AbstractContentRepository.java

   1 package org.argeo.cms.acr;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.io.OutputStream;
   6 import java.nio.file.Files;
   7 import java.nio.file.Path;
   8 import java.util.Set;
   9
  10 import javax.xml.namespace.QName;
  11 import javax.xml.parsers.DocumentBuilder;
  12 import javax.xml.transform.OutputKeys;
  13 import javax.xml.transform.Transformer;
  14 import javax.xml.transform.TransformerException;
  15 import javax.xml.transform.TransformerFactory;
  16 import javax.xml.transform.dom.DOMSource;
  17 import javax.xml.transform.stream.StreamResult;
  18
  19 import org.argeo.api.acr.Content;
  20 import org.argeo.api.acr.CrName;
  21 import org.argeo.api.acr.spi.ContentProvider;
  22 import org.argeo.api.acr.spi.ProvidedContent;
  23 import org.argeo.api.acr.spi.ProvidedRepository;
  24 import org.argeo.api.cms.CmsLog;
  25 import org.argeo.cms.acr.xml.DomContentProvider;
  26 import org.argeo.cms.acr.xml.DomUtils;
  27 import org.w3c.dom.DOMException;
  28 import org.w3c.dom.Document;
  29 import org.w3c.dom.Element;
  30 import org.xml.sax.SAXException;
  31
  32 /**
  33  * Base implementation of a {@link ProvidedRepository}.
  34  */
  35 public abstract class AbstractContentRepository implements ProvidedRepository {
  36         private final static CmsLog log = CmsLog.getLog(AbstractContentRepository.class);
  37
  38         private final MountManager mountManager;
  39         private final TypesManager typesManager;
  40
  41         private CmsContentSession systemSession;
  42
  43         // utilities
  44         /** Should be used only to copy source and results. */
  45         private TransformerFactory identityTransformerFactory = TransformerFactory.newInstance();
  46
  47         public final static String ACR_MOUNT_PATH_PROPERTY = "acr.mount.path";
  48
  49         public AbstractContentRepository() {
  50                 // types
  51                 typesManager = new TypesManager();
  52                 typesManager.init();
  53                 Set<QName> types = typesManager.listTypes();
  54                 if (log.isTraceEnabled())
  55                         for (QName type : types) {
  56                                 log.trace(type + " - " + typesManager.getAttributeTypes(type));
  57                         }
  58
  59                 systemSession = newSystemSession();
  60
  61                 // mounts
  62                 mountManager = new MountManager(systemSession);
  63
  64         }
  65
  66         protected abstract CmsContentSession newSystemSession();
  67
  68         public void start() {
  69         }
  70
  71         public void stop() {
  72
  73         }
  74
  75         /*
  76          * REPOSITORY
  77          */
  78
  79         public void addProvider(ContentProvider provider) {
  80                 mountManager.addStructuralContentProvider(provider);
  81         }
  82
  83         public void registerTypes(String prefix, String namespaceURI, String schemaSystemId) {
  84                 typesManager.registerTypes(prefix, namespaceURI, schemaSystemId);
  85         }
  86
  87         /*
  88          * FACTORIES
  89          */
  90         public void initRootContentProvider(Path path) {
  91                 try {
  92 //                      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  93 //                      factory.setNamespaceAware(true);
  94 //                      factory.setXIncludeAware(true);
  95 //                      factory.setSchema(contentTypesManager.getSchema());
  96 //
  97                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
  98
  99                         Document document;
 100 //                      if (path != null && Files.exists(path)) {
 101 //                              InputSource inputSource = new InputSource(path.toAbsolutePath().toUri().toString());
 102 //                              inputSource.setEncoding(StandardCharsets.UTF_8.name());
 103 //                              // TODO public id as well?
 104 //                              document = dBuilder.parse(inputSource);
 105 //                      } else {
 106                         document = dBuilder.newDocument();
 107                         Element root = document.createElementNS(CrName.CR_NAMESPACE_URI, CrName.ROOT.get().toPrefixedString());
 108
 109                         for (String prefix : typesManager.getPrefixes().keySet()) {
 110 //                              root.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLConstants.XMLNS_ATTRIBUTE + ":" + prefix,
 111 //                                              contentTypesManager.getPrefixes().get(prefix));
 112                                 DomUtils.addNamespace(root, prefix, typesManager.getPrefixes().get(prefix));
 113                         }
 114
 115                         document.appendChild(root);
 116
 117                         // write it
 118                         if (path != null) {
 119                                 try (OutputStream out = Files.newOutputStream(path)) {
 120                                         writeDom(document, out);
 121                                 }
 122                         }
 123 //                      }
 124
 125                         String mountPath = "/";
 126                         DomContentProvider contentProvider = new DomContentProvider(mountPath, document);
 127                         addProvider(contentProvider);
 128                 } catch (DOMException | IOException e) {
 129                         throw new IllegalStateException("Cannot init ACR root " + path, e);
 130                 }
 131
 132         }
 133
 134         public void writeDom(Document document, OutputStream out) throws IOException {
 135                 try {
 136                         Transformer transformer = identityTransformerFactory.newTransformer();
 137                         transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 138                         transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 139
 140                         DOMSource source = new DOMSource(document);
 141                         typesManager.validate(source);
 142                         StreamResult result = new StreamResult(out);
 143                         transformer.transform(source, result);
 144                 } catch (TransformerException e) {
 145                         throw new IOException("Cannot write dom", e);
 146                 }
 147         }
 148
 149         /*
 150          * MOUNT MANAGEMENT
 151          */
 152
 153         @Override
 154         public ContentProvider getMountContentProvider(Content mountPoint, boolean initialize, QName... types) {
 155                 String mountPath = mountPoint.getPath();
 156                 // TODO check consistency with types
 157
 158                 return mountManager.getOrAddMountedProvider(mountPath, (path) -> {
 159                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
 160                         Document document;
 161                         if (initialize) {
 162                                 QName firstType = types[0];
 163                                 document = dBuilder.newDocument();
 164                                 String prefix = ((ProvidedContent) mountPoint).getSession().getPrefix(firstType.getNamespaceURI());
 165                                 Element root = document.createElementNS(firstType.getNamespaceURI(),
 166                                                 prefix + ":" + firstType.getLocalPart());
 167                                 DomUtils.addNamespace(root, prefix, firstType.getNamespaceURI());
 168                                 document.appendChild(root);
 169                         } else {
 170                                 try (InputStream in = mountPoint.open(InputStream.class)) {
 171                                         document = dBuilder.parse(in);
 172                                         // TODO check consistency with types
 173                                 } catch (IOException | SAXException e) {
 174                                         throw new IllegalStateException("Cannot load mount from " + mountPoint, e);
 175                                 }
 176                         }
 177                         DomContentProvider contentProvider = new DomContentProvider(path, document);
 178                         return contentProvider;
 179                 });
 180         }
 181
 182         @Override
 183         public boolean shouldMount(QName... types) {
 184                 if (types.length == 0)
 185                         return false;
 186                 QName firstType = types[0];
 187                 Set<QName> registeredTypes = typesManager.listTypes();
 188                 if (registeredTypes.contains(firstType))
 189                         return true;
 190                 return false;
 191         }
 192
 193         MountManager getMountManager() {
 194                 return mountManager;
 195         }
 196
 197         TypesManager getTypesManager() {
 198                 return typesManager;
 199         }
 200
 201 }