From ee198517ee566006f73ae7ec5a47d011cfa12d9c Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Thu, 29 Sep 2011 16:56:53 +0000
Subject: [PATCH] Introduce JCR preference store

git-svn-id: https://svn.argeo.org/commons/trunk@4767 4cfe0d0a-d680-48aa-b62c-e0a02a3f76cc
---
 .../eclipse/ui/jcr/JcrPreferenceStore.java    | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 eclipse/runtime/org.argeo.eclipse.ui.jcr/src/main/java/org/argeo/eclipse/ui/jcr/JcrPreferenceStore.java

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
index 000000000..f8dc23f47
--- /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;
+	}
+
+}
-- 
2.30.2