at.newmedialab.ldpath.template.engine.NamespaceDirective Maven / Gradle / Ivy
/*
* Copyright (c) 2011 Salzburg Research.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package at.newmedialab.ldpath.template.engine;
import at.newmedialab.ldpath.template.model.freemarker.TemplateWrapperModel;
import freemarker.core.Environment;
import freemarker.template.*;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Add file description here!
*
* Author: Sebastian Schaffert
*/
public class NamespaceDirective implements TemplateDirectiveModel {
public NamespaceDirective() {
}
/**
* Executes this user-defined directive; called by FreeMarker when the user-defined
* directive is called in the template.
*
* @param env the current processing environment. Note that you can access
* the output {@link java.io.Writer Writer} by {@link freemarker.core.Environment#getOut()}.
* @param params the parameters (if any) passed to the directive as a
* map of key/value pairs where the keys are {@link String}-s and the
* values are {@link freemarker.template.TemplateModel} instances. This is never
* null. If you need to convert the template models to POJOs,
* you can use the utility methods in the {@link freemarker.template.utility.DeepUnwrap} class.
* @param loopVars an array that corresponds to the "loop variables", in
* the order as they appear in the directive call. ("Loop variables" are out-parameters
* that are available to the nested body of the directive; see in the Manual.)
* You set the loop variables by writing this array. The length of the array gives the
* number of loop-variables that the caller has specified.
* Never null, but can be a zero-length array.
* @param body an object that can be used to render the nested content (body) of
* the directive call. If the directive call has no nested content (i.e., it is like
* [@myDirective /] or [@myDirective][/@myDirective]), then this will be
* null.
* @throws freemarker.template.TemplateException
*
* @throws java.io.IOException
*/
@Override
public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) throws TemplateException, IOException {
TemplateWrapperModel> namespacesWrapped = (TemplateWrapperModel>)env.getGlobalVariable("namespaces");
Map namespaces;
if(namespacesWrapped == null) {
namespaces = new HashMap();
namespacesWrapped = new TemplateWrapperModel>(namespaces);
env.setGlobalVariable("namespaces",namespacesWrapped);
} else {
namespaces = namespacesWrapped.getAdaptedObject(Map.class);
}
Iterator paramIter = params.entrySet().iterator();
while (paramIter.hasNext()) {
Map.Entry ent = (Map.Entry) paramIter.next();
String paramName = (String) ent.getKey();
TemplateModel paramValue = (TemplateModel) ent.getValue();
if(paramValue instanceof TemplateScalarModel) {
String uri = ((TemplateScalarModel)paramValue).getAsString();
try {
URI test = new URI(uri);
namespaces.put(paramName,test.toString());
} catch (URISyntaxException e) {
throw new TemplateModelException("invalid namespace URI '"+uri+"'",e);
}
}
}
}
}