1 files changed, 66 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/Resolution.java b/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/Resolution.java
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+++ b/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/Resolution.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.pagetemplates.engine;
+
+import com.yahoo.search.pagetemplates.model.Choice;
+import com.yahoo.search.pagetemplates.model.MapChoice;
+import com.yahoo.search.pagetemplates.model.PageElement;
+
+import java.util.IdentityHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A resolution of choices within a template.
+ *
+ * @author <a href="mailto:bratseth@yahoo-inc.com">Jon Bratseth</a>
+ */
+public class Resolution {
+
+    /** A record of choices made as choice → alternative index (id) */
+    private Map<Choice,Integer> choiceResolutions=new IdentityHashMap<>();
+
+    /** A of map choices made as choice → mapping */
+    private Map<MapChoice,Map<String,List<PageElement>>> mapChoiceResolutions=
+            new IdentityHashMap<>();
+
+    public void addChoiceResolution(Choice choice,int alternativeIndex) {
+        choiceResolutions.put(choice,alternativeIndex);
+    }
+
+    public void addMapChoiceResolution(MapChoice choice, Map<String,List<PageElement>> mapping) {
+        mapChoiceResolutions.put(choice,mapping);
+    }
+
+    /**
+     * Returns the resolution of a choice.
+     *
+     * @return the (0-base) index of the choice made. If the given choice has exactly one alternative,
+     *         0 is always returned (whether or not the choice has been attempted resolved).
+     * @throws IllegalArgumentException if the choice is empty, or if it has multiple alternatives but have not
+     *         been resolved in this
+     */
+    public int getResolution(Choice choice) {
+        if (choice.alternatives().size()==1) return 0;
+        if (choice.isEmpty()) throw new IllegalArgumentException("Cannot return a resolution of empty " + choice);
+        Integer resolution=choiceResolutions.get(choice);
+        if (resolution==null) throw new IllegalArgumentException(this + " has no resolution of " + choice);
+        return resolution;
+    }
+
+    /**
+     * Returns the resolution of a map choice.
+     *
+     * @return the chosen mapping - entries from placeholder id to the values to use at the location of that placeholder
+     * @throws IllegalArgumentException if this choice has not been resolved in this
+     */
+    public Map<String,List<PageElement>> getResolution(MapChoice choice) {
+        Map<String,List<PageElement>> resolution=mapChoiceResolutions.get(choice);
+        if (resolution==null) throw new IllegalArgumentException(this + " has no resolution of " + choice);
+        return resolution;
+    }
+
+    public @Override String toString() {
+        return "a resolution of " + choiceResolutions.size() + " choices";
+    }
+
+}