json.java.phase.LoadClassPhase Maven / Gradle / Ivy

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package json.java.phase;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.regex.Matcher;

import json.java.application.AjaxApplication;
import json.java.application.AjaxContext;
import json.java.exception.LoadClassException;
import json.java.http.MutableRequest;
import json.java.http.MutableResponse;

public class LoadClassPhase extends PhaseContainer implements Phase {
	
	public LoadClassPhase(AjaxContext context) {
		super(context);
	}

	@Override
	public void start() throws LoadClassException {
		MutableRequest request = context.getRequest();
		MutableResponse response = context.getResponse();
		
		String contextPath = request.getContextPath();
		
		String beanName = null;
		Class beanClass = null;
		
		try {
			StringBuilder script = new StringBuilder();
			Matcher matcher = PATTERN_CLASS.matcher(request.getRequestURI());
			
			if(matcher.find()) {
				beanName = matcher.group(2).trim();
				beanClass = AjaxApplication.ANNOTATED_CLASSES.get(beanName);
				
				if(beanClass == null) {
					throw new ClassNotFoundException();
				} else {
					Object obj = Class.forName(beanClass.getName(), true, this.getClass().getClassLoader()).newInstance();
					Class klass = obj.getClass();
					
					StringBuilder json = new StringBuilder();
					json.append("var " + beanName + " = {");
					
					Method[] classMethods = klass.getDeclaredMethods();
					for(int m = 0; m < classMethods.length; m++) {
						Method method = classMethods[m];
						
						if(!method.getDeclaringClass().equals(Object.class)) {
							String methodName = method.getName();
							Class[] parameterTypes = method.getParameterTypes();
							
							StringBuilder parametersName = new StringBuilder();
							StringBuilder parametersType = new StringBuilder();
							for(int i = 0; i < parameterTypes.length; i++) {
								parametersName.append("param" + i + ((i == parameterTypes.length-1) ? "" : ", "));
								parametersType.append("'" + parameterTypes[i].getCanonicalName() + "'" + ((i == parameterTypes.length-1) ? "" : ", "));
							}
							
							json.append(methodName + ": function("+ parametersName + ((parameterTypes.length > 0) ? ",": "") + " options) {");
							json.append("return Loader.execute('" + beanName + "', '" + methodName + "', [" + parametersType + "], [" + parametersName + "], \""+ contextPath +"\", options);");
							json.append("}");
							
							json.append((m == classMethods.length-1) ? "" : ",");
						}
					}
					
					json.append("};");
					script.append(json);
					
					response.setContentType("text/javascript");
					response.getOutputStream().write(script.toString().getBytes());
				}
			} else {
				throw new ClassNotFoundException();
			}
		} catch (IOException e) {
			throw new LoadClassException(e);
		} catch (InstantiationException e) {
			throw new LoadClassException("Could not instantiate the class \""+ beanClass +"\".", e);
		} catch (IllegalAccessException e) {
			throw new LoadClassException("Could not instantiate the class \""+ beanClass +"\".", e);
		} catch (ClassNotFoundException e) {
			throw new LoadClassException("Could not find a class for the name \""+ beanName +"\".", e);
		}
	}
}