1 files changed, 174 insertions, 0 deletions
diff --git a/plugins/org.eclipse.emf.cdo.releng.preferences/src/org/eclipse/emf/cdo/releng/preferences/impl/PreferencesURIHandlerImpl.java b/plugins/org.eclipse.emf.cdo.releng.preferences/src/org/eclipse/emf/cdo/releng/preferences/impl/PreferencesURIHandlerImpl.java
new file mode 100644
index 0000000000..dc98b11f88
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo.releng.preferences/src/org/eclipse/emf/cdo/releng/preferences/impl/PreferencesURIHandlerImpl.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2013 Eike Stepper (Berlin, Germany) 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
+ *
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ */
+package org.eclipse.emf.cdo.releng.preferences.impl;
+
+import org.eclipse.emf.cdo.releng.preferences.PreferenceNode;
+import org.eclipse.emf.cdo.releng.preferences.util.PreferencesUtil;
+
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.resource.Resource;
+import org.eclipse.emf.ecore.resource.URIConverter;
+import org.eclipse.emf.ecore.resource.impl.URIHandlerImpl;
+
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences;
+
+import org.osgi.service.prefs.BackingStoreException;
+import org.osgi.service.prefs.Preferences;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collections;
+import java.util.Map;
+
+/**
+ * @author Eike Stepper
+ */
+public class PreferencesURIHandlerImpl extends URIHandlerImpl
+{
+  private static final IEclipsePreferences ROOT = Platform.getPreferencesService().getRootNode();
+
+  @Override
+  public boolean canHandle(URI uri)
+  {
+    return "preference".equals(uri.scheme());
+  }
+
+  protected static class PreferenceAccessor
+  {
+    private final Preferences preferences;
+
+    private final String key;
+
+    public PreferenceAccessor(URI uri)
+    {
+      Preferences node = ROOT;
+      for (String name : uri.trimSegments(1).segments())
+      {
+        node = node.node(name);
+      }
+      key = uri.lastSegment();
+      preferences = node;
+    }
+
+    public String get()
+    {
+      return preferences.get(key, null);
+
+    }
+
+    public void put(String value) throws IOException
+    {
+      preferences.put(key, value);
+      flush();
+    }
+
+    public void remove() throws IOException
+    {
+      preferences.remove(key);
+      flush();
+    }
+
+    private void flush() throws IOException
+    {
+      try
+      {
+        preferences.flush();
+      }
+      catch (BackingStoreException ex)
+      {
+        throw new IOException(ex);
+      }
+    }
+  }
+
+  @Override
+  public InputStream createInputStream(URI uri, final Map<?, ?> options) throws IOException
+  {
+    if (uri.segmentCount() == 1)
+    {
+      class PreferencesInput extends InputStream implements URIConverter.Loadable
+      {
+        private PreferenceNode preferencesNode = PreferencesUtil.getRootPreferenceNode(Boolean.TRUE.equals(options
+            .get(PreferencesUtil.OPTION_SYNCHRONIZED_PREFERENCES)));
+
+        private InputStream in;
+
+        public void loadResource(Resource resource) throws IOException
+        {
+          resource.getContents().add(preferencesNode);
+        }
+
+        @Override
+        public int read() throws IOException
+        {
+          if (in == null)
+          {
+            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            preferencesNode.eResource().save(out, null);
+            in = new ByteArrayInputStream(out.toByteArray());
+          }
+          return in.read();
+        }
+      }
+
+      return new PreferencesInput();
+    }
+    URI preferencePath = uri.trimSegments(1);
+    String value = new PreferenceAccessor(preferencePath).get();
+    if (value == null)
+    {
+      throw new IOException("No preference value available for " + preferencePath);
+    }
+    return new URIConverter.ReadableInputStream(value);
+  }
+
+  @Override
+  public OutputStream createOutputStream(URI uri, Map<?, ?> options) throws IOException
+  {
+    final PreferenceAccessor accessor = new PreferenceAccessor(uri.trimSegments(1));
+    return new ByteArrayOutputStream()
+    {
+      @Override
+      public void close() throws IOException
+      {
+        accessor.put(new String(toByteArray(), "UTF-8"));
+      }
+    };
+  }
+
+  @Override
+  public void delete(URI uri, Map<?, ?> options) throws IOException
+  {
+    new PreferenceAccessor(uri.trimSegments(1)).remove();
+  }
+
+  @Override
+  public boolean exists(URI uri, Map<?, ?> options)
+  {
+    return new PreferenceAccessor(uri.trimSegments(1)).get() != null;
+  }
+
+  @Override
+  public Map<String, ?> getAttributes(URI uri, Map<?, ?> options)
+  {
+    return Collections.emptyMap();
+  }
+
+  @Override
+  public void setAttributes(URI uri, Map<String, ?> attributes, Map<?, ?> options) throws IOException
+  {
+    // Do nothing.
+  }
+}