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diff --git a/container-search/src/main/java/com/yahoo/prelude/fastsearch/DocsumDefinition.java b/container-search/src/main/java/com/yahoo/prelude/fastsearch/DocsumDefinition.java
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+++ b/container-search/src/main/java/com/yahoo/prelude/fastsearch/DocsumDefinition.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.prelude.fastsearch;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.yahoo.vespa.config.search.SummaryConfig;
+import com.yahoo.container.search.LegacyEmulationConfig;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A docsum definition which knows how to decode a certain class of document
+ * summaries. The docsum definition has a name and a list of field definitions
+ *
+ * @author bratseth
+ * @author Bjørn Borud
+ */
+public class DocsumDefinition {
+
+    private String name;
+    private final List<DocsumField> fields;
+
+    /** True if this contains dynamic fields */
+    private boolean dynamic = false;
+
+    // Mapping between field names and their index in this.fields
+    private final Map<String,Integer> fieldNameToIndex;
+
+    DocsumDefinition(DocumentdbInfoConfig.Documentdb.Summaryclass config, LegacyEmulationConfig emulConfig) {
+        this.name = config.name();
+        List<DocsumField> fieldsBuilder = new ArrayList<>();
+        Map<String,Integer> fieldNameToIndexBuilder = new HashMap<>();
+
+        for (DocumentdbInfoConfig.Documentdb.Summaryclass.Fields field : config.fields()) {
+            // no, don't switch the order of the two next lines :)
+            fieldNameToIndexBuilder.put(field.name(), fieldsBuilder.size());
+            fieldsBuilder.add(DocsumField.create(field.name(), field.type(), emulConfig));
+            if (field.dynamic())
+                dynamic = true;
+        }
+        fields = ImmutableList.copyOf(fieldsBuilder);
+        fieldNameToIndex = ImmutableMap.copyOf(fieldNameToIndexBuilder);
+    }
+
+    /** Returns the field at this index, or null if none */
+    public DocsumField getField(int fieldIndex) {
+        if (fieldIndex >= fields.size()) return null;
+        return fields.get(fieldIndex);
+    }
+
+    /** Returns the index of a field name */
+    public Integer getFieldIndex(String fieldName) {
+        return fieldNameToIndex.get(fieldName);
+    }
+
+    @Override
+    public String toString() {
+        return "docsum definition '" + getName() + "'";
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getFieldCount() {
+        return fields.size();
+    }
+
+    public List<DocsumField> getFields() {
+        return fields;
+    }
+
+    /** Returns whether this summary contains one or more dynamic fields */
+    public boolean isDynamic() {
+        return dynamic;
+    }
+
+}