/*
* Copyright 2011 JBoss Inc
*
* 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.jbpm.formbuilder.server.render.xsl;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.lang.reflect.Field;
import java.net.URL;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.commons.beanutils.PropertyUtils;
import org.jbpm.formapi.server.render.RendererException;
public class Renderer implements org.jbpm.formapi.server.render.Renderer {
private final TransformerFactory factory = TransformerFactory.newInstance();
@Override
public Object render(URL url, Map<String, Object> inputData) throws RendererException {
try {
StreamSource template = new StreamSource(url.openStream());
Transformer transformer = factory.newTransformer(template);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
StreamSource inputSource = new StreamSource(toInputString(inputData));
transformer.transform(inputSource, result);
return writer.toString();
} catch (IOException e) {
throw new RendererException("I/O problem rendering " + url, e);
} catch (TransformerConfigurationException e) {
throw new RendererException("transformer configuration problem rendering " + url, e);
} catch (TransformerException e) {
throw new RendererException("transformer problem rendering " + url, e);
} finally {
new File(url.getFile()).delete();
}
}
protected String toInputString(Map<String, Object> inputData) {
StringBuilder builder = new StringBuilder("<?xml version=\"1.0\"?>\n");
if (inputData != null) {
for (Map.Entry<String, Object> entry : inputData.entrySet()) {
builder.append("<").append(entry.getKey()).append(">").
append(toString(entry.getValue())).
append("</").append(entry.getKey()).append(">\n");
}
}
return builder.toString();
}
@SuppressWarnings("unchecked")
protected String toString(Object value) {
StringBuilder builder = new StringBuilder();
if (value instanceof String || value instanceof Number) {
builder.append(value);
} else if (value instanceof Map) {
builder.append(toInputString((Map<String, Object>) value));
} else if (value instanceof Collection) {
for (Object obj : (Collection<?>) value) {
builder.append(toString(obj));
}
} else {
Map<String, Object> metaMap = new HashMap<String, Object>();
for (Field field : value.getClass().getFields()) {
try {
metaMap.put(field.getName(), PropertyUtils.getProperty(value, field.getName()));
} catch (Exception e) {
metaMap.put(field.getName(), "");
}
}
builder.append(toInputString(metaMap));
}
return builder.toString();
}
}