From 79f305532d496f0e69b557bd177d2716aabd73be Mon Sep 17 00:00:00 2001
From: Anton Leherbauer <anton.leherbauer@windriver.com>
Date: Mon, 19 Dec 2011 15:44:08 +0100
Subject: [PATCH] Bug 367061 - Language mappings as created in a Helios project
 are ignored when imported in Indigo (backward compatibility issue)

---
 .../core/language/LanguageMappingStore.java         | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/LanguageMappingStore.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/LanguageMappingStore.java
index 09a00f89f14..29f72e6ab35 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/LanguageMappingStore.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/LanguageMappingStore.java
@@ -34,6 +34,7 @@ import org.eclipse.cdt.core.CCorePlugin;
 import org.eclipse.cdt.core.CCorePreferenceConstants;
 import org.eclipse.cdt.core.language.ProjectLanguageConfiguration;
 import org.eclipse.cdt.core.language.WorkspaceLanguageConfiguration;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
 import org.eclipse.cdt.core.settings.model.ICProjectDescription;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
 import org.eclipse.cdt.internal.core.Util;
@@ -71,6 +72,13 @@ public class LanguageMappingStore {
 		ICProjectDescription descriptor = getProjectDescription(project, false);
 		if (descriptor != null) {
 			ICStorageElement rootElement = descriptor.getStorage(LANGUAGE_MAPPING_ID, false);
+			if (rootElement == null) {
+				// bug 367061 - backwards compatibility: fallback to default configuration settings
+				ICConfigurationDescription cfgDesc = descriptor.getDefaultSettingConfiguration();
+				if (cfgDesc != null) {
+					rootElement = cfgDesc.getStorage(LANGUAGE_MAPPING_ID, false);
+				}
+			}
 			if (rootElement != null) {
 				ICStorageElement[] mappingElements = rootElement.getChildrenByName(PROJECT_MAPPINGS);
 				if (mappingElements.length > 0) {
@@ -143,6 +151,11 @@ public class LanguageMappingStore {
 
 	public void storeMappings(IProject project, ProjectLanguageConfiguration config) throws CoreException {
 		ICProjectDescription descriptor = getProjectDescription(project, true);
+		ICConfigurationDescription cfgDesc = descriptor.getDefaultSettingConfiguration();
+		// remove old storage location if any
+		if (cfgDesc != null && cfgDesc.getStorage(LANGUAGE_MAPPING_ID, false) != null) {
+			cfgDesc.removeStorage(LANGUAGE_MAPPING_ID);
+		}
 		ICStorageElement rootElement = descriptor.getStorage(LANGUAGE_MAPPING_ID, true);
 		// clear all children and settings
 		rootElement.clear();