1 files changed, 77 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/SparseArrayElementAddTransform.java b/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/SparseArrayElementAddTransform.java
new file mode 100644
index 000000000..b7547bc9a
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/SparseArrayElementAddTransform.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ide.eclipse.gltrace.state.transforms;
+
+import com.android.ide.eclipse.gltrace.state.GLSparseArrayProperty;
+import com.android.ide.eclipse.gltrace.state.IGLProperty;
+
+/**
+ * A {@link SparseArrayElementAddTransform} changes given state by adding an
+ * element to a sparse array, if there is no item with the same key already.
+ */
+public class SparseArrayElementAddTransform implements IStateTransform {
+    private IGLPropertyAccessor mAccessor;
+    private int mKey;
+    private IGLProperty mOldValue;
+
+    public SparseArrayElementAddTransform(IGLPropertyAccessor accessor, int key) {
+        mAccessor = accessor;
+        mKey = key;
+    }
+
+    @Override
+    public void apply(IGLProperty currentState) {
+        GLSparseArrayProperty propertyArray = getArray(currentState);
+        if (propertyArray != null) {
+            mOldValue = propertyArray.getProperty(mKey);
+            if (mOldValue == null) {
+                // add only if there is no item with this key already present
+                propertyArray.add(mKey);
+            }
+        }
+    }
+
+    @Override
+    public void revert(IGLProperty currentState) {
+        GLSparseArrayProperty propertyArray = getArray(currentState);
+        if (propertyArray != null) {
+            if (mOldValue == null) {
+                // delete only if we actually added this key
+                propertyArray.delete(mKey);
+            }
+        }
+    }
+
+    @Override
+    public IGLProperty getChangedProperty(IGLProperty currentState) {
+        return getArray(currentState);
+    }
+
+    private GLSparseArrayProperty getArray(IGLProperty state) {
+        IGLProperty p = state;
+
+        if (mAccessor != null) {
+            p = mAccessor.getProperty(p);
+        }
+
+        if (p instanceof GLSparseArrayProperty) {
+            return (GLSparseArrayProperty) p;
+        } else {
+            return null;
+        }
+    }
+}