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package eu.dnetlib.msro.workflows.hadoop;
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import java.util.List;
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import javax.annotation.Resource;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import com.google.common.collect.Iterables;
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import com.googlecode.sarasvati.NodeToken;
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import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;
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import eu.dnetlib.enabling.locators.UniqueServiceLocator;
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import eu.dnetlib.msro.workflows.nodes.SimpleJobNode;
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public class FindIndexJobNode extends SimpleJobNode {
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/**
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* logger.
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*/
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private static final Log log = LogFactory.getLog(FindIndexJobNode.class); // NOPMD by marko on 11/24/08 5:02 PM
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@Resource
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private UniqueServiceLocator serviceLocator;
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/**
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* if non null, overrides format from env.
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*/
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private String mdFormat;
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/**
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* if non null, overrides format from env.
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*/
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private String layout;
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/**
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* if non null, overrides format from env.
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*/
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private String interpretation;
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/**
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* {@inheritDoc}
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*
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* @see com.googlecode.sarasvati.mem.MemNode#execute(com.googlecode.sarasvati.Engine, com.googlecode.sarasvati.NodeToken)
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*/
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@Override
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public String execute(final NodeToken token) {
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final String envFormat = token.getFullEnv().getAttribute("format");
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final String envLayout = token.getFullEnv().getAttribute("layout");
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final String envInterpretation = token.getFullEnv().getAttribute("interpretation");
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final String format = handleOverride(token, "format", envFormat, getMdFormat());
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final String layout = handleOverride(token, "layout", envLayout, getLayout());
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final String interp = handleOverride(token, "interpretation", envInterpretation, getInterpretation());
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String mdRef = format + "-" + layout + "-" + interp;
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log.info("searching index for [" + mdRef + "]");
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final String indexId = findIndex(format, layout, interp);
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token.getEnv().setAttribute("index_id", indexId);
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if (indexId == null || indexId.isEmpty()) {
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log.info("no index was found for [" + mdRef + "]");
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return "notFound";
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} else {
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log.info("index found for [" + mdRef + "]: " + indexId);
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return "found";
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}
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}
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private String findIndex(final String format, final String layout, final String interp) {
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final String xquery =
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"for $x in /RESOURCE_PROFILE[.//RESOURCE_TYPE/@value='IndexDSResourceType']" + "return $x[.//METADATA_FORMAT = '" + format
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+ "' and .//METADATA_FORMAT_LAYOUT='" + layout + "' and .//METADATA_FORMAT_INTERPRETATION = '" + interp
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+ "']//RESOURCE_IDENTIFIER/@value/string()";
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try {
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log.info("xquery: " + xquery);
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List<String> ids = serviceLocator.getService(ISLookUpService.class).quickSearchProfile(xquery);
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log.info("found indexDS ids: " + ids);
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if (ids == null || ids.isEmpty()) { return null; }
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if (ids.size() > 1) { throw new IllegalStateException("found more than one index of given format: " + format + ", layout: " + layout
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+ ", interpretation: " + interp); }
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return Iterables.getOnlyElement(ids);
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} catch (Exception e) {
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return null;
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}
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}
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private String handleOverride(final NodeToken token, final String name, final String env, final String override) {
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if (override != null) {
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token.getEnv().setAttribute(name, override);
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}
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return override != null ? override : env;
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}
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public String getMdFormat() {
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return mdFormat;
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}
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public void setMdFormat(final String mdFormat) {
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this.mdFormat = mdFormat;
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}
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public String getLayout() {
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return layout;
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}
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public void setLayout(final String layout) {
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this.layout = layout;
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}
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public String getInterpretation() {
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return interpretation;
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}
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public void setInterpretation(final String interpretation) {
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this.interpretation = interpretation;
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}
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}
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