/* 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 org.camunda.bpm.engine.impl.form.engine;
import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;
import java.io.UnsupportedEncodingException;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.delegate.VariableScope;
import org.camunda.bpm.engine.form.FormData;
import org.camunda.bpm.engine.form.StartFormData;
import org.camunda.bpm.engine.form.TaskFormData;
import org.camunda.bpm.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.persistence.entity.ResourceEntity;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;
import org.camunda.bpm.engine.impl.scripting.ExecutableScript;
import org.camunda.bpm.engine.impl.scripting.ScriptFactory;
import org.camunda.bpm.engine.impl.scripting.engine.ScriptingEngines;
import org.camunda.bpm.engine.impl.scripting.env.ScriptingEnvironment;
/**
* @author Tom Baeyens
*/
public class JuelFormEngine implements FormEngine {
public String getName() {
return "juel";
}
public Object renderStartForm(StartFormData startForm) {
if (startForm.getFormKey()==null) {
return null;
}
String formTemplateString = getFormTemplateString(startForm, startForm.getFormKey());
return executeScript(formTemplateString, null);
}
public Object renderTaskForm(TaskFormData taskForm) {
if (taskForm.getFormKey()==null) {
return null;
}
String formTemplateString = getFormTemplateString(taskForm, taskForm.getFormKey());
TaskEntity task = (TaskEntity) taskForm.getTask();
return executeScript(formTemplateString, task.getExecution());
}
protected Object executeScript(String scriptSrc, VariableScope scope) {
ProcessEngineConfigurationImpl processEngineConfiguration = Context.getProcessEngineConfiguration();
ScriptingEnvironment scriptingEnvironment = processEngineConfiguration.getScriptingEnvironment();
ScriptFactory scriptFactory = processEngineConfiguration.getScriptFactory();
ExecutableScript script = scriptFactory.createScriptFromSource(ScriptingEngines.DEFAULT_SCRIPTING_LANGUAGE, scriptSrc);
return scriptingEnvironment.execute(script, scope);
}
protected String getFormTemplateString(FormData formInstance, String formKey) {
String deploymentId = formInstance.getDeploymentId();
ResourceEntity resourceStream = Context
.getCommandContext()
.getResourceManager()
.findResourceByDeploymentIdAndResourceName(deploymentId, formKey);
ensureNotNull("Form with formKey '" + formKey + "' does not exist", "resourceStream", resourceStream);
byte[] resourceBytes = resourceStream.getBytes();
String encoding = "UTF-8";
String formTemplateString = "";
try {
formTemplateString = new String(resourceBytes, encoding);
} catch (UnsupportedEncodingException e) {
throw new ProcessEngineException("Unsupported encoding of :" + encoding, e);
}
return formTemplateString;
}
}