/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.geoserver.template;
import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.FileTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.template.Configuration;
import org.opengis.feature.simple.SimpleFeatureType;
import org.geoserver.catalog.Catalog;
import org.geoserver.catalog.CoverageInfo;
import org.geoserver.catalog.FeatureTypeInfo;
import org.geoserver.catalog.NamespaceInfo;
import org.geoserver.catalog.ResourceInfo;
import org.geoserver.config.GeoServerDataDirectory;
import org.geoserver.platform.GeoServerExtensions;
import org.geoserver.platform.GeoServerResourceLoader;
import org.vfny.geoserver.global.GeoserverDataDirectory;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.util.NoSuchElementException;
import java.util.logging.Logger;
/**
* A freemarker template loader which can load templates from locations under
* a GeoServer data directory.
* <p>
* To use this template loader, use the {@link Configuration#setTemplateLoader(TemplateLoader)}
* method:
* <pre>
* <code>
* Configuration cfg = new Configuration();
* cfg.setTemplateLoader( new GeoServerTemplateLoader() );
* ...
* Template template = cfg.getTemplate( "foo.ftl" );
* ...
* </code>
* </pre>
* </p>
* <p>
* In {@link #findTemplateSource(String)}, the following lookup heuristic is
* applied to locate a file based on the given path.
* <ol>
* <li>The path relative to '<data_dir>/featureTypes/[featureType]'
* given that a feature ( {@link #setFeatureType(String)} ) has been set
* <li>The path relative to '<data_dir>/featureTypes'
* <li>The path relative to '<data_dir>/templates'
* <li>The path relative to the calling class with {@link Class#getResource(String)}.
* </ol>
* <b>Note:</b> If method 5 succeeds, the resulting template will be copied to
* the 'templates' directory of the data directory.
* </p>
*
* @author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org
*
*/
public class GeoServerTemplateLoader implements TemplateLoader {
/** logger */
static Logger LOGGER = org.geotools.util.logging.Logging.getLogger("org.geoserver.template");
/**
* Delegate file based template loader
*/
FileTemplateLoader fileTemplateLoader;
/**
* Delegate class based template loader, may be null depending on how
*/
ClassTemplateLoader classTemplateLoader;
/**
* GeoServer data directory
*/
GeoServerDataDirectory dd;
/**
* Feature type directory to load template against. Its presence is mutually
* exclusive with coverageName
* @deprecated Keeping this around for backwards compatability
*/
ResourceInfo resource;
/**
* Feature type directory to load template against. Its presence is mutually
* exclusive with coverageName
* @deprecated Keeping this around for backwards compatability
*/
SimpleFeatureType featureType;
/**
* Coverage info directory to load template against. Its presence is mutually
* exclusive with featureTypeInfo
*/
private String coverageName;
/**
* Reference to the GeoServer catalog so we can look up the prefix for a namespace.
*/
private Catalog catalog;
/**
* Constructs the template loader.
*
* @param caller The "calling" class, used to look up templates based with
* {@link Class#getResource(String)}, may be <code>null</code>
*
* @deprecated Use {@link #GeoServerTemplateLoader(Class, GeoServerResourceLoader)}
* @throws IOException
*/
public GeoServerTemplateLoader(Class caller) throws IOException {
this(caller,GeoServerExtensions.bean(GeoServerResourceLoader.class));
}
/**
* Constructs the template loader.
*
* @param caller The "calling" class, used to look up templates based with
* {@link Class#getResource(String)}, may be <code>null</code>
* @param rl The geoserver resource loader
*
* @throws IOException
*/
public GeoServerTemplateLoader(Class caller, GeoServerResourceLoader rl) throws IOException {
//create a file template loader to delegate to
fileTemplateLoader = new FileTemplateLoader(rl.getBaseDirectory());
//grab the catalog and store a reference
catalog = (Catalog)GeoServerExtensions.bean("catalog");
//create a class template loader to delegate to
if (caller != null) {
classTemplateLoader = new ClassTemplateLoader(caller, "");
}
dd = new GeoServerDataDirectory(rl);
}
/**
* Sets the feature type in which templates are loaded against.
