1 files changed, 56 insertions, 0 deletions
diff --git a/gerrit-index/src/main/java/com/google/gerrit/index/QueryOptions.java b/gerrit-index/src/main/java/com/google/gerrit/index/QueryOptions.java
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+++ b/gerrit-index/src/main/java/com/google/gerrit/index/QueryOptions.java
@@ -0,0 +1,56 @@
+// Copyright (C) 2015 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.google.gerrit.index;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.primitives.Ints;
+import java.util.Set;
+
+@AutoValue
+public abstract class QueryOptions {
+  public static QueryOptions create(IndexConfig config, int start, int limit, Set<String> fields) {
+    checkArgument(start >= 0, "start must be nonnegative: %s", start);
+    checkArgument(limit > 0, "limit must be positive: %s", limit);
+    return new AutoValue_QueryOptions(config, start, limit, ImmutableSet.copyOf(fields));
+  }
+
+  public QueryOptions convertForBackend() {
+    // Increase the limit rather than skipping, since we don't know how many
+    // skipped results would have been filtered out by the enclosing AndSource.
+    int backendLimit = config().maxLimit();
+    int limit = Ints.saturatedCast((long) limit() + start());
+    limit = Math.min(limit, backendLimit);
+    return create(config(), 0, limit, fields());
+  }
+
+  public abstract IndexConfig config();
+
+  public abstract int start();
+
+  public abstract int limit();
+
+  public abstract ImmutableSet<String> fields();
+
+  public QueryOptions withLimit(int newLimit) {
+    return create(config(), start(), newLimit, fields());
+  }
+
+  public QueryOptions withStart(int newStart) {
+    return create(config(), newStart, limit(), fields());
+  }
+}