/*
* 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.service.pull.support;
import static com.alibaba.citrus.springext.util.DomUtil.*;
import static com.alibaba.citrus.springext.util.SpringExtUtil.*;
import static com.alibaba.citrus.util.Assert.*;
import static com.alibaba.citrus.util.StringUtil.*;
import java.lang.reflect.Method;
import java.util.List;
import com.alibaba.citrus.service.pull.ToolFactory;
import com.alibaba.citrus.springext.support.parser.AbstractSingleBeanDefinitionParser;
import com.alibaba.citrus.util.internal.StaticFunctionDelegatorBuilder;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.ResourceLoader;
import org.w3c.dom.Element;
/**
* 或者创建一组utils类的mixin。
*
* @author Michael Zhou
*/
public class MixinTool implements ToolFactory, ResourceLoaderAware {
private ClassLoader classLoader;
private Class<?>[] mixinClasses;
private MethodInfo[] mixinMethods;
public void setResourceLoader(ResourceLoader resourceLoader) {
classLoader = resourceLoader.getClassLoader();
}
public void setMixinClasses(Class<?>[] mixinClasses) {
this.mixinClasses = mixinClasses;
}
public void setMixinMethods(MethodInfo[] mixinMethods) {
this.mixinMethods = mixinMethods;
}
public boolean isSingleton() {
return true;
}
public Object createTool() throws Exception {
StaticFunctionDelegatorBuilder builder = new StaticFunctionDelegatorBuilder(classLoader);
// add classes
if (mixinClasses != null) {
for (Class<?> mixinClass : mixinClasses) {
builder.addClass(mixinClass);
}
}
// add methods
if (mixinMethods != null) {
for (MethodInfo methodInfo : mixinMethods) {
for (Method method : methodInfo.containingClass.getMethods()) {
String methodName = method.getName();
if (methodName.equals(methodInfo.methodName)) {
builder.addMethod(method, methodInfo.rename);
}
}
}
}
return builder.toObject();
}
public static class DefinitionParser extends AbstractSingleBeanDefinitionParser<MixinTool> {
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
List<Object> classes = createManagedList(element, parserContext);
List<Object> methods = createManagedList(element, parserContext);
for (Element classElement : subElements(element, and(sameNs(element), name("class")))) {
String className = assertNotNull(trimToNull(classElement.getAttribute("name")), "mixin class name");
List<Element> methodElements = subElements(classElement, and(sameNs(classElement), name("method")));
if (methodElements.isEmpty()) {
classes.add(className);
} else {
for (Element methodElement : methodElements) {
BeanDefinitionBuilder methodBuilder = BeanDefinitionBuilder
.genericBeanDefinition(MethodInfo.class);
methodBuilder.addConstructorArgValue(className);
methodBuilder.addConstructorArgValue(assertNotNull(
trimToNull(methodElement.getAttribute("name")), "mixin method name"));
methodBuilder.addConstructorArgValue(trimToNull(methodElement.getAttribute("renameTo")));
methods.add(methodBuilder.getBeanDefinition());
}
}
}
builder.addPropertyValue("mixinClasses", classes);
builder.addPropertyValue("mixinMethods", methods);
}
}
public static final class MethodInfo {
private Class<?> containingClass;
private String methodName;
private String rename;
public MethodInfo(Class<?> containingClass, String methodName, String rename) {
this.containingClass = containingClass;
this.methodName = methodName;
this.rename = rename;
}
}
}