* @deprecated use {@link #setFeatureType(FeatureTypeInfo)}
*/
public void setFeatureType(SimpleFeatureType featureType) {
this.featureType = featureType;
FeatureTypeInfo ft = catalog.getFeatureTypeByName( featureType.getName() );
if ( ft == null ) {
return;
//throw new IllegalArgumentException("No feature type named " + featureType.getName() + " in catalog");
}
setFeatureType(ft);
}
public void setFeatureType(FeatureTypeInfo ft) {
this.resource = ft;
}
/**
* Sets the coverage info
* @deprecated use {@link #setCoverage(CoverageInfo)}
*/
public void setCoverageName(String coverageName){
this.coverageName = coverageName;
CoverageInfo c = catalog.getCoverageByName( coverageName );
if ( c == null ) {
return;
//throw new IllegalArgumentException("No coverage named " + coverageName + " in catalog");
}
setCoverage(c);
}
public void setCoverage(CoverageInfo c) {
this.resource = c;
}
public Object findTemplateSource(String path) throws IOException {
File template = null;
//template look up order
// 1. Relative to resource
// 2. Relative to store of the resource
// 3. Relative to workspace of resource
// 4. Relative to templates directory
// 5. Relative to the class
if ( resource != null ) {
//first check relative to set resource
template = dd.findSuppResourceFile( resource, path);
if ( template == null ) {
//next try relative to the store
template = dd.findSuppStoreFile( resource.getStore(), path);
}
if ( template == null ) {
//next try relative to the workspace
template = dd.findSuppWorkspaceFile( resource.getStore().getWorkspace(), path);
}
if ( template != null ) {
return template;
}
}
//for backwards compatability, use the old lookup mechanism
template = findTemplateSourceLegacy(path);
if ( template != null ) {
return template;
}
//next, check the templates directory
template = (File) fileTemplateLoader.findTemplateSource("templates" + File.separator + path);
if (template != null) {
return template;
}
//final effort to use a class resource
if (classTemplateLoader != null) {
Object source = classTemplateLoader.findTemplateSource(path);
//wrap the source in a source that maintains the orignial path
if (source != null) {
return new ClassTemplateSource(path, source);
}
}
return null;
}
File findTemplateSourceLegacy(String path) throws IOException {
File template = null;
//first check relative to set feature type
String baseDirName;
try {
final String dirName;
if (featureType != null) {
baseDirName = "featureTypes";
dirName = GeoserverDataDirectory.findFeatureTypeDirName(featureType);
} else if (coverageName != null) {
baseDirName = "coverages";
dirName = GeoserverDataDirectory.findCoverageDirName(coverageName);
} else {
baseDirName = "featureTypes";
dirName = "";
}
template = (File) fileTemplateLoader.findTemplateSource(baseDirName + File.separator
+ dirName + File.separator + path);
if (template != null) {
return template;
}
if (featureType != null) {
NamespaceInfo nsInfo = null;
if ( featureType.getName().getNamespaceURI() != null ) {
nsInfo = catalog.getNamespaceByURI(featureType.getName().getNamespaceURI());
}
// the feature type might not be registered, it may come from WMS feature portrayal, be a
// remote one
if(nsInfo != null) {
//try looking up the template in the default location for the particular namespaces
// under templates/<namespace>
template = (File) fileTemplateLoader.findTemplateSource(
"templates" + File.separator + nsInfo.getPrefix() + File.separator + path
);
}
}
if (template != null) return template;
// next, try relative to featureTypes or coverages directory, as appropriate
template = (File) fileTemplateLoader.findTemplateSource(baseDirName + File.separator
+ path);
if (template != null) {
return template;
}
} catch(NoSuchElementException e) {
// this one is thrown if the feature type is not found, and happens whenever
// the feature type is a remote one
// No problem, we just go on, there won't be any specific template for it
}
return null;
}
public long getLastModified(Object source) {
if (source instanceof File) {
//loaded from file
return fileTemplateLoader.getLastModified(source);
} else {
//loaded from class
ClassTemplateSource wrapper = (ClassTemplateSource) source;
return classTemplateLoader.getLastModified(wrapper.source);
}
}
public Reader getReader(Object source, String encoding)
throws IOException {
if (source instanceof File) {
// loaded from file
return fileTemplateLoader.getReader(source, encoding);
} else {
// get teh resource for the raw source as use it right away
ClassTemplateSource wrapper = (ClassTemplateSource) source;
return classTemplateLoader.getReader(wrapper.source, encoding);
}
}
public void closeTemplateSource(Object source) throws IOException {
if (source instanceof File) {
fileTemplateLoader.closeTemplateSource(source);
} else {
ClassTemplateSource wrapper = (ClassTemplateSource) source;
//close the raw source
classTemplateLoader.closeTemplateSource(wrapper.source);
//cleanup
wrapper.path = null;
wrapper.source = null;
}
}
/**
* Template source for use when a template is loaded from a class.
* <p>
* Used to store the intial path so the template can be copied to the data
* directory.
* </p>
* @author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org
*
*/
static class ClassTemplateSource {
/**
* The path used to load the template.
*/
String path;
/**
* The raw source from the class template loader
*/
Object source;
public ClassTemplateSource(String path, Object source) {
this.path = path;
this.source = source;
}
}
}