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package edu.ucsb.nceas.metacat.index;
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import org.xml.sax.InputSource;
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import javax.xml.xpath.*;
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import java.io.Reader;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Identify document classes for indexing. Replaces equivalent Spring-based configuration
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* used by DataONE indexer. It's not clear that we actually need to perfectly mimic this
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* stuff, but for the now we shall. Note that the replicated DataONE classifications
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* apply only to DataONE System Metadata documents. Additional classifiers have been
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* added for plain EML etc.
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*
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* There are better ways to configure this stuff, but this is in effect a direct transcript
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* of the DataONE material. Automatic extraction from Spring configuration is doable, but
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* not trivial.
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*/
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public class DocType {
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//
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private static final XPath xpath = XPathFactory.newInstance().newXPath();
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private static final List<XPathExpression> d1sys = new ArrayList<XPathExpression>(1);
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private static final List<XPathExpression> d1eml = new ArrayList<XPathExpression>(4);
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private static final List<XPathExpression> d1dryad = new ArrayList<XPathExpression>(1);
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private static final List<XPathExpression> d1fgdc = new ArrayList<XPathExpression>(3);
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private static final List<XPathExpression> eml = new ArrayList<XPathExpression>(4);
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static {
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xpath.setNamespaceContext(new MCXmlNamespace());
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try {
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d1sys.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata"));
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d1eml.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'eml://ecoinformatics.org/eml-2.0.0']"));
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d1eml.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'eml://ecoinformatics.org/eml-2.0.1']"));
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d1eml.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'eml://ecoinformatics.org/eml-2.1.1']"));
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d1eml.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'eml://ecoinformatics.org/eml-2.1.1']"));
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d1dryad.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'http://purl.org/dryad/terms/']"));
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d1fgdc.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'FGDC-STD-001-1998']"));
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d1fgdc.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'FGDC-STD-001.1-1999']"));
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d1fgdc.add(xpath.compile("/" + MCXmlNamespace.D1 + ":systemMetadata/formatId[text() = 'FGDC-STD-001.2-1999']"));
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eml.add(xpath.compile("/" + MCXmlNamespace.E200 + ":eml"));
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eml.add(xpath.compile("/" + MCXmlNamespace.E201 + ":eml"));
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eml.add(xpath.compile("/" + MCXmlNamespace.E210 + ":eml"));
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eml.add(xpath.compile("/" + MCXmlNamespace.E211 + ":eml"));
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} catch (XPathExpressionException e) {
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// TODO: logs
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e.printStackTrace();
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}
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}
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public static boolean isSysmeta(Reader in) {
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return check(d1sys, in);
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}
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public static boolean isSyseml(Reader in) {
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return check(d1eml, in);
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}
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public static boolean isSysdryad(Reader in) {
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return check(d1dryad, in);
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}
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public static boolean isSysfgdc(Reader in) {
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return check(d1fgdc, in);
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}
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public static boolean isEml(Reader in) {
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return check(eml, in);
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}
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public static boolean check(List<XPathExpression> exprs, Reader in) {
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InputSource src = new InputSource(in);
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try {
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for (XPathExpression x : exprs) {
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Boolean match = (Boolean) x.evaluate(src, XPathConstants.BOOLEAN);
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if (match != null && match.booleanValue()) {
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return true;
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}
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}
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} catch (XPathExpressionException e) {
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}
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return false;
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}
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}
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