Added xml storage adapter bundle fragments for config persister.

[controller.git] / opendaylight / config / config-persister-directory-xml-adapter / src / main / java / org / opendaylight / controller / config / persist / storage / directory / xml / XmlDirectoryPersister.java

diff --git a/opendaylight/config/config-persister-directory-xml-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/xml/XmlDirectoryPersister.java b/opendaylight/config/config-persister-directory-xml-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/xml/XmlDirectoryPersister.java
new file mode 100644 (file)
index 0000000..f6f6de9
--- /dev/null
+++ b/opendaylight/config/config-persister-directory-xml-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/xml/XmlDirectoryPersister.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.config.persist.storage.directory.xml;
+
+import org.opendaylight.controller.config.persist.api.ConfigSnapshotHolder;
+import org.opendaylight.controller.config.persist.api.Persister;
+import org.opendaylight.controller.config.persist.storage.file.xml.model.ConfigSnapshot;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Unmarshaller;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.SortedSet;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+public class XmlDirectoryPersister implements Persister {
+    private static final Logger logger = LoggerFactory.getLogger(XmlDirectoryPersister.class);
+
+    private final File storage;
+
+    public XmlDirectoryPersister(File storage) {
+        checkArgument(storage.exists() && storage.isDirectory(), "Storage directory does not exist: " + storage);
+        this.storage = storage;
+    }
+
+    @Override
+    public void persistConfig(ConfigSnapshotHolder holder) throws IOException {
+        throw new UnsupportedOperationException("This adapter is read only. Please set readonly=true on " + getClass());
+    }
+
+    @Override
+    public List<ConfigSnapshotHolder> loadLastConfigs() throws IOException {
+        File[] filesArray = storage.listFiles();
+        if (filesArray == null || filesArray.length == 0) {
+            return Collections.emptyList();
+        }
+        List<File> sortedFiles = new ArrayList<>(Arrays.asList(filesArray));
+        Collections.sort(sortedFiles);
+        // combine all found files
+        logger.debug("Reading files in following order: {}", sortedFiles);
+
+        List<ConfigSnapshotHolder> result = new ArrayList<>();
+        for (File file : sortedFiles) {
+            logger.trace("Adding file '{}' to combined result", file);
+            ConfigSnapshotHolder h = fromXmlSnapshot(file);
+            result.add(h);
+        }
+        return result;
+    }
+
+    private ConfigSnapshotHolder fromXmlSnapshot(File file) {
+        try {
+            JAXBContext jaxbContext = JAXBContext.newInstance(ConfigSnapshot.class);
+            Unmarshaller um = jaxbContext.createUnmarshaller();
+
+            return asHolder((ConfigSnapshot) um.unmarshal(file));
+        } catch (JAXBException e) {
+            logger.warn("Unable to restore configuration snapshot from {}", file, e);
+            throw new IllegalStateException("Unable to restore configuration snapshot from " + file, e);
+        }
+    }
+
+    private ConfigSnapshotHolder asHolder(final ConfigSnapshot unmarshalled) {
+        return new ConfigSnapshotHolder() {
+            @Override
+            public String getConfigSnapshot() {
+                return unmarshalled.getConfigSnapshot();
+            }
+
+            @Override
+            public SortedSet<String> getCapabilities() {
+                return unmarshalled.getCapabilities();
+            }
+
+            @Override
+            public String toString() {
+                return unmarshalled.toString();
+            }
+        };
+    }
+
+
+    @Override
+    public void close() {
+
+    }
+
+    @Override
+    public String toString() {
+        final StringBuffer sb = new StringBuffer("XmlDirectoryPersister{");
+        sb.append("storage=").append(storage);
+        sb.append('}');
+        return sb.toString();
+    }
+}
\ No newline at end of file