christian@5022: package de.intevation.flys.mapserver;
christian@5022: 
christian@5022: import de.intevation.artifacts.common.utils.Config;
christian@5022: import de.intevation.flys.artifacts.model.LayerInfo;
christian@5022: import de.intevation.flys.utils.FLYSUtils;
christian@5022: 
christian@5022: import java.io.File;
christian@5022: import java.io.FileNotFoundException;
christian@5022: import java.io.FileWriter;
christian@5022: import java.io.FilenameFilter;
christian@5022: import java.io.IOException;
christian@5022: import java.io.Writer;
christian@5022: import java.util.ArrayList;
christian@5022: import java.util.Date;
christian@5022: import java.util.List;
christian@5022: 
christian@5022: import org.apache.log4j.Logger;
christian@5022: import org.apache.velocity.Template;
christian@5022: import org.apache.velocity.VelocityContext;
christian@5022: import org.apache.velocity.app.VelocityEngine;
christian@5022: import org.apache.velocity.runtime.RuntimeConstants;
christian@5022: 
christian@5022: /**
christian@5022:  * This class iterates over a bunch of directories, searches for meta
christian@5022:  * information coresponding to shapefiles and creates a mapfile which is used by
christian@5022:  * a <i>MapServer</i>.
christian@5022:  *
christian@5022:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
christian@5022:  */
christian@5022: public abstract class MapfileGenerator
christian@5022: {
christian@5022:     public static final String WSPLGEN_RESULT_SHAPE   = "wsplgen.shp";
christian@5022:     public static final String WSPLGEN_LINES_SHAPE    = "barrier_lines.shp";
christian@5022:     public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp";
christian@5022:     public static final String WSPLGEN_USER_SHAPE     = "user-rgd.shp";
christian@5022: 
christian@5022:     public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm";
christian@5022:     public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm";
christian@5022:     public static final String DB_LAYER_TEMPLATE  = "db_layer.vm";
christian@5022:     public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm";
christian@5022: 
christian@5023:     public static final String MS_PREFIX_WSPLGEN   = "wsplgen-";
christian@5023:     public static final String MS_PREFIX_BARRIERS  = "barriers-";
christian@5023:  //   public static final String MS_LINE_PREFIX      = "lines-";
christian@5023:  //   public static final String MS_POLYGONS_PREFIX  = "polygons-";
christian@5023: //    public static final String MS_LAYER_PREFIX     = "ms_layer-";
christian@5023:     public static final String MS_PREFIX_USER = "user-";
christian@5022: 
christian@5022:     private static Logger logger = Logger.getLogger(MapfileGenerator.class);
christian@5022: 
christian@5022:     private File shapefileDirectory;
christian@5022: 
christian@5022:     private VelocityEngine velocityEngine;
christian@5022: 
christian@5022: 
christian@5022:     protected MapfileGenerator() {
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Method to check the existance of a template file.
christian@5022:      *
christian@5022:      * @param templateID The name of a template.
christian@5022:      * @return true, of the template exists - otherwise false.
christian@5022:      */
christian@5023:     protected boolean templateExists(String templateID){
christian@5022:         Template template = getTemplateByName(templateID);
christian@5022:         return template != null;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5023:     /**
christian@5023:      * Starts the mapfile generation. This is the main entry point for
christian@5023:      * the mapfile generation, all other methods of this class/package
christian@5023:      * *should* be non-public.
christian@5023:      * @throws Exception
christian@5023:      */
christian@5022:     public abstract void generate() throws Exception;
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Returns the VelocityEngine used for the template mechanism.
christian@5022:      *
christian@5022:      * @return the velocity engine.
christian@5022:      */
christian@5022:     protected VelocityEngine getVelocityEngine() {
christian@5022:         if (velocityEngine == null) {
christian@5022:             velocityEngine = new VelocityEngine();
christian@5022:             try {
christian@5022:                 setupVelocity(velocityEngine);
christian@5022:             }
christian@5022:             catch (Exception e) {
christian@5022:                 logger.error(e, e);
christian@5022:                 return null;
christian@5022:             }
christian@5022:         }
christian@5022:         return velocityEngine;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Initialize velocity.
christian@5022:      *
christian@5022:      * @param engine Velocity engine.
christian@5022:      * @throws Exception if an error occured while initializing velocity.
