/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.component.stringtemplate;
import java.io.StringWriter;
import java.util.Map;
import org.apache.camel.Component;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.Message;
import org.apache.camel.component.ResourceEndpoint;
import org.apache.camel.util.ExchangeHelper;
import org.stringtemplate.v4.NoIndentWriter;
import org.stringtemplate.v4.ST;
import org.stringtemplate.v4.STGroup;
/**
* @version
*/
public class StringTemplateEndpoint extends ResourceEndpoint {
private char delimiterStart = STGroup.defaultGroup.delimiterStartChar;
private char delimiterStop = STGroup.defaultGroup.delimiterStopChar;
public StringTemplateEndpoint() {
}
public StringTemplateEndpoint(String endpointUri, Component component, String resourceUri) {
super(endpointUri, component, resourceUri);
}
@Override
public boolean isSingleton() {
return true;
}
@Override
public ExchangePattern getExchangePattern() {
return ExchangePattern.InOut;
}
public char getDelimiterStart() {
return delimiterStart;
}
public void setDelimiterStart(char delimiterStart) {
this.delimiterStart = delimiterStart;
}
public char getDelimiterStop() {
return delimiterStop;
}
public void setDelimiterStop(char delimiterStop) {
this.delimiterStop = delimiterStop;
}
@Override
protected void onExchange(Exchange exchange) throws Exception {
StringWriter buffer = new StringWriter();
Map<String, Object> variableMap = ExchangeHelper.createVariableMap(exchange);
// getResourceAsInputStream also considers the content cache
String text = exchange.getContext().getTypeConverter().mandatoryConvertTo(String.class, getResourceAsInputStream());
ST template = new ST(text, delimiterStart, delimiterStop);
for (Map.Entry<String, Object> entry : variableMap.entrySet()) {
template.add(entry.getKey(), entry.getValue());
}
log.debug("StringTemplate is writing using attributes: {}", variableMap);
template.write(new NoIndentWriter(buffer));
// now lets output the results to the exchange
Message out = exchange.getOut();
out.setBody(buffer.toString());
out.setHeaders(exchange.getIn().getHeaders());
out.setHeader(StringTemplateConstants.STRINGTEMPLATE_RESOURCE_URI, getResourceUri());
out.setAttachments(exchange.getIn().getAttachments());
}
}