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/*
 * Copyright 2010-2013 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.gemfire.config;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.ManagedList;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.data.gemfire.snapshot.SnapshotServiceFactoryBean;
import org.springframework.util.xml.DomUtils;
import org.w3c.dom.Element;

/**
 * Parser for <gfe-data:snapshot-service> bean definition elements in Spring XML config.
 *
 * @author John Blum
 * @see org.springframework.beans.factory.config.BeanDefinition
 * @see org.springframework.beans.factory.support.BeanDefinitionBuilder
 * @see org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser
 * @see org.springframework.beans.factory.xml.ParserContext
 * @see org.springframework.data.gemfire.snapshot.SnapshotServiceFactoryBean
 * @since 1.7.0
 */
class SnapshotServiceParser extends AbstractSingleBeanDefinitionParser {

	@Override
	protected Class getBeanClass(final Element element) {
		return SnapshotServiceFactoryBean.class;
	}

	@Override
	protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
		super.doParse(element, parserContext, builder);

		ParsingUtils.setCacheReference(element, builder);
		ParsingUtils.setRegionReference(element, builder);
		ParsingUtils.setPropertyValue(element, builder, "suppress-import-on-init");
		builder.addPropertyValue("exports", parseExports(element, parserContext));
		builder.addPropertyValue("imports", parseImports(element, parserContext));
	}

	private ManagedList parseExports(Element element, ParserContext parserContext) {
		return parseSnapshots(element, parserContext, "snapshot-export");
	}

	private ManagedList parseImports(Element element, ParserContext parserContext) {
		return parseSnapshots(element, parserContext, "snapshot-import");
	}

	private ManagedList parseSnapshots(Element element, ParserContext parserContext,
			String childTagName) {

		ManagedList snapshotBeans = new ManagedList();

		for (Element childElement : DomUtils.getChildElementsByTagName(element, childTagName)) {
			snapshotBeans.add(parseSnapshotMetadata(childElement, parserContext));
		}

		return snapshotBeans;
	}

	private BeanDefinition parseSnapshotMetadata(Element snapshotMetadataElement, ParserContext parserContext) {
		BeanDefinitionBuilder snapshotMetadataBuilder = BeanDefinitionBuilder.genericBeanDefinition(
			SnapshotServiceFactoryBean.SnapshotMetadata.class);

		snapshotMetadataBuilder.addConstructorArgValue(snapshotMetadataElement.getAttribute("location"));

		if (isSnapshotFilterSpecified(snapshotMetadataElement)) {
			snapshotMetadataBuilder.addConstructorArgValue(ParsingUtils.parseRefOrNestedBeanDeclaration(
				parserContext, snapshotMetadataElement, snapshotMetadataBuilder, "filter-ref", true));
		}

		snapshotMetadataBuilder.addConstructorArgValue(snapshotMetadataElement.getAttribute("format"));

		return snapshotMetadataBuilder.getBeanDefinition();
	}

	private boolean isSnapshotFilterSpecified(final Element snapshotMetadataElement) {
		return (snapshotMetadataElement.hasAttribute("filter-ref") || snapshotMetadataElement.hasChildNodes());
	}

}