Introduce JCR preference store

git-svn-id: https://svn.argeo.org/commons/trunk@4767 4cfe0d0a-d680-48aa-b62c-e0a02a3f76cc

diff --git a/eclipse/runtime/org.argeo.eclipse.ui.jcr/src/main/java/org/argeo/eclipse/ui/jcr/JcrPreferenceStore.java b/eclipse/runtime/org.argeo.eclipse.ui.jcr/src/main/java/org/argeo/eclipse/ui/jcr/JcrPreferenceStore.java
new file mode 100644 (file)
index 0000000..f8dc23f
--- /dev/null
+++ b/eclipse/runtime/org.argeo.eclipse.ui.jcr/src/main/java/org/argeo/eclipse/ui/jcr/JcrPreferenceStore.java
@@ -0,0 +1,99 @@
+package org.argeo.eclipse.ui.jcr;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+import javax.jcr.Node;
+import javax.jcr.Property;
+import javax.jcr.PropertyIterator;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+
+import org.apache.commons.io.IOUtils;
+import org.argeo.ArgeoException;
+import org.argeo.jcr.ArgeoNames;
+import org.argeo.jcr.JcrUtils;
+import org.eclipse.jface.preference.PreferenceStore;
+
+/** Persist preferences as key/value pairs under ~/argeo:preferences */
+public class JcrPreferenceStore extends PreferenceStore {
+       private Session session;
+
+       /** Retrieves the preference node */
+       protected Node getPreferenceNode() {
+               try {
+                       Node userHome = JcrUtils.getUserHome(session);
+                       Node preferences;
+                       if (!userHome.hasNode(ArgeoNames.ARGEO_PREFERENCES)) {
+                               preferences = userHome.addNode(ArgeoNames.ARGEO_PREFERENCES);
+                               session.save();
+                       } else {
+                               preferences = userHome.getNode(ArgeoNames.ARGEO_PREFERENCES);
+                       }
+                       return preferences;
+               } catch (RepositoryException e) {
+                       JcrUtils.discardQuietly(session);
+                       throw new ArgeoException("Cannot retrieve preferences", e);
+               }
+
+       }
+
+       @Override
+       public void load() throws IOException {
+               ByteArrayOutputStream out = null;
+               ByteArrayInputStream in = null;
+               try {
+                       Properties props = new Properties();
+                       PropertyIterator it = getPreferenceNode().getProperties();
+                       while (it.hasNext()) {
+                               Property p = it.nextProperty();
+                               if (!p.isMultiple()) {
+                                       props.setProperty(p.getName(), p.getValue().getString());
+                               }
+                       }
+                       out = new ByteArrayOutputStream();
+                       props.store(out, "");
+                       in = new ByteArrayInputStream(out.toByteArray());
+                       load(in);
+               } catch (Exception e) {
+                       throw new ArgeoException("Cannot load preferences", e);
+               } finally {
+                       IOUtils.closeQuietly(in);
+                       IOUtils.closeQuietly(out);
+               }
+       }
+
+       @Override
+       public void save() throws IOException {
+               ByteArrayOutputStream out = null;
+               ByteArrayInputStream in = null;
+               Node preferences = null;
+               try {
+                       out = new ByteArrayOutputStream();
+                       save(out, "");
+                       in = new ByteArrayInputStream(out.toByteArray());
+                       Properties props = new Properties();
+                       props.load(in);
+                       preferences = getPreferenceNode();
+                       for (Object key : props.keySet()) {
+                               String name = key.toString();
+                               String value = props.getProperty(name);
+                               preferences.setProperty(name, value);
+                       }
+                       preferences.getSession().save();
+               } catch (Exception e) {
+                       JcrUtils.discardUnderlyingSessionQuietly(preferences);
+                       throw new ArgeoException("Cannot load preferences", e);
+               } finally {
+                       IOUtils.closeQuietly(in);
+                       IOUtils.closeQuietly(out);
+               }
+       }
+
+       public void setSession(Session session) {
+               this.session = session;
+       }
+
+}