christian@5022:      */
christian@5022:     protected void setupVelocity(VelocityEngine engine)
christian@5022:     throws Exception
christian@5022:     {
christian@5022:         engine.setProperty(
christian@5022:             "input.encoding",
christian@5022:             "UTF-8");
christian@5022: 
christian@5022:         engine.setProperty(
christian@5022:             RuntimeConstants.RUNTIME_LOG,
christian@5022:             getVelocityLogfile());
christian@5022: 
christian@5022:         engine.setProperty(
christian@5022:             "resource.loader",
christian@5022:             "file");
christian@5022: 
christian@5022:         engine.setProperty(
christian@5022:             "file.resource.loader.path",
christian@5022:             getMapserverTemplatePath());
christian@5022: 
christian@5022:         engine.init();
christian@5022:     }
christian@5022: 
christian@5022:     protected abstract String getVelocityLogfile();
christian@5022: 
christian@5022:     protected abstract String getMapserverTemplatePath();
christian@5022: 
christian@5022:     protected abstract String getMapserverUrl();
christian@5022: 
christian@5022:     protected VelocityContext getVelocityContext() {
christian@5022:         VelocityContext context = new VelocityContext();
christian@5022: 
christian@5022:         try {
christian@5022:             context.put("MAPSERVERURL",
christian@5022:                 getMapserverUrl());
christian@5022:             context.put("SHAPEFILEPATH",
christian@5022:                 getShapefileBaseDir().getCanonicalPath());
christian@5022:             context.put("CONFIGDIR",
christian@5022:                 Config.getConfigDirectory().getCanonicalPath());
christian@5022:         }
christian@5022:         catch (FileNotFoundException fnfe) {
christian@5022:             // this is bad
christian@5022:             logger.warn(fnfe, fnfe);
christian@5022:         }
christian@5022:         catch (IOException ioe) {
christian@5022:             // this is also bad
christian@5022:             logger.warn(ioe, ioe);
christian@5022:         }
christian@5022: 
christian@5022:         return context;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Returns a template specified by <i>model</i>.
christian@5022:      *
christian@5022:      * @param model The name of the template.
christian@5022:      * @return a template.
christian@5022:      */
christian@5022:     protected Template getTemplateByName(String model) {
christian@5022:         if (model.indexOf(".vm") < 0) {
christian@5022:             model = model.concat(".vm");
christian@5022:         }
christian@5022: 
christian@5022:         try {
christian@5022:             VelocityEngine engine = getVelocityEngine();
christian@5022:             if (engine == null) {
christian@5022:                 logger.error("Error while fetching VelocityEngine.");
christian@5022:                 return null;
christian@5022:             }
christian@5022: 
christian@5022:             return engine.getTemplate(model);
christian@5022:         }
christian@5022:         catch (Exception e) {
christian@5022:             logger.warn(e, e);
christian@5022:         }
christian@5022: 
christian@5022:         return null;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Returns the mapfile  template.
christian@5022:      *
christian@5022:      * @return the mapfile template.
christian@5022:      * @throws Exception if an error occured while reading the configuration.
christian@5022:      */
christian@5022:     protected Template getMapfileTemplateObj()
christian@5022:     throws Exception
christian@5022:     {
christian@5022:         String mapfileName = getMapfileTemplate();
christian@5022:         return getTemplateByName(mapfileName);
christian@5022:     }
christian@5022: 
christian@5022:     protected abstract String getMapfilePath();
christian@5022: 
christian@5022:     protected abstract String getMapfileTemplate();
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Returns the base directory storing the shapefiles.
christian@5022:      *
christian@5022:      * @return the shapefile base directory.
christian@5022:      *
christian@5022:      * @throws FileNotFoundException if no shapefile path is found or
christian@5022:      * configured.
christian@5022:      */
christian@5022:     public File getShapefileBaseDir()
christian@5022:             throws FileNotFoundException, IOException
christian@5022:     {
christian@5022:         if (shapefileDirectory == null) {
christian@5022:             String path = FLYSUtils.getXPathString(
christian@5022:                 FLYSUtils.XPATH_FLOODMAP_SHAPEFILE_DIR);
christian@5022: 
christian@5022:             if (path != null) {
christian@5022:                 shapefileDirectory = new File(path);
christian@5022:             }
christian@5022: 
christian@5022:             if (shapefileDirectory == null) {
christian@5022:                 throw new FileNotFoundException("No shapefile directory given");
christian@5022:             }
christian@5022: 
christian@5022:             if (!shapefileDirectory.exists()) {
christian@5022:                 shapefileDirectory.mkdirs();
christian@5022:             }
christian@5022:         }
christian@5022: 
christian@5022:         return shapefileDirectory;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5023:     protected File[] getProjectDirs()
christian@5022:             throws FileNotFoundException, IOException
christian@5022:     {
christian@5022:         File   baseDir      = getShapefileBaseDir();
christian@5022:         File[] artifactDirs = baseDir.listFiles();
christian@5022: 
christian@5022:         return artifactDirs;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5023:     /**
christian@5023:      * Search in all given directories for shapefiles that can be used
christian@5023:      * as barrier, user oder wsplgen layers.
