001package org.hl7.fhir.dstu2.terminologies;
002
003/*
004  Copyright (c) 2011+, HL7, Inc.
005  All rights reserved.
006  
007  Redistribution and use in source and binary forms, with or without modification, 
008  are permitted provided that the following conditions are met:
009    
010   * Redistributions of source code must retain the above copyright notice, this 
011     list of conditions and the following disclaimer.
012   * Redistributions in binary form must reproduce the above copyright notice, 
013     this list of conditions and the following disclaimer in the documentation 
014     and/or other materials provided with the distribution.
015   * Neither the name of HL7 nor the names of its contributors may be used to 
016     endorse or promote products derived from this software without specific 
017     prior written permission.
018  
019  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028  POSSIBILITY OF SUCH DAMAGE.
029  
030 */
031
032/*
033Copyright (c) 2011+, HL7, Inc
034All rights reserved.
035
036Redistribution and use in source and binary forms, with or without modification, 
037are permitted provided that the following conditions are met:
038
039 * Redistributions of source code must retain the above copyright notice, this 
040   list of conditions and the following disclaimer.
041 * Redistributions in binary form must reproduce the above copyright notice, 
042   this list of conditions and the following disclaimer in the documentation 
043   and/or other materials provided with the distribution.
044 * Neither the name of HL7 nor the names of its contributors may be used to 
045   endorse or promote products derived from this software without specific 
046   prior written permission.
047
048THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
049ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
050WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
051IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
052INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
053NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
054PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
055WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
056ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
057POSSIBILITY OF SUCH DAMAGE.
058
059*/
060
061import java.io.File;
062import java.io.FileInputStream;
063import java.io.FileOutputStream;
064import java.io.IOException;
065import java.util.HashMap;
066import java.util.Map;
067
068import org.apache.commons.io.IOUtils;
069import org.hl7.fhir.dstu2.formats.IParser.OutputStyle;
070import org.hl7.fhir.dstu2.model.OperationOutcome;
071import org.hl7.fhir.dstu2.model.Resource;
072import org.hl7.fhir.dstu2.model.ValueSet;
073import org.hl7.fhir.dstu2.terminologies.ValueSetExpander.ValueSetExpansionOutcome;
074import org.hl7.fhir.dstu2.utils.IWorkerContext;
075import org.hl7.fhir.dstu2.utils.ToolingExtensions;
076import org.hl7.fhir.exceptions.FHIRFormatError;
077import org.hl7.fhir.utilities.Utilities;
078import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
079import org.hl7.fhir.utilities.xhtml.XhtmlComposer;
080
081@Deprecated
082public class ValueSetExpansionCache implements ValueSetExpanderFactory {
083
084  public class CacheAwareExpander implements ValueSetExpander {
085
086    @Override
087    public ValueSetExpansionOutcome expand(ValueSet source) throws ETooCostly, IOException {
088      if (expansions.containsKey(source.getUrl()))
089        return expansions.get(source.getUrl());
090      ValueSetExpander vse = new ValueSetExpanderSimple(context, ValueSetExpansionCache.this);
091      ValueSetExpansionOutcome vso = vse.expand(source);
092      if (vso.getError() != null) {
093        // well, we'll see if the designated server can expand it, and if it can, we'll
094        // cache it locally
095        vso = context.expandVS(source, false);
096        FileOutputStream s = ManagedFileAccess.outStream(Utilities.path(cacheFolder, makeFile(source.getUrl())));
097        context.newXmlParser().setOutputStyle(OutputStyle.PRETTY).compose(s, vso.getValueset());
098        s.close();
099      }
100      expansions.put(source.getUrl(), vso);
101      return vso;
102    }
103
104    private String makeFile(String url) {
105      return url.replace("$", "").replace(":", "").replace("//", "/").replace("/", "_") + ".xml";
106    }
107  }
108
109  private static final String VS_ID_EXT = "http://tools/cache";
110
111  private final Map<String, ValueSetExpansionOutcome> expansions = new HashMap<String, ValueSetExpansionOutcome>();
112  private final IWorkerContext context;
113  private final String cacheFolder;
114
115  public ValueSetExpansionCache(IWorkerContext context) {
116    super();
117    cacheFolder = null;
118    this.context = context;
119  }
120
121  public ValueSetExpansionCache(IWorkerContext context, String cacheFolder) throws FHIRFormatError, IOException {
122    super();
123    this.context = context;
124    this.cacheFolder = cacheFolder;
125    if (this.cacheFolder != null)
126      loadCache();
127  }
128
129  private void loadCache() throws FHIRFormatError, IOException {
130    File[] files = ManagedFileAccess.file(cacheFolder).listFiles();
131    for (File f : files) {
132      if (f.getName().endsWith(".xml")) {
133        final FileInputStream is = ManagedFileAccess.inStream(f);
134        try {
135          Resource r = context.newXmlParser().setOutputStyle(OutputStyle.PRETTY).parse(is);
136          if (r instanceof OperationOutcome) {
137            OperationOutcome oo = (OperationOutcome) r;
138            expansions.put(ToolingExtensions.getExtension(oo, VS_ID_EXT).getValue().toString(),
139                new ValueSetExpansionOutcome(new XhtmlComposer(true, false).composePlainText(oo.getText().getDiv())));
140          } else {
141            ValueSet vs = (ValueSet) r;
142            expansions.put(vs.getUrl(), new ValueSetExpansionOutcome(vs, null));
143          }
144        } finally {
145          IOUtils.closeQuietly(is);
146        }
147      }
148    }
149  }
150
151  @Override
152  public ValueSetExpander getExpander() {
153    return new CacheAwareExpander();
154    // return new ValueSetExpander(valuesets, codesystems);
155  }
156
157}