From db2de9140b9487e8aa26bbd4ba1aedcad4ecc990 Mon Sep 17 00:00:00 2001
From: Arne Juul <arnej@yahooinc.com>
Date: Tue, 16 May 2023 11:06:12 +0000
Subject: allow short-form JSON for 1-d constants

---
 .../validation/ConstantTensorJsonValidator.java    | 76 +++++++++++++++++++---
 1 file changed, 66 insertions(+), 10 deletions(-)

(limited to 'config-model/src/main')

diff --git a/config-model/src/main/java/com/yahoo/vespa/model/application/validation/ConstantTensorJsonValidator.java b/config-model/src/main/java/com/yahoo/vespa/model/application/validation/ConstantTensorJsonValidator.java
index 66da43856b1..eccb6910866 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/application/validation/ConstantTensorJsonValidator.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/application/validation/ConstantTensorJsonValidator.java
@@ -28,11 +28,14 @@ public class ConstantTensorJsonValidator {
     private static final String FIELD_CELLS = "cells";
     private static final String FIELD_ADDRESS = "address";
     private static final String FIELD_VALUE = "value";
+    private static final String FIELD_VALUES = "values";
 
     private static final JsonFactory jsonFactory = new JsonFactory();
 
     private JsonParser parser;
     private Map<String, TensorType.Dimension> tensorDimensions;
+    private boolean isSingleDenseType = false;
+    private boolean isSingleMappedType = false;
 
     public void validate(String fileName, TensorType type, Reader tensorData) {
         if (fileName.endsWith(".json")) {
@@ -57,19 +60,69 @@ public class ConstantTensorJsonValidator {
                     .dimensions()
                     .stream()
                     .collect(Collectors.toMap(TensorType.Dimension::name, Function.identity()));
+            if (type.dimensions().size() == 1) {
+                this.isSingleMappedType = (type.indexedSubtype() == TensorType.empty);
+                this.isSingleDenseType = (type.mappedSubtype() == TensorType.empty);
+            }
+            var top = parser.nextToken();
+            if (top == JsonToken.START_ARRAY) {
+                consumeValuesArray();
+            } else if (top == JsonToken.START_OBJECT) {
+                consumeTopObject();
+            }
+        });
+    }
 
-            assertNextTokenIs(JsonToken.START_OBJECT);
-            assertNextTokenIs(JsonToken.FIELD_NAME);
-            assertFieldNameIs(FIELD_CELLS);
+    private void consumeValuesArray() throws IOException {
+        if (! isSingleDenseType) {
+            throw new InvalidConstantTensorException(parser, String.format("Field 'values' is only valid for simple vectors (1-d dense tensors"));
+        }
+        assertCurrentTokenIs(JsonToken.START_ARRAY);
+        while (parser.nextToken() != JsonToken.END_ARRAY) {
+            validateNumeric(parser.getCurrentToken());
+        }
+    }
 
+    private void consumeTopObject() throws IOException {
+        assertCurrentTokenIs(JsonToken.START_OBJECT);
+        assertNextTokenIs(JsonToken.FIELD_NAME);
+        String fieldName = parser.getCurrentName();
+        if (fieldName.equals(FIELD_VALUES)) {
             assertNextTokenIs(JsonToken.START_ARRAY);
+            consumeValuesArray();
+        } else if (fieldName.equals(FIELD_CELLS)) {
+            consumeCellsField();
+        } else {
+            throw new InvalidConstantTensorException(parser, String.format("Expected 'cells' or 'values', got '%s'", fieldName));
+        }
+        assertNextTokenIs(JsonToken.END_OBJECT);
+    }
 
-            while (parser.nextToken() != JsonToken.END_ARRAY) {
-                validateTensorCell();
-            }
+    private void consumeCellsField() throws IOException {
+        var token = parser.nextToken();
+        if (token == JsonToken.START_ARRAY) {
+            consumeLiteralFormArray();
+        } else if (token == JsonToken.START_OBJECT) {
+            consumeSimpleMappedObject();
+        } else {
+            throw new InvalidConstantTensorException(parser, String.format("Field 'cells' must be object or array, but got %s", token.toString()));
+        }
+    }
 
-            assertNextTokenIs(JsonToken.END_OBJECT);
-        });
+    private void consumeLiteralFormArray() throws IOException {
+        while (parser.nextToken() != JsonToken.END_ARRAY) {
+            validateTensorCell();
+        }
+    }
+
+    private void consumeSimpleMappedObject() throws IOException {
+        if (! isSingleMappedType) {
+            throw new InvalidConstantTensorException(parser, String.format("Field 'cells' must be an array of address/value objects"));
+        }
+        while (parser.nextToken() != JsonToken.END_OBJECT) {
+            assertCurrentTokenIs(JsonToken.FIELD_NAME);
+            validateTensorCellValue();
+        }
     }
 
     private void validateTensorCell() {
@@ -87,7 +140,7 @@ public class ConstantTensorJsonValidator {
                     if (fieldName.equals(FIELD_ADDRESS)) {
                         validateTensorAddress();
                     } else if (fieldName.equals(FIELD_VALUE)) {
-                        validateTensorValue();
+                        validateTensorCellValue();
                     }
                 } else {
                     throw new InvalidConstantTensorException(parser, "Only 'address' or 'value' fields are permitted within a cell object");
@@ -169,9 +222,12 @@ public class ConstantTensorJsonValidator {
         throw new InvalidConstantTensorException(parser, String.format("Index '%s' for dimension '%s' is not an integer", value, dimensionName));
     }
 
-    private void validateTensorValue() throws IOException {
+    private void validateTensorCellValue() throws IOException {
         JsonToken token = parser.nextToken();
+        validateNumeric(token);
+    }
 
+    private void validateNumeric(JsonToken token) throws IOException {
         if (token != JsonToken.VALUE_NUMBER_FLOAT && token != JsonToken.VALUE_NUMBER_INT) {
             throw new InvalidConstantTensorException(parser, String.format("Tensor value is not a number (%s)", token.toString()));
         }
-- 
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