Add default attribute to launch provider schema.

The launch provider schema has a default attribute to assign a launch
provider as a default. Respective functionality is implemented in
ProfileLaunchShortcut in order to retrieve the default attribute.
Also, Perf's launch provider extension point has been updated
to reflect this change.

Change-Id: If187a6779243aefeea99fc03286bbe53323199ed
Reviewed-on: https://git.eclipse.org/r/7165
Reviewed-by: Roland Grunberg <rgrunber@redhat.com>
IP-Clean: Roland Grunberg <rgrunber@redhat.com>
Tested-by: Roland Grunberg <rgrunber@redhat.com>

3 files changed, 88 insertions, 0 deletions

diff --git a/perf/org.eclipse.linuxtools.perf/plugin.xml b/perf/org.eclipse.linuxtools.perf/plugin.xml
index 2a8d41f..4db4b15 100644
--- a/perf/org.eclipse.linuxtools.perf/plugin.xml
+++ b/perf/org.eclipse.linuxtools.perf/plugin.xml
@@ -135,6 +135,7 @@
    <extension
          point="org.eclipse.linuxtools.profiling.launch.launchProvider">
       <provider
+            default="true"
             delegate="org.eclipse.linuxtools.internal.perf.launch.PerfLaunchConfigDelegate"
             id="org.eclipse.linuxtools.perf.provider"
             name="Perf"
diff --git a/profiling/org.eclipse.linuxtools.profiling.launch/schema/org.eclipse.linuxtools.profiling.launch.provider.exsd b/profiling/org.eclipse.linuxtools.profiling.launch/schema/org.eclipse.linuxtools.profiling.launch.provider.exsd
index 811a522..6af63a7 100644
--- a/profiling/org.eclipse.linuxtools.profiling.launch/schema/org.eclipse.linuxtools.profiling.launch.provider.exsd
+++ b/profiling/org.eclipse.linuxtools.profiling.launch/schema/org.eclipse.linuxtools.profiling.launch.provider.exsd
@@ -108,6 +108,13 @@ Invalid values will be assigned the lowest priority to the extension.
                </documentation>
             </annotation>
          </attribute>
+         <attribute name="default" type="boolean" use="required">
+            <annotation>
+               <documentation>
+                  If true, this launch provider is set as default for the given type.
+               </documentation>
+            </annotation>
+         </attribute>
       </complexType>
    </element>
 
diff --git a/profiling/org.eclipse.linuxtools.profiling.launch/src/org/eclipse/linuxtools/profiling/launch/ProfileLaunchShortcut.java b/profiling/org.eclipse.linuxtools.profiling.launch/src/org/eclipse/linuxtools/profiling/launch/ProfileLaunchShortcut.java
index 58c43fc..1512500 100644
--- a/profiling/org.eclipse.linuxtools.profiling.launch/src/org/eclipse/linuxtools/profiling/launch/ProfileLaunchShortcut.java
+++ b/profiling/org.eclipse.linuxtools.profiling.launch/src/org/eclipse/linuxtools/profiling/launch/ProfileLaunchShortcut.java
@@ -152,6 +152,86 @@ public abstract class ProfileLaunchShortcut implements ILaunchShortcut {
 	}
 
 	/**
+	 * Get id of default profiling launch shortcut that provides the type 
+	 * of profiling. This looks through extensions of the
+	 * <code>org.eclipse.linuxtools.profiling.launch.launchProvider</code>
+	 * extension point that have a specific type attribute.
+	 *
+	 * @param type A profiling type (eg. memory, snapshot, timing, etc.)
+	 * @return an id of the profiling launch shortcut that implements
+	 * <code>ProfileLaunchShortcut</code> and provides the necessary
+	 * profiling type, or <code>null</code> if none could be found.
+	 * @since 1.2
+	 */
+	public static String getDefaultLaunchShortcutProviderId(String type) {
+		IExtensionPoint extPoint = Platform.getExtensionRegistry()
+				.getExtensionPoint(ProfileLaunchPlugin.PLUGIN_ID,
+						"launchProvider"); //$NON-NLS-1$
+		IConfigurationElement[] configs = extPoint.getConfigurationElements();
+		for (IConfigurationElement config : configs) {
+			if (config.getName().equals("provider")) { //$NON-NLS-1$
+				String currentType = config.getAttribute("type"); //$NON-NLS-1$
+				String shortcut = config.getAttribute("shortcut"); //$NON-NLS-1$
+				if (currentType != null && shortcut != null
+						&& currentType.equals(type)) {
+					String isDefault = config.getAttribute("default");
+					if (isDefault != null && isDefault.equals("true")) {
+						try {
+							Object obj = config
+									.createExecutableExtension("shortcut"); //$NON-NLS-1$
+							if (obj instanceof ProfileLaunchShortcut) {
+								return config.getAttribute("id");
+							}
+						} catch (CoreException e) {
+							// continue, perhaps another configuration will
+							// succeed
+						}
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Get a profiling launch shortcut that is associated with the specified id.
+	 * This looks through extensions of the extension point
+	 * <code>org.eclipse.linuxtools.profiling.launch.launchProvider</code> 
+	 * that have a specific id.
+	 *
+	 * @param id A unique identifier
+	 * @return a profiling launch shortcut that implements <code>ProfileLaunchShortcut</code>
+	 * and provides the necessary profiling type, or <code>null</code> if none could be found.
+	 * @since 1.2
+	 */
+	public static ProfileLaunchShortcut getLaunchShortcutProviderFromId(
+			String id) {
+		IExtensionPoint extPoint = Platform.getExtensionRegistry()
+				.getExtensionPoint(ProfileLaunchPlugin.PLUGIN_ID,
+						"launchProvider"); //$NON-NLS-1$
+		IConfigurationElement[] configs = extPoint.getConfigurationElements();
+		for (IConfigurationElement config : configs) {
+			if (config.getName().equals("provider")) { //$NON-NLS-1$
+				String currentId = config.getAttribute("id"); //$NON-NLS-1$
+				String shortcut = config.getAttribute("shortcut"); //$NON-NLS-1$
+				if (currentId != null && shortcut != null
+						&& currentId.equals(id)) {
+					try {
+						Object obj = config
+								.createExecutableExtension("shortcut"); //$NON-NLS-1$
+						if (obj instanceof ProfileLaunchShortcut) {
+							return (ProfileLaunchShortcut) obj;
+						}
+					} catch (CoreException e) {
+						// continue, perhaps another configuration will succeed
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	/**
 	 * Locate a configuration to relaunch for the given type.  If one cannot be found, create one.
 	 * 
 	 * @return a re-useable config or <code>null</code> if none