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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.application;
import com.yahoo.config.application.FileSystemWrapper.FileWrapper;
import com.yahoo.config.provision.Environment;
import com.yahoo.config.provision.InstanceName;
import com.yahoo.config.provision.RegionName;
import com.yahoo.config.provision.Tags;
import com.yahoo.text.XML;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* A preprocessor for services.xml files that handles deploy:environment, deploy:region, preprocess:properties, preprocess:include
* and create a new Document which is based on the supplied environment and region
*
* @author hmusum
*/
public class XmlPreProcessor {
final static String deployNamespace = "xmlns:deploy";
final static String deployNamespaceUri = "vespa";
final static String preprocessNamespace = "xmlns:preprocess";
final static String preprocessNamespaceUri = "properties"; //TODO
private final FileWrapper applicationDir;
private final Reader xmlInput;
private final InstanceName instance;
private final Environment environment;
private final RegionName region;
private final Tags tags;
private final List<PreProcessor> chain;
public XmlPreProcessor(File applicationDir,
File xmlInput,
InstanceName instance,
Environment environment,
RegionName region,
Tags tags) throws IOException {
this(applicationDir, new FileReader(xmlInput), instance, environment, region, tags);
}
public XmlPreProcessor(File applicationDir,
Reader xmlInput,
InstanceName instance,
Environment environment,
RegionName region,
Tags tags) {
this(FileSystemWrapper.getDefault(applicationDir.toPath()).wrap(applicationDir.toPath()),
xmlInput,
instance,
environment,
region,
tags);
}
public XmlPreProcessor(FileWrapper applicationDir,
Reader xmlInput,
InstanceName instance,
Environment environment,
RegionName region,
Tags tags) {
this.applicationDir = applicationDir;
this.xmlInput = xmlInput;
this.instance = instance;
this.environment = environment;
this.region = region;
this.tags = tags;
this.chain = setupChain();
}
public Document run() throws ParserConfigurationException, IOException, SAXException, TransformerException {
DocumentBuilder docBuilder = XML.getDocumentBuilder();
Document document = docBuilder.parse(new InputSource(xmlInput));
return execute(document);
}
private Document execute(Document input) throws IOException, TransformerException {
for (PreProcessor preProcessor : chain) {
input = preProcessor.process(input);
}
return input;
}
private List<PreProcessor> setupChain() {
List<PreProcessor> chain = new ArrayList<>();
chain.add(new IncludeProcessor(applicationDir));
chain.add(new OverrideProcessor(instance, environment, region, tags));
chain.add(new PropertiesProcessor());
chain.add(new ValidationProcessor()); // must be last in chain
return chain;
}
}
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