1 files changed, 73 insertions, 0 deletions
diff --git a/predicate-search/src/main/java/com/yahoo/search/predicate/index/ZeroConstraintPostingList.java b/predicate-search/src/main/java/com/yahoo/search/predicate/index/ZeroConstraintPostingList.java
new file mode 100644
index 00000000000..0dcd6533b34
--- /dev/null
+++ b/predicate-search/src/main/java/com/yahoo/search/predicate/index/ZeroConstraintPostingList.java
@@ -0,0 +1,73 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.predicate.index;
+
+import com.yahoo.search.predicate.SubqueryBitmap;
+
+/**
+ * Wraps an int stream of document ids into a PostingList.
+ * All documents in the stream are considered matches.
+ * @author <a href="mailto:magnarn@yahoo-inc.com">Magnar Nedland</a>
+ * @author bjorncs
+ */
+public class ZeroConstraintPostingList implements PostingList {
+    private final int[] docIds;
+    private final int length;
+    private int currentIndex;
+    private int currentDocId;
+
+    public ZeroConstraintPostingList(int[] docIds) {
+        this.docIds = docIds;
+        this.currentIndex = 0;
+        this.currentDocId = -1;
+        this.length = docIds.length;
+    }
+
+    @Override
+    public boolean nextDocument(int docId) {
+        int currentDocId = this.currentDocId;
+        while (currentIndex < length && currentDocId <= docId) {
+            currentDocId = docIds[currentIndex++];
+        }
+        if (currentDocId <= docId) {
+            return false;
+        }
+        this.currentDocId = currentDocId;
+        return true;
+    }
+
+    @Override
+    public boolean prepareIntervals() {
+        return true;
+    }
+
+    @Override
+    public boolean nextInterval() {
+        return false;
+    }
+
+    @Override
+    public int size() {
+        return length;
+    }
+
+    @Override
+    public int getInterval() {
+        return Interval.fromBoundaries(1, Interval.ZERO_CONSTRAINT_RANGE);
+    }
+
+    @Override
+    public int getDocId() {
+        return currentDocId;
+    }
+
+    @Override
+    public long getSubquery() {
+        return SubqueryBitmap.ALL_SUBQUERIES;
+    }
+
+    @Override
+    public int[] getDocIds() {
+        return docIds;
+    }
+
+}