/*
* Copyright 2011 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.data.hadoop.config;
import java.util.Collection;
import java.util.Collections;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.beans.factory.support.ManagedList;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.data.hadoop.pig.PigContextFactoryBean;
import org.springframework.data.hadoop.pig.PigScript;
import org.springframework.data.hadoop.pig.PigServerFactoryBean;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
import org.w3c.dom.Element;
/**
* Parser for 'pig-server' element.
*
* @author Costin Leau
*/
public class PigServerParser extends AbstractPropertiesConfiguredBeanDefinitionParser {
@Override
protected Class<?> getBeanClass(Element element) {
return PigServerFactoryBean.class;
}
@Override
protected boolean isEligibleAttribute(String attributeName) {
return !("paths-to-skip".equals(attributeName)
|| "job-tracker".equals(attributeName) || "configuration-ref".equals(attributeName) || "exec-type".equals(attributeName))
&& super.isEligibleAttribute(attributeName);
}
@Override
protected String defaultId(ParserContext context, Element element) {
return "pigFactory";
}
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
// parse attributes using conventions
super.doParse(element, parserContext, builder);
// parse scripts
Collection<BeanDefinition> scripts = parseScripts(parserContext, element);
if (!CollectionUtils.isEmpty(scripts)) {
builder.addPropertyValue("scripts", scripts);
}
NamespaceUtils.setCSVProperty(element, builder, "paths-to-skip", "pathsToSkip");
// parse nested PigContext definition
BeanDefinitionBuilder contextBuilder = BeanDefinitionBuilder.genericBeanDefinition(PigContextFactoryBean.class);
NamespaceUtils.setPropertyValue(element, contextBuilder, "job-tracker");
NamespaceUtils.setPropertyValue(element, contextBuilder, "exec-type");
NamespaceUtils.setPropertyReference(element, contextBuilder, "configuration-ref");
// move properties setting from PigServer to PigContext class
MutablePropertyValues pv = builder.getRawBeanDefinition().getPropertyValues();
String prop = "properties";
if (pv.contains(prop)) {
contextBuilder.addPropertyValue(prop, pv.getPropertyValue(prop).getValue());
pv.removePropertyValue(prop);
}
builder.addPropertyValue("pigContext", contextBuilder.getBeanDefinition());
}
public static Collection<BeanDefinition> parseScripts(ParserContext context, Element element) {
Collection<Element> children = DomUtils.getChildElementsByTagName(element, "script");
if (!children.isEmpty()) {
Collection<BeanDefinition> defs = new ManagedList<BeanDefinition>(children.size());
for (Element child : children) {
// parse source
String location = child.getAttribute("location");
String inline = DomUtils.getTextValue(child);
boolean hasScriptInlined = StringUtils.hasText(inline);
GenericBeanDefinition def = new GenericBeanDefinition();
def.setSource(child);
def.setBeanClass(PigScript.class);
Object resource = null;
if (StringUtils.hasText(location)) {
if (hasScriptInlined) {
context.getReaderContext().error("cannot specify both 'location' and a nested script; use only one", element);
}
resource = location;
}
else {
if (!hasScriptInlined) {
context.getReaderContext().error("no 'location' or nested script specified", element);
}
resource = BeanDefinitionBuilder.genericBeanDefinition(ByteArrayResource.class).
addConstructorArgValue(inline).
addConstructorArgValue("resource for inlined script").getBeanDefinition();
}
def.getConstructorArgumentValues().addIndexedArgumentValue(0, resource, Resource.class.getName());
String args = DomUtils.getChildElementValueByTagName(child, "arguments");
if (args != null) {
// create linked properties
BeanDefinition params = BeanDefinitionBuilder.genericBeanDefinition(LinkedProperties.class).addConstructorArgValue(args).getBeanDefinition();
def.getConstructorArgumentValues().addIndexedArgumentValue(1, params);
}
defs.add(def);
}
return defs;
}
return Collections.emptyList();
}
}