@106:
ingo@111: if (list == null) {
ingo@106: logger.warn("The artifact has no transitions configured.");
ingo@107: continue;
ingo@106: }
ingo@106:
ingo@111: int trans = list.getLength();
ingo@106:
ingo@106: logger.info(
ingo@106: "Artifact '" + artName + "' has " + trans + " transitions.");
ingo@106:
ingo@106: for (int i = 0; i < trans; i++) {
ingo@111: Transition t = TransitionFactory.createTransition(list.item(i));
ingo@111: String s = t.getFrom();
ingo@111: engine.addTransition(s, t);
ingo@106: }
ingo@106: }
ingo@106:
ingo@106: context.put(FLYSContext.TRANSITION_ENGINE_KEY, engine);
ingo@106: }
ingo@106:
ingo@106:
ingo@106: /**
ingo@106: * This method returns all artifact documents defined in
ingo@106: * config
.
NOTE: The artifact configurations need to be
ingo@106: * stored in own files referenced by an xlink.
ingo@106: *
ingo@106: * @param config The global configuration.
ingo@106: *
ingo@106: * @return an array of Artifact configurations.
ingo@106: */
ingo@106: protected Document[] getArtifactConfigurations(Document config) {
ingo@106: NodeList artifacts = (NodeList) XMLUtils.xpath(
ingo@106: config, XPATH_ARTIFACTS, XPathConstants.NODESET);
ingo@106:
ingo@106: int count = artifacts.getLength();
ingo@106:
ingo@106: Document[] artifactDocs = new Document[count];
ingo@106:
ingo@106: for (int i = 0; i < count; i++) {
ingo@106: Element tmp = (Element) artifacts.item(i);
ingo@106:
ingo@106: String xlink = tmp.getAttribute(XPATH_XLINK);
ingo@106: xlink = Config.replaceConfigDir(xlink);
ingo@106:
ingo@106: File artifactFile = new File(xlink);
ingo@106: artifactDocs[i] = XMLUtils.parseDocument(artifactFile);
ingo@106: }
ingo@106:
ingo@106: return artifactDocs;
ingo@106: }
ingo@107:
ingo@107:
ingo@107: /**
ingo@107: * This method initializes the transition configuration.
ingo@107: *
ingo@107: * @param config the config document.
ingo@107: * @param context the FLYSContext.
ingo@107: */
ingo@107: protected void configureStates(Document config, FLYSContext context) {
ingo@107: StateEngine engine = new StateEngine();
ingo@107:
ingo@107: Document[] artifacts = getArtifactConfigurations(config);
ingo@107: logger.info("Found " + artifacts.length + " artifacts in the config.");
ingo@107:
ingo@107: for (Document doc: artifacts) {
ingo@107: List states = new ArrayList();
ingo@107:
ingo@107: String artName = (String) XMLUtils.xpath(
ingo@107: doc, XPATH_ARTIFACT_NAME, XPathConstants.STRING);
ingo@107:
ingo@107: NodeList stateList = (NodeList) XMLUtils.xpath(
ingo@107: doc, XPATH_STATES, XPathConstants.NODESET);
ingo@107:
ingo@107: if (stateList == null) {
ingo@107: logger.warn("The artifact has no states configured.");
ingo@107: continue;
ingo@107: }
ingo@107:
ingo@107: int count = stateList.getLength();
ingo@107:
ingo@107: logger.info(
ingo@107: "Artifact '" + artName + "' has " + count + " states.");
ingo@107:
ingo@107: for (int i = 0; i < count; i++) {
ingo@107: states.add(StateFactory.createState(
ingo@107: stateList.item(i)));
ingo@107: }
ingo@107:
ingo@107: engine.addStates(artName, states);
ingo@107: }
ingo@107:
ingo@107: context.put(FLYSContext.STATE_ENGINE_KEY, engine);
ingo@107: }
ingo@106: }
ingo@106: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :