org.argeo.cms/src/org/argeo/cms/acr/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.HashSet;
   9 import java.util.Set;
  10
  11 import javax.xml.namespace.QName;
  12 import javax.xml.parsers.DocumentBuilder;
  13 import javax.xml.transform.OutputKeys;
  14 import javax.xml.transform.Transformer;
  15 import javax.xml.transform.TransformerException;
  16 import javax.xml.transform.TransformerFactory;
  17 import javax.xml.transform.dom.DOMSource;
  18 import javax.xml.transform.stream.StreamResult;
  19
  20 import org.argeo.api.acr.Content;
  21 import org.argeo.api.acr.CrName;
  22 import org.argeo.api.acr.spi.ContentProvider;
  23 import org.argeo.api.acr.spi.ProvidedContent;
  24 import org.argeo.api.acr.spi.ProvidedRepository;
  25 import org.argeo.api.cms.CmsLog;
  26 import org.argeo.cms.acr.xml.DomContentProvider;
  27 import org.argeo.cms.acr.xml.DomUtils;
  28 import org.w3c.dom.DOMException;
  29 import org.w3c.dom.Document;
  30 import org.w3c.dom.Element;
  31 import org.xml.sax.SAXException;
  32
  33 /**
  34  * Base implementation of a {@link ProvidedRepository}.
  35  */
  36 public abstract class AbstractContentRepository implements ProvidedRepository {
  37         private final static CmsLog log = CmsLog.getLog(AbstractContentRepository.class);
  38
  39         private MountManager mountManager;
  40         private TypesManager typesManager;
  41
  42         private CmsContentSession systemSession;
  43
  44         private Set<ContentProvider> providersToAdd = new HashSet<>();
  45
  46         // utilities
  47         /** Should be used only to copy source and results. */
  48         private TransformerFactory identityTransformerFactory = TransformerFactory.newInstance();
  49
  50         public final static String ACR_MOUNT_PATH_PROPERTY = "acr.mount.path";
  51
  52         public AbstractContentRepository() {
  53                 // types
  54                 typesManager = new TypesManager();
  55                 typesManager.init();
  56                 Set<QName> types = typesManager.listTypes();
  57                 if (log.isTraceEnabled())
  58                         for (QName type : types) {
  59                                 log.trace(type + " - " + typesManager.getAttributeTypes(type));
  60                         }
  61
  62         }
  63
  64         protected abstract CmsContentSession newSystemSession();
  65
  66         public void start() {
  67                 systemSession = newSystemSession();
  68                 // mounts
  69                 mountManager = new MountManager(systemSession);
  70         }
  71
  72         public void stop() {
  73                 systemSession.close();
  74                 systemSession = null;
  75         }
  76
  77         /*
  78          * REPOSITORY
  79          */
  80
  81         public void addProvider(ContentProvider provider) {
  82                 if (mountManager == null)
  83                         providersToAdd.add(provider);
  84                 else
  85                         mountManager.addStructuralContentProvider(provider);
  86         }
  87
  88         public void registerTypes(String prefix, String namespaceURI, String schemaSystemId) {
  89                 typesManager.registerTypes(prefix, namespaceURI, schemaSystemId);
  90         }
  91
  92         /*
  93          * FACTORIES
  94          */
  95         public void initRootContentProvider(Path path) {
  96                 try {
  97 //                      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  98 //                      factory.setNamespaceAware(true);
  99 //                      factory.setXIncludeAware(true);
 100 //                      factory.setSchema(contentTypesManager.getSchema());
 101 //
 102                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
 103
 104                         Document document;
 105 //                      if (path != null && Files.exists(path)) {
 106 //                              InputSource inputSource = new InputSource(path.toAbsolutePath().toUri().toString());
 107 //                              inputSource.setEncoding(StandardCharsets.UTF_8.name());
 108 //                              // TODO public id as well?
