/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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 com.alibaba.citrus.turbine.pipeline.valve;
import static com.alibaba.citrus.springext.util.SpringExtUtil.*;
import static com.alibaba.citrus.turbine.util.TurbineUtil.*;
import static com.alibaba.citrus.util.StringUtil.*;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alibaba.citrus.service.pipeline.PipelineContext;
import com.alibaba.citrus.service.pipeline.support.AbstractValveDefinitionParser;
import com.alibaba.citrus.turbine.TurbineRunData;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;
/**
* 将screen所返回的结果转换成json格式并输出。
*
* @author Michael Zhou
*/
public class RenderResultAsJsonValve extends AbstractInputOutputValve {
private static final String DEFAULT_CONTENT_TYPE = "application/json";
private static final String DEFAULT_JAVASCRIPT_VARIABLE = null;
private static final String DEFAULT_JAVASCRIPT_CONTENT_TYPE = "application/javascript";
@Autowired
private HttpServletRequest request;
@Autowired
private HttpServletResponse response;
private String contentType;
private String javascriptVariable;
private String javascriptContentType;
public String getContentType() {
return contentType == null ? DEFAULT_CONTENT_TYPE : contentType;
}
public void setContentType(String contentType) {
this.contentType = trimToNull(contentType);
}
public String getJavascriptVariable() {
return javascriptVariable == null ? DEFAULT_JAVASCRIPT_VARIABLE : javascriptVariable;
}
public void setJavascriptVariable(String javascriptVariable) {
this.javascriptVariable = trimToNull(javascriptVariable);
}
public String getJavascriptContentType() {
return javascriptContentType == null ? DEFAULT_JAVASCRIPT_CONTENT_TYPE : javascriptContentType;
}
public void setJavascriptContentType(String javascriptContentType) {
this.javascriptContentType = trimToNull(javascriptContentType);
}
public void invoke(PipelineContext pipelineContext) throws Exception {
TurbineRunData rundata = getTurbineRunData(request);
if (!rundata.isRedirected()) {
Object resultObject = consumeInputValue(pipelineContext);
if (resultObject == null) {
return;
}
String javascriptVariable = getJavascriptVariable();
boolean outputAsJson = javascriptVariable == null;
if (outputAsJson) {
// output as json
response.setContentType(getContentType());
} else {
// output as javascript
response.setContentType(getJavascriptContentType());
}
PrintWriter out = response.getWriter();
String jsonResult = JSON.toJSONString(resultObject);
if (outputAsJson) {
out.print(jsonResult);
} else {
out.print("var ");
out.print(javascriptVariable);
out.print(" = ");
out.print(jsonResult);
out.print(";");
}
}
pipelineContext.invokeNext();
}
public static class DefinitionParser extends AbstractValveDefinitionParser<RenderResultAsJsonValve> {
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
attributesToProperties(element, builder, "input", "contentType", "javascriptVariable", "javascriptContentType");
}
}
}