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.NamespaceUtils;
  23 import org.argeo.api.acr.RuntimeNamespaceContext;
  24 import org.argeo.api.acr.spi.ContentProvider;
  25 import org.argeo.api.acr.spi.ProvidedContent;
  26 import org.argeo.api.acr.spi.ProvidedRepository;
  27 import org.argeo.api.cms.CmsLog;
  28 import org.argeo.cms.acr.xml.DomContentProvider;
  29 import org.argeo.cms.acr.xml.DomUtils;
  30 import org.w3c.dom.DOMException;
  31 import org.w3c.dom.Document;
  32 import org.w3c.dom.Element;
  33 import org.xml.sax.SAXException;
  34
  35 /**
  36  * Base implementation of a {@link ProvidedRepository}.
  37  */
  38 public abstract class AbstractContentRepository implements ProvidedRepository {
  39         private final static CmsLog log = CmsLog.getLog(AbstractContentRepository.class);
  40
  41         private MountManager mountManager;
  42         private TypesManager typesManager;
  43
  44         private CmsContentSession systemSession;
  45
  46         private Set<ContentProvider> providersToAdd = new HashSet<>();
  47
  48         // utilities
  49         /** Should be used only to copy source and results. */
  50         private TransformerFactory identityTransformerFactory = TransformerFactory.newInstance();
  51
  52 //      public final static String ACR_MOUNT_PATH_PROPERTY = "acr.mount.path";
  53
  54         public AbstractContentRepository() {
  55                 // types
  56                 typesManager = new TypesManager();
  57                 typesManager.init();
  58                 Set<QName> types = typesManager.listTypes();
  59                 if (log.isTraceEnabled())
  60                         for (QName type : types) {
  61                                 log.trace(type + " - " + typesManager.getAttributeTypes(type));
  62                         }
  63
  64         }
  65
  66         protected abstract CmsContentSession newSystemSession();
  67
  68         public void start() {
  69                 systemSession = newSystemSession();
  70                 // mounts
  71                 mountManager = new MountManager(systemSession);
  72         }
  73
  74         public void stop() {
  75                 systemSession.close();
  76                 systemSession = null;
  77         }
  78
  79         /*
  80          * REPOSITORY
  81          */
  82         @Override
  83         public void addProvider(ContentProvider provider) {
  84                 if (mountManager == null)
  85                         providersToAdd.add(provider);
  86                 else
  87                         mountManager.addStructuralContentProvider(provider);
  88         }
  89
  90         public void registerTypes(String prefix, String namespaceURI, String schemaSystemId) {
  91                 typesManager.registerTypes(prefix, namespaceURI, schemaSystemId);
  92         }
  93
  94         /*
  95          * FACTORIES
  96          */
  97         public void initRootContentProvider(Path path) {
  98                 try {
  99 //                      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 100 //                      factory.setNamespaceAware(true);
 101 //                      factory.setXIncludeAware(true);
 102 //                      factory.setSchema(contentTypesManager.getSchema());
 103 //
 104                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
 105
 106                         Document document;
 107 //                      if (path != null && Files.exists(path)) {
 108 //                              InputSource inputSource = new InputSource(path.toAbsolutePath().toUri().toString());
 109 //                              inputSource.setEncoding(StandardCharsets.UTF_8.name());
 110 //                              // TODO public id as well?
 111 //                              document = dBuilder.parse(inputSource);
 112 //                      } else {
 113                         document = dBuilder.newDocument();
 114                         Element root = document.createElementNS(CrName.CR_NAMESPACE_URI,
 115                                         NamespaceUtils.toPrefixedName(CrName.root.qName()));
 116
 117                         for (String prefix : RuntimeNamespaceContext.getPrefixes().keySet()) {
 118 //                              root.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLConstants.XMLNS_ATTRIBUTE + ":" + prefix,
 119 //                                              contentTypesManager.getPrefixes().get(prefix));
 120                                 DomUtils.addNamespace(root, prefix,
 121                                                 RuntimeNamespaceContext.getNamespaceContext().getNamespaceURI(prefix));
 122                         }
 123
 124                         document.appendChild(root);
 125
 126                         // write it
 127                         if (path != null) {
 128                                 try (OutputStream out = Files.newOutputStream(path)) {
 129                                         writeDom(document, out);
 130                                 }
 131                         }
 132 //                      }
 133
 134                         String mountPath = "/";
 135                         DomContentProvider contentProvider = new DomContentProvider(mountPath, document);
 136                         addProvider(contentProvider);
 137                 } catch (DOMException | IOException e) {
 138                         throw new IllegalStateException("Cannot init ACR root " + path, e);
 139                 }
 140
 141                 // add content providers already notified
 142                 for (ContentProvider contentProvider : providersToAdd)
 143                         addProvider(contentProvider);
 144                 providersToAdd.clear();
 145         }
 146
 147         public void writeDom(Document document, OutputStream out) throws IOException {
 148                 try {
 149                         Transformer transformer = identityTransformerFactory.newTransformer();
 150                         transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 151                         transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 152
 153                         DOMSource source = new DOMSource(document);
 154                         typesManager.validate(source);
 155                         StreamResult result = new StreamResult(out);
 156                         transformer.transform(source, result);
 157                 } catch (TransformerException e) {
 158                         throw new IOException("Cannot write dom", e);
 159                 }
 160         }
 161
 162         /*
 163          * MOUNT MANAGEMENT
 164          */
 165
 166         @Override
 167         public ContentProvider getMountContentProvider(Content mountPoint, boolean initialize, QName... types) {
 168                 String mountPath = mountPoint.getPath();
 169                 // TODO check consistency with types
 170
 171                 return mountManager.getOrAddMountedProvider(mountPath, (path) -> {
 172                         DocumentBuilder dBuilder = typesManager.newDocumentBuilder();
 173                         Document document;
 174                         if (initialize) {
 175                                 QName firstType = types[0];
 176                                 document = dBuilder.newDocument();
 177                                 String prefix = ((ProvidedContent) mountPoint).getSession().getPrefix(firstType.getNamespaceURI());
 178                                 Element root = document.createElementNS(firstType.getNamespaceURI(),
 179                                                 prefix + ":" + firstType.getLocalPart());
 180                                 DomUtils.addNamespace(root, prefix, firstType.getNamespaceURI());
 181                                 document.appendChild(root);
 182                         } else {
 183                                 try (InputStream in = mountPoint.open(InputStream.class)) {
 184                                         document = dBuilder.parse(in);
 185                                         // TODO check consistency with types
 186                                 } catch (IOException | SAXException e) {
 187                                         throw new IllegalStateException("Cannot load mount from " + mountPoint, e);
 188                                 }
 189                         }
 190                         DomContentProvider contentProvider = new DomContentProvider(path, document);
 191                         return contentProvider;
 192                 });
 193         }
 194
 195         @Override
 196         public boolean shouldMount(QName... types) {
 197                 if (types.length == 0)
 198                         return false;
 199                 QName firstType = types[0];
 200                 Set<QName> registeredTypes = typesManager.listTypes();
 201                 if (registeredTypes.contains(firstType))
 202                         return true;
 203                 return false;
 204         }
 205
 206         MountManager getMountManager() {
 207                 return mountManager;
 208         }
 209
 210         TypesManager getTypesManager() {
 211                 return typesManager;
 212         }
 213 }