 109 //                              document = dBuilder.parse(inputSource);
 110 //                      } else {
 111                         document = dBuilder.newDocument();
 112                         Element root = document.createElementNS(CrName.CR_NAMESPACE_URI, CrName.ROOT.get().toPrefixedString());
 113
 114                         for (String prefix : typesManager.getPrefixes().keySet()) {
 115 //                              root.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLConstants.XMLNS_ATTRIBUTE + ":" + prefix,
 116 //                                              contentTypesManager.getPrefixes().get(prefix));
 117                                 DomUtils.addNamespace(root, prefix, typesManager.getPrefixes().get(prefix));
 118                         }
 119
 120                         document.appendChild(root);
 121
 122                         // write it
 123                         if (path != null) {
 124                                 try (OutputStream out = Files.newOutputStream(path)) {
 125                                         writeDom(document, out);
 126                                 }
 127                         }
 128 //                      }
 129
 130                         String mountPath = "/";
 131                         DomContentProvider contentProvider = new DomContentProvider(mountPath, document);
 132                         addProvider(contentProvider);
 133                 } catch (DOMException | IOException e) {
 134                         throw new IllegalStateException("Cannot init ACR root " + path, e);
 135                 }
 136
 137                 // add content providers already notified
 138                 for (ContentProvider contentProvider : providersToAdd)
 139                         addProvider(contentProvider);
 140                 providersToAdd.clear();
 141         }
 142
 143         public void writeDom(Document document, OutputStream out) throws IOException {
 144                 try {
 145                         Transformer transformer = identityTransformerFactory.newTransformer();
 146                         transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 147                         transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 148
 149                         DOMSource source = new DOMSource(document);
 150                         typesManager.validate(source);
 151                         StreamResult result = new StreamResult(out);
 152                         transformer.transform(source, result);
 153                 } catch (TransformerException e) {
 154                         throw new IOException("Cannot write dom", e);
 155                 }
 156         }
 157
 158         /*
 159          * MOUNT MANAGEMENT
 160          */
 161
 162         @Override
 163         public ContentProvider getMountContentProvider(Content mountPoint, boolean initialize, QName... types) {
 164                 String mountPath = mountPoint.getPath();
 165                 // TODO check consistency with types
 166
 167                 return mountManager.getOrAddMountedProvider(mountPath, (path) -> {
 168                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
 169                         Document document;
 170                         if (initialize) {
 171                                 QName firstType = types[0];
 172                                 document = dBuilder.newDocument();
 173                                 String prefix = ((ProvidedContent) mountPoint).getSession().getPrefix(firstType.getNamespaceURI());
 174                                 Element root = document.createElementNS(firstType.getNamespaceURI(),
 175                                                 prefix + ":" + firstType.getLocalPart());
 176                                 DomUtils.addNamespace(root, prefix, firstType.getNamespaceURI());
 177                                 document.appendChild(root);
 178                         } else {
 179                                 try (InputStream in = mountPoint.open(InputStream.class)) {
 180                                         document = dBuilder.parse(in);
 181                                         // TODO check consistency with types
 182                                 } catch (IOException | SAXException e) {
 183                                         throw new IllegalStateException("Cannot load mount from " + mountPoint, e);
 184                                 }
 185                         }
 186                         DomContentProvider contentProvider = new DomContentProvider(path, document);
 187                         return contentProvider;
 188                 });
 189         }
 190
 191         @Override
 192         public boolean shouldMount(QName... types) {
 193                 if (types.length == 0)
 194                         return false;
 195                 QName firstType = types[0];
 196                 Set<QName> registeredTypes = typesManager.listTypes();
 197                 if (registeredTypes.contains(firstType))
 198                         return true;
 199                 return false;
 200         }
 201
 202         MountManager getMountManager() {
 203                 return mountManager;
 204         }
 205
 206         TypesManager getTypesManager() {
 207                 return typesManager;
 208         }
 209 }