Support GraalVM and refactor (#972)

* Add native-image properties

* Add meta schema mapper

* Only create objects if needed

* Defer some processing

* Refactor

* Refactor

* Refactor

* Refactor

* Refactor

Author: justin-tay

src/main/java/com/networknt/schema/AbstractJsonValidator.java

@@ -28,7 +28,7 @@ public abstract class AbstractJsonValidator implements JsonValidator {
     private final SchemaLocation schemaLocation;
     private final JsonNode schemaNode;
     private final JsonNodePath evaluationPath;
-    private final Keyword keyword;
+    private final String keyword;
 
     /**
      * Constructor.
@@ -41,7 +41,7 @@ public abstract class AbstractJsonValidator implements JsonValidator {
     public AbstractJsonValidator(SchemaLocation schemaLocation, JsonNodePath evaluationPath, Keyword keyword, JsonNode schemaNode) {
         this.schemaLocation = schemaLocation;
         this.evaluationPath = evaluationPath;
-        this.keyword = keyword;
+        this.keyword = keyword.getValue();
         this.schemaNode = schemaNode;
     }
 
@@ -57,7 +57,7 @@ public JsonNodePath getEvaluationPath() {
 
     @Override
     public String getKeyword() {
-        return keyword.getValue();
+        return keyword;
     }
 
     /**

src/main/java/com/networknt/schema/AdditionalPropertiesValidator.java

@@ -23,7 +23,14 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map.Entry;
+import java.util.Set;
 
 /**
  * {@link JsonValidator} for additionalProperties.
@@ -34,7 +41,7 @@ public class AdditionalPropertiesValidator extends BaseJsonValidator {
     private final boolean allowAdditionalProperties;
     private final JsonSchema additionalPropertiesSchema;
     private final Set<String> allowedProperties;
-    private final List<RegularExpression> patternProperties = new ArrayList<>();
+    private final List<RegularExpression> patternProperties;
 
     private Boolean hasUnevaluatedPropertiesValidator;
 
@@ -64,9 +71,12 @@ public AdditionalPropertiesValidator(SchemaLocation schemaLocation, JsonNodePath
 
         JsonNode patternPropertiesNode = parentSchema.getSchemaNode().get(PatternPropertiesValidator.PROPERTY);
         if (patternPropertiesNode != null) {
+            this.patternProperties = new ArrayList<>();
             for (Iterator<String> it = patternPropertiesNode.fieldNames(); it.hasNext(); ) {
                 patternProperties.add(RegularExpression.compile(it.next(), validationContext));
             }
+        } else {
+            this.patternProperties = Collections.emptyList();
         }
     }
 
@@ -93,8 +103,9 @@ public Set<ValidationMessage> validate(ExecutionContext executionContext, JsonNo
 
         Set<ValidationMessage> errors = null;
 
-        for (Iterator<String> it = node.fieldNames(); it.hasNext(); ) {
-            String pname = it.next();
+        for (Iterator<Entry<String, JsonNode>> it = node.fields(); it.hasNext(); ) {
+            Entry<String, JsonNode> entry = it.next();
+            String pname = entry.getKey();
             // skip the context items
             if (pname.startsWith("#")) {
                 continue;
@@ -120,15 +131,18 @@ public Set<ValidationMessage> validate(ExecutionContext executionContext, JsonNo
                     if (additionalPropertiesSchema != null) {
                         ValidatorState state = executionContext.getValidatorState();
                         if (state != null && state.isWalkEnabled()) {
-                            Set<ValidationMessage> results = additionalPropertiesSchema.walk(executionContext, node.get(pname), rootNode, instanceLocation.append(pname), state.isValidationEnabled());
+                            Set<ValidationMessage> results = additionalPropertiesSchema.walk(executionContext,
+                                    entry.getValue(), rootNode, instanceLocation.append(pname),
+                                    state.isValidationEnabled());
                             if (!results.isEmpty()) {
                                 if (errors == null) {
                                     errors = new LinkedHashSet<>();
                                 }
                                 errors.addAll(results);
                             }
                         } else {
-                            Set<ValidationMessage> results = additionalPropertiesSchema.validate(executionContext, node.get(pname), rootNode, instanceLocation.append(pname));
+                            Set<ValidationMessage> results = additionalPropertiesSchema.validate(executionContext,
+                                    entry.getValue(), rootNode, instanceLocation.append(pname));
                             if (!results.isEmpty()) {
                                 if (errors == null) {
                                     errors = new LinkedHashSet<>();

src/main/java/com/networknt/schema/AnnotationKeyword.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2016 Network New Technologies Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.networknt.schema;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * Used for Keywords that have no validation aspect, but are part of the metaschema, where annotations may need to be collected.
+ */
+public class AnnotationKeyword extends AbstractKeyword {
+
+    private static final class Validator extends AbstractJsonValidator {
+        public Validator(SchemaLocation schemaLocation, JsonNodePath evaluationPath, JsonNode schemaNode,
+                JsonSchema parentSchema, ValidationContext validationContext, Keyword keyword) {
+            super(schemaLocation, evaluationPath, keyword, schemaNode);
+        }
+
+        @Override
+        public Set<ValidationMessage> validate(ExecutionContext executionContext, JsