com.apporiented.spring.override.GenericBeanDefinitionParser Maven / Gradle / Ivy
/* 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.apporiented.spring.override;
import com.apporiented.spring.override.AbstractGenericBeanDefinitionParser;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.core.Conventions;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import java.util.HashMap;
import java.util.HashSet;
/**
* Generic bean definition parser that assumes that all xml element attribute names have corresponding bean property names.
* @author Carsten Woelk [cwoelk at neteye dot de]
* @author Lars Behnke [lars.behnke at apporiented.com]
*/
public class GenericBeanDefinitionParser extends AbstractGenericBeanDefinitionParser {
public String aliasAttribute;
private HashMap translations = new HashMap();
private HashSet references = new HashSet();
public GenericBeanDefinitionParser(Class beanClass) {
super(beanClass);
}
public GenericBeanDefinitionParser(String className) {
super(className);
}
public GenericBeanDefinitionParser addTranslation(String attributeName,
String property) {
translations.put(attributeName, property);
return this;
}
public GenericBeanDefinitionParser addReference(String attributeName) {
references.add(extractPropertyName(attributeName));
return this;
}
public void setAliasAttribute(String aliasAttribute) {
this.aliasAttribute = aliasAttribute;
}
protected String resolveAlias(Element element,
AbstractBeanDefinition definition, ParserContext parserContext) {
return aliasAttribute != null ? element.getAttribute(aliasAttribute) : null;
}
/**
* Parse the supplied {@link org.w3c.dom.Element} and populate the supplied
* {@link org.springframework.beans.factory.support.BeanDefinitionBuilder} as required.
* This implementation maps any attributes present on the
* supplied element to {@link org.springframework.beans.PropertyValue}
* instances, and
* {@link org.springframework.beans.factory.support.BeanDefinitionBuilder#addPropertyValue(String, Object) adds them}
* to the
* {@link org.springframework.beans.factory.config.BeanDefinition builder}.
*
The {@link #extractPropertyName(String)} method is used to
* reconcile the name of an attribute with the name of a JavaBean
* property.
* @param element the XML element being parsed
* @param parserContext the object encapsulating the current state of the parsing process
* @param builder used to define the BeanDefinition
* @see #extractPropertyName(String)
*/
protected final void doParse(Element element,
ParserContext parserContext, BeanDefinitionBuilder builder) {
NamedNodeMap attributes = element.getAttributes();
for (int x = 0; x < attributes.getLength(); x++) {
Attr attribute = (Attr) attributes.item(x);
String name = attribute.getLocalName();
if (isEligibleAttribute(name, parserContext)) {
String propertyName = extractPropertyName(name);
Assert.state(StringUtils.hasText(propertyName),
"Illegal property name returned from 'extractPropertyName(String)': cannot be null or empty.");
Object value;
if (references.contains(propertyName)) {
value = new RuntimeBeanReference(attribute.getValue());
}
else {
value = attribute.getValue();
}
builder.addPropertyValue(propertyName, value);
}
}
postProcess(builder, parserContext, element);
}
/**
* Determine whether the given attribute is eligible for being
* turned into a corresponding bean property value.
*
The default implementation considers any attribute as eligible,
* except for the "id" and "name" attributes in case of a top-level bean.
* @param attributeName the attribute name taken straight from the
* XML element being parsed (never null)
* @param parserContext The parser context.
* @return true if eligible.
*/
protected boolean isEligibleAttribute(String attributeName,
ParserContext parserContext) {
return parserContext.isNested() || (!attributeName.equals(ID_ATTRIBUTE)
&& !attributeName.equals(aliasAttribute));
}
/**
* Extract a JavaBean property name from the supplied attribute name.
*
The default implementation first looks for a translation set via
* {@link #addTranslation(String, String)}. If no translation is found,
* the {@link org.springframework.core.Conventions#attributeNameToPropertyName(String)}
* method to perform the extraction.
*
The name returned must obey the standard JavaBean property name
* conventions. For example for a class with a setter method
* 'setBingoHallFavourite(String)', the name returned had
* better be 'bingoHallFavourite' (with that exact casing).
* @param attributeName the attribute name taken straight from the
* XML element being parsed (never null)
* @return the extracted JavaBean property name (must never be null)
*/
protected String extractPropertyName(String attributeName) {
String property = (String) translations.get(attributeName);
if (property == null) {
property = Conventions.attributeNameToPropertyName(attributeName);
}
return property;
}
/**
* Hook method that derived classes can implement to inspect/change a
* bean definition after parsing is complete.
*
The default implementation delegates to the postProcess
* version without ParserContext argument.
* @param beanDefinition the parsed (and probably totally defined) bean definition being built
* @param parserContext the object encapsulating the current state of the parsing process
* @param element the XML element that was the source of the bean definition's metadata
*/
protected void postProcess(BeanDefinitionBuilder beanDefinition,
ParserContext parserContext, Element element) {
postProcess(beanDefinition, element);
}
/**
* Hook method that derived classes can implement to inspect/change a
* bean definition after parsing is complete.
*
The default implementation does nothing.
* @param beanDefinition the parsed (and probably totally defined) bean definition being built
* @param element the XML element that was the source of the bean definition's metadata
*/
protected void postProcess(BeanDefinitionBuilder beanDefinition, Element element) {
}
}