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Spring Framework example source code file (UtilNamespaceHandler.java)

This example Spring Framework source code file (UtilNamespaceHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractbeandefinition, abstractsimplebeandefinitionparser, abstractsinglebeandefinitionparser, attribute, beandefinitionbuilder, beandefinitionbuilder, class, class, dom, listbeandefinitionparser, parsercontext, parsercontext, propertypathbeandefinitionparser, string, string, util

The Spring Framework UtilNamespaceHandler.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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 org.springframework.beans.factory.xml;

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.w3c.dom.Element;

import org.springframework.beans.factory.config.FieldRetrievingFactoryBean;
import org.springframework.beans.factory.config.ListFactoryBean;
import org.springframework.beans.factory.config.MapFactoryBean;
import org.springframework.beans.factory.config.PropertiesFactoryBean;
import org.springframework.beans.factory.config.PropertyPathFactoryBean;
import org.springframework.beans.factory.config.SetFactoryBean;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.util.StringUtils;

/**
 * {@link NamespaceHandler} for the <code>util namespace.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 */
public class UtilNamespaceHandler extends NamespaceHandlerSupport {

	private static final String SCOPE_ATTRIBUTE = "scope";


	public void init() {
		registerBeanDefinitionParser("constant", new ConstantBeanDefinitionParser());
		registerBeanDefinitionParser("property-path", new PropertyPathBeanDefinitionParser());
		registerBeanDefinitionParser("list", new ListBeanDefinitionParser());
		registerBeanDefinitionParser("set", new SetBeanDefinitionParser());
		registerBeanDefinitionParser("map", new MapBeanDefinitionParser());
		registerBeanDefinitionParser("properties", new PropertiesBeanDefinitionParser());
	}


	private static class ConstantBeanDefinitionParser extends AbstractSimpleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return FieldRetrievingFactoryBean.class;
		}

		protected String resolveId(Element element, AbstractBeanDefinition definition, ParserContext parserContext) {
			String id = super.resolveId(element, definition, parserContext);
			if (!StringUtils.hasText(id)) {
				id = element.getAttribute("static-field");
			}
			return id;
		}
	}


	private static class PropertyPathBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return PropertyPathFactoryBean.class;
		}

		protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
			String path = element.getAttribute("path");
			if (!StringUtils.hasText(path)) {
				parserContext.getReaderContext().error("Attribute 'path' must not be empty", element);
				return;
			}
			int dotIndex = path.indexOf(".");
			if (dotIndex == -1) {
				parserContext.getReaderContext().error(
						"Attribute 'path' must follow pattern 'beanName.propertyName'", element);
				return;
			}
			String beanName = path.substring(0, dotIndex);
			String propertyPath = path.substring(dotIndex + 1);
			builder.addPropertyValue("targetBeanName", beanName);
			builder.addPropertyValue("propertyPath", propertyPath);
		}

		protected String resolveId(Element element, AbstractBeanDefinition definition, ParserContext parserContext) {
			String id = super.resolveId(element, definition, parserContext);
			if (!StringUtils.hasText(id)) {
				id = element.getAttribute("path");
			}
			return id;
		}
	}


	private static class ListBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return ListFactoryBean.class;
		}

		protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
			String listClass = element.getAttribute("list-class");
			List parsedList = parserContext.getDelegate().parseListElement(element, builder.getRawBeanDefinition());
			builder.addPropertyValue("sourceList", parsedList);
			if (StringUtils.hasText(listClass)) {
				builder.addPropertyValue("targetListClass", listClass);
			}
			String scope = element.getAttribute(SCOPE_ATTRIBUTE);
			if (StringUtils.hasLength(scope)) {
				builder.setScope(scope);
			}
		}
	}


	private static class SetBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return SetFactoryBean.class;
		}

		protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
			String setClass = element.getAttribute("set-class");
			Set parsedSet = parserContext.getDelegate().parseSetElement(element, builder.getRawBeanDefinition());
			builder.addPropertyValue("sourceSet", parsedSet);
			if (StringUtils.hasText(setClass)) {
				builder.addPropertyValue("targetSetClass", setClass);
			}
			String scope = element.getAttribute(SCOPE_ATTRIBUTE);
			if (StringUtils.hasLength(scope)) {
				builder.setScope(scope);
			}
		}
	}


	private static class MapBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return MapFactoryBean.class;
		}

		protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
			String mapClass = element.getAttribute("map-class");
			Map parsedMap = parserContext.getDelegate().parseMapElement(element, builder.getRawBeanDefinition());
			builder.addPropertyValue("sourceMap", parsedMap);
			if (StringUtils.hasText(mapClass)) {
				builder.addPropertyValue("targetMapClass", mapClass);
			}
			String scope = element.getAttribute(SCOPE_ATTRIBUTE);
			if (StringUtils.hasLength(scope)) {
				builder.setScope(scope);
			}
		}
	}


	private static class PropertiesBeanDefinitionParser extends AbstractSimpleBeanDefinitionParser {

		protected Class getBeanClass(Element element) {
			return PropertiesFactoryBean.class;
		}

		protected boolean isEligibleAttribute(String attributeName) {
			return super.isEligibleAttribute(attributeName) && !SCOPE_ATTRIBUTE.equals(attributeName);
		}

		protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
			super.doParse(element, parserContext, builder);
			Properties parsedProps = parserContext.getDelegate().parsePropsElement(element);
			builder.addPropertyValue("properties", parsedProps);
			String scope = element.getAttribute(SCOPE_ATTRIBUTE);
			if (StringUtils.hasLength(scope)) {
				builder.setScope(scope);
			}
		}
	}

}

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