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Merge "Precompute cursor indexes in DocumentsUI and improve perf by 2.7%." into nyc-dev

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This commit is contained in:
Tomasz Mikolajewski
2016-03-16 09:25:28 +00:00
committed by Android (Google) Code Review
parent 6b7c9ec19c d35a974b76
commit 54f264fcdb
1 changed files with 30 additions and 26 deletions
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56
packages/DocumentsUI/src/com/android/documentsui/dirlist/Model.java
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@@ -20,8 +20,6 @@ import static com.android.documentsui.Shared.DEBUG;
import static com.android.documentsui.State.SORT_ORDER_DISPLAY_NAME;
import static com.android.documentsui.State.SORT_ORDER_LAST_MODIFIED;
import static com.android.documentsui.State.SORT_ORDER_SIZE;
import static com.android.documentsui.model.DocumentInfo.getCursorLong;
import static com.android.documentsui.model.DocumentInfo.getCursorString;
import android.database.Cursor;
import android.os.Bundle;
@@ -62,24 +60,17 @@ public class Model {
private String mIds[] = new String[0];
private int mSortOrder = SORT_ORDER_DISPLAY_NAME;
private int mAuthorityIndex = -1;
private int mDocIdIndex = -1;
private int mMimeTypeIndex = -1;
private int mDisplayNameIndex = -1;
private int mColumnSizeIndex = -1;
private int mLastModifiedIndex = -1;
@Nullable String info;
@Nullable String error;
@Nullable DocumentInfo doc;
/**
* Generates a Model ID for a cursor entry that refers to a document. The Model ID is a unique
* string that can be used to identify the document referred to by the cursor.
*
* @param c A cursor that refers to a document.
*/
private static String createModelId(Cursor c) {
// TODO: Maybe more efficient to use just the document ID, in cases where there is only one
// authority (which should be the majority of cases).
return createModelId(
getCursorString(c, RootCursorWrapper.COLUMN_AUTHORITY),
getCursorString(c, Document.COLUMN_DOCUMENT_ID));
}
/**
* Generates a Model ID for a cursor entry that refers to a document. The Model ID is a unique
* string that can be used to identify the document referred to by the cursor.
@@ -127,6 +118,13 @@ public class Model {
mCursor = result.cursor;
mCursorCount = mCursor.getCount();
mSortOrder = result.sortOrder;
mAuthorityIndex = mCursor.getColumnIndex(RootCursorWrapper.COLUMN_AUTHORITY);
assert(mAuthorityIndex != -1);
mDocIdIndex = mCursor.getColumnIndex(Document.COLUMN_DOCUMENT_ID);
mMimeTypeIndex = mCursor.getColumnIndex(Document.COLUMN_MIME_TYPE);
mDisplayNameIndex = mCursor.getColumnIndex(Document.COLUMN_DISPLAY_NAME);
mColumnSizeIndex = mCursor.getColumnIndex(Document.COLUMN_SIZE);
doc = result.doc;
updateModelData();
@@ -173,22 +171,24 @@ public class Model {
for (int pos = 0; pos < mCursorCount; ++pos) {
mCursor.moveToNext();
positions[pos] = pos;
mIds[pos] = createModelId(mCursor);
mimeType = getCursorString(mCursor, Document.COLUMN_MIME_TYPE);
// Generates a Model ID for a cursor entry that refers to a document. The Model ID is a
// unique string that can be used to identify the document referred to by the cursor.
mIds[pos] = createModelId(getString(mAuthorityIndex), getString(mDocIdIndex));
mimeType = getString(mMimeTypeIndex);
isDirs[pos] = Document.MIME_TYPE_DIR.equals(mimeType);
switch(mSortOrder) {
switch (mSortOrder) {
case SORT_ORDER_DISPLAY_NAME:
final String displayName = getCursorString(
mCursor, Document.COLUMN_DISPLAY_NAME);
displayNames[pos] = displayName;
displayNames[pos] = getString(mDisplayNameIndex);
break;
case SORT_ORDER_LAST_MODIFIED:
longValues[pos] = getLastModified(mCursor);
longValues[pos] = getLastModified();
break;
case SORT_ORDER_SIZE:
longValues[pos] = getCursorLong(mCursor, Document.COLUMN_SIZE);
longValues[pos] = mColumnSizeIndex != -1
? mCursor.getLong(mColumnSizeIndex) : 0;
break;
}
}
@@ -364,13 +364,17 @@ public class Model {
}
}
private String getString(int columnIndex) {
return columnIndex != -1 ? mCursor.getString(columnIndex) : null;
}
/**
* @return Timestamp for the given document. Some docs (e.g. active downloads) have a null
* timestamp - these will be replaced with MAX_LONG so that such files get sorted to the top
* when sorting by date.
*/
long getLastModified(Cursor cursor) {
long l = getCursorLong(mCursor, Document.COLUMN_LAST_MODIFIED);
private long getLastModified() {
long l = mCursor.getLong(mLastModifiedIndex);
return (l == -1) ? Long.MAX_VALUE : l;
}