christian@5023:      * @param dirs
christian@5023:      * @return
christian@5023:      */
christian@5023:     protected List<File> searchForLayerShapes(File[] dirs) {
christian@5023:         List<File> shapes = new ArrayList<File>();
christian@5022: 
christian@5022:         for (File dir: dirs) {
christian@5022:             File[] layerFiles = dir.listFiles(new FilenameFilter() {
christian@5022:                 @Override
christian@5022:                 public boolean accept(File directory, String name) {
christian@5023:                     return name.startsWith(MS_PREFIX_BARRIERS) ||
christian@5023:                            name.startsWith(MS_PREFIX_USER) ||
christian@5023:                            name.startsWith(MS_PREFIX_WSPLGEN);
christian@5022:                 }
christian@5022:             });
christian@5022: 
christian@5022:             for (File layer: layerFiles) {
christian@5023:                 shapes.add(layer);
christian@5022:             }
christian@5022:         }
christian@5022: 
christian@5023:         return shapes;
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Creates a layer snippet which might be included in the mapfile.
christian@5022:      *
christian@5022:      * @param layerinfo A LayerInfo object that contains all necessary
christian@5022:      * information to build a Mapserver LAYER section.
christian@5022:      * @param dir The base dir for the LAYER snippet.
christian@5022:      * @param filename The name of the file that is written.
christian@5022:      * @param tpl The Velocity template which is used to create the LAYER
christian@5022:      * section.
christian@5022:      */
christian@5022:     protected void writeLayer(
christian@5022:         LayerInfo layerInfo,
christian@5022:         File      layerFile,
christian@5022:         Template  tpl
christian@5022:     )
christian@5022:     throws    FileNotFoundException
christian@5022:     {
christian@5022:         if (logger.isDebugEnabled()) {
christian@5022:             logger.debug("Write layer for:");
christian@5022:             logger.debug("   directory/file: " + layerFile.getName());
christian@5022:         }
christian@5022: 
christian@5022:         Writer writer = null;
christian@5022: 
christian@5022:         try {
christian@5022:             writer = new FileWriter(layerFile);
christian@5022: 
christian@5022:             VelocityContext context = getVelocityContext();
christian@5022:             context.put("LAYER", layerInfo);
christian@5022: 
christian@5022:             tpl.merge(context, writer);
christian@5022:         }
christian@5022:         catch (FileNotFoundException fnfe) {
christian@5022:             logger.error(fnfe, fnfe);
christian@5022:         }
christian@5022:         catch (IOException ioe) {
christian@5022:             logger.error(ioe, ioe);
christian@5022:         }
christian@5022:         catch (Exception e) {
christian@5022:             logger.error(e, e);
christian@5022:         }
christian@5022:         finally {
christian@5022:             try {
christian@5022:                 if (writer != null) {
christian@5022:                     writer.close();
christian@5022:                 }
christian@5022:             }
christian@5022:             catch (IOException ioe) {
christian@5022:                 logger.debug(ioe, ioe);
christian@5022:             }
christian@5022:         }
christian@5022:     }
christian@5022: 
christian@5022: 
christian@5022:     /**
christian@5022:      * Creates a mapfile with the layer information stored in <i>layers</i>.
christian@5022:      *
christian@5022:      * @param layers Layer information.
christian@5022:      */
christian@5022:     protected void writeMapfile(List<String> layers) {
christian@5022:         String tmpMapName = "mapfile" + new Date().getTime();
christian@5022: 
christian@5022:         File mapfile = new File(getMapfilePath());
christian@5022: 
christian@5022:         File   tmp     = null;
christian@5022:         Writer writer  = null;
christian@5022: 
christian@5022:         try {
christian@5022:             tmp = new File(mapfile.getParent(), tmpMapName);
christian@5022:             tmp.createNewFile();
christian@5022: 
christian@5022:             writer = new FileWriter(tmp);
christian@5022: 
christian@5022:             VelocityContext context = getVelocityContext();
christian@5022:             context.put("LAYERS", layers);
christian@5022: 
christian@5022:             Template mapTemplate = getMapfileTemplateObj();
christian@5022:             if (mapTemplate == null) {
christian@5022:                 logger.warn("No mapfile template found.");
christian@5022:                 return;
christian@5022:             }
christian@5022: 
christian@5022:             mapTemplate.merge(context, writer);
christian@5022: 
christian@5022:             // we need to create a temporary mapfile first und rename it into
christian@5022:             // real mapfile because we don't run into race conditions on this
christian@5022:             // way. (iw)
christian@5022:             tmp.renameTo(mapfile);
christian@5022:         }
christian@5022:         catch (FileNotFoundException fnfe) {
christian@5022:             logger.error(fnfe, fnfe);
christian@5022:         }
christian@5022:         catch (IOException ioe) {
christian@5022:             logger.error(ioe, ioe);
christian@5022:         }
christian@5022:         catch (Exception e) {
christian@5022:             logger.error(e, e);
christian@5022:         }
christian@5022:         finally {
christian@5022:             try {
christian@5022:                 if (writer != null) {
christian@5022:                     writer.close();
christian@5022:                 }
christian@5022: 
christian@5022:                 if (tmp.exists()) {
christian@5022:                     tmp.delete();
christian@5022:                 }
christian@5022:             }
christian@5022:             catch (IOException ioe) {
christian@5022:                 logger.debug(ioe, ioe);
christian@5022:             }
christian@5022:         }
christian@5022:     }
christian@5022: }
christian@5022: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :