FileIconProvider: Use hash for cache, instead of list.

Change-Id: I5d633ca2d21b6352c59cdeb7cd85267ced1d2170
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/coreplugin/fileiconprovider.cpp

@@ -37,7 +37,7 @@
 #include <QStyle>
 #include <QPainter>
 #include <QFileInfo>
-#include <QPair>
+#include <QHash>
 #include <QDebug>
 
 #include <QFileIconProvider>
@@ -68,9 +68,6 @@ namespace FileIconProvider {
 
 enum { debug = 0 };
 
-typedef QPair<QString, QIcon> StringIconPair;
-typedef QList<StringIconPair> StringIconPairList;
-
 class FileIconProviderImplementation : public QFileIconProvider
 {
 public:
@@ -89,15 +86,8 @@ public:
         QTC_ASSERT(!icon.isNull() && !suffix.isEmpty(), return);
 
         const QPixmap fileIconPixmap = FileIconProvider::overlayIcon(QStyle::SP_FileIcon, icon, QSize(16, 16));
-
         // replace old icon, if it exists
-        for (int i = 0, n = m_cache.size(); i != n; ++i) {
-            if (m_cache.at(i).first == suffix) {
-                m_cache[i].second = fileIconPixmap;
-                return;
-            }
-        }
-        m_cache.append(StringIconPair(suffix, fileIconPixmap));
+        m_cache.insert(suffix, fileIconPixmap);
     }
 
     void registerIconOverlayForMimeType(const QIcon &icon, const MimeType &mimeType)
@@ -107,7 +97,7 @@ public:
     }
 
     // Mapping of file suffix to icon.
-    StringIconPairList m_cache;
+    QHash<QString, QIcon> m_cache;
 
     QIcon m_unknownFileIcon;
 };
@@ -130,10 +120,8 @@ QIcon FileIconProviderImplementation::icon(const QFileInfo &fileInfo) const
     // Check for cached overlay icons by file suffix.
     if (!m_cache.isEmpty() && !fileInfo.isDir()) {
         const QString suffix = fileInfo.suffix();
-        if (!suffix.isEmpty()) {
-            for (int i = 0, n = m_cache.size(); i != n; ++i)
-                if (m_cache.at(i).first == suffix)
-                    return m_cache[i].second;
+        if (!suffix.isEmpty() && m_cache.contains(suffix)) {
+            return m_cache.value(suffix);
         }
     }
     // Get icon from OS.