Package org.teiid.metadata.index

Source Code of org.teiid.metadata.index.VDBMetadataFactory

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*
* This library is free software; you can redistribute it and/or
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* Lesser General Public License for more details.
*
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package org.teiid.metadata.index;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;

import javax.xml.bind.JAXBException;

import org.teiid.core.CoreConstants;
import org.teiid.core.TeiidRuntimeException;
import org.teiid.core.util.FileUtils;
import org.teiid.core.util.LRUCache;
import org.teiid.core.util.UnitTestUtil;
import org.teiid.metadata.FunctionMethod;
import org.teiid.metadata.MetadataStore;
import org.teiid.query.function.FunctionTree;
import org.teiid.query.function.SystemFunctionManager;
import org.teiid.query.function.UDFSource;
import org.teiid.query.function.metadata.FunctionMetadataReader;
import org.teiid.query.metadata.CompositeMetadataStore;
import org.teiid.query.metadata.TransformationMetadata;


@SuppressWarnings("nls")
public class VDBMetadataFactory {
 
  public static LRUCache<URL, TransformationMetadata> VDB_CACHE = new LRUCache<URL, TransformationMetadata>(10);
  private static MetadataStore system;
 
  public static TransformationMetadata getVDBMetadata(String vdbFile) {
    try {
      return getVDBMetadata(new File(vdbFile).toURI().toURL(), null);
    } catch (IOException e) {
      throw new TeiidRuntimeException(e);
    }
    }
 
  public static MetadataStore getSystem() {
    try {
      if (system == null) {
        system = loadMetadata(Thread.currentThread().getContextClassLoader().getResource(CoreConstants.SYSTEM_VDB)).getMetadataStore(null);
      }
      return system;
    } catch (Exception e) {
      throw new TeiidRuntimeException("System VDB not found");
    }
    }
 
  public static TransformationMetadata getVDBMetadata(URL vdbURL, URL udfFile) throws IOException {
    TransformationMetadata vdbmetadata = VDB_CACHE.get(vdbURL);
    if (vdbmetadata != null) {
      return vdbmetadata;
    }

    try {
      IndexMetadataFactory imf = loadMetadata(vdbURL);
     
      Collection <FunctionMethod> methods = null;
      Collection<FunctionTree> trees = null;
      if (udfFile != null) {
        String schema = FileUtils.getFilenameWithoutExtension(udfFile.getPath());
        methods = FunctionMetadataReader.loadFunctionMethods(udfFile.openStream());
        trees = Arrays.asList(new FunctionTree(schema, new UDFSource(methods), true));
      }
      SystemFunctionManager sfm = new SystemFunctionManager();
      vdbmetadata = new TransformationMetadata(null, new CompositeMetadataStore(Arrays.asList(getSystem(), imf.getMetadataStore(getSystem().getDatatypes()))), imf.getEntriesPlusVisibilities(), sfm.getSystemFunctions(), trees);
      VDB_CACHE.put(vdbURL, vdbmetadata);
      return vdbmetadata;
    } catch (URISyntaxException e) {
      throw new IOException(e);
    } catch (JAXBException e) {
      throw new IOException(e);
    }
    }

  public static IndexMetadataFactory loadMetadata(URL vdbURL)
      throws IOException, MalformedURLException, URISyntaxException {
    //vfs has a problem with vdbs embedded in jars in the classpath, so we'll create a temp version
    if (vdbURL.getProtocol().equals("jar")) {
      InputStream is = vdbURL.openStream();
      File temp = File.createTempFile("temp", ".vdb", new File(UnitTestUtil.getTestScratchPath()));
      temp.deleteOnExit();
      FileUtils.write(is, temp);
      vdbURL = temp.toURI().toURL();
    }
    return new IndexMetadataFactory(vdbURL);
  }

}
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