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1 files changed, 69 insertions, 0 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/pagetemplates/model/MapChoice.java b/container-search/src/main/java/com/yahoo/search/pagetemplates/model/MapChoice.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.model;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A choice between different possible mapping functions of a set of values to a set of placeholder ids.
+ * A <i>resolution</i> of this choice consists of choosing a unique value for each placeholder id
+ * (hence a map choice is valid iff there are at least as many values as placeholder ids).
+ * <p>
+ * Each unique set of mappings (pairs) from values to placeholder ids is a separate possible
+ * alternative of this choice. The alternatives are not listed explicitly but are generated as needed.
+ *
+ * @author <a href="mailto:bratseth@yahoo-inc.com">Jon Bratseth</a>
+ */
+public class MapChoice extends AbstractChoice {
+
+    private List<String> placeholderIds=new ArrayList<>();
+
+    private List<List<PageElement>> values=new ArrayList<>();
+
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    @Override
+    public boolean isChoiceBetween(Class pageTemplateModelElementClass) {
+        List<PageElement> firstNonEmpty=null;
+        for (List<PageElement> value : values)
+            if (value.size()>0)
+                firstNonEmpty=value;
+        if (firstNonEmpty==null) return false;
+        return (pageTemplateModelElementClass.isAssignableFrom(firstNonEmpty.get(0).getClass()));
+    }
+
+    /**
+     * Returns the placeholder ids (the "to" of the mapping) of this as a live reference which can be modified unless
+     * this is frozen.
+     */
+    public List<String> placeholderIds() { return placeholderIds; }
+
+    /**
+     * Returns the values (the "from" of the mapping) of this as a live reference which can be modified unless
+     * this is frozen. Note that each single choice of values within this is also a list of values. This is
+     * the inner list.
+     */
+    public List<List<PageElement>> values() { return values; }
+
+    @Override
+    public void freeze() {
+        if (isFrozen()) return;
+        super.freeze();
+        placeholderIds=Collections.unmodifiableList(placeholderIds);
+        values=Collections.unmodifiableList(values);
+    }
+
+    /** Accepts a visitor to this structure */
+    public @Override void accept(PageTemplateVisitor visitor) {
+        visitor.visit(this);
+        for (List<PageElement> valueEntry : values)
+            for (PageElement value : valueEntry)
+                value.accept(visitor);
+    }
+
+    @Override
+    public String toString() {
+        return "mapping to placeholders " + placeholderIds;
+    }
+
+}