| /** |
| * 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.spi.UriEndpoint; |
| import org.apache.camel.spi.UriParam; |
| import org.apache.camel.util.ExchangeHelper; |
| import org.stringtemplate.v4.NoIndentWriter; |
| import org.stringtemplate.v4.ST; |
| import org.stringtemplate.v4.STGroup; |
| |
| /** |
| * Transforms the message using a String template. |
| */ |
| @UriEndpoint(scheme = "stringtemplate", title = "String Template", syntax = "stringtemplate:resourceUri", producerOnly = true, label = "transformation") |
| public class StringTemplateEndpoint extends ResourceEndpoint { |
| |
| @UriParam(defaultValue = "<") |
| private char delimiterStart = STGroup.defaultGroup.delimiterStartChar; |
| @UriParam(defaultValue = ">") |
| 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; |
| } |
| |
| /** |
| * The variable start delimiter |
| */ |
| public void setDelimiterStart(char delimiterStart) { |
| this.delimiterStart = delimiterStart; |
| } |
| |
| public char getDelimiterStop() { |
| return delimiterStop; |
| } |
| |
| /** |
| * The variable end delimiter |
| */ |
| public void setDelimiterStop(char delimiterStop) { |
| this.delimiterStop = delimiterStop; |
| } |
| |
| @Override |
| protected void onExchange(Exchange exchange) throws Exception { |
| StringWriter buffer = new StringWriter(); |
| |
| @SuppressWarnings("unchecked") |
| Map<String, Object> variableMap = exchange.getIn().getHeader(StringTemplateConstants.STRINGTEMPLATE_VARIABLE_MAP, Map.class); |
| if (variableMap == null) { |
| 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()); |
| } |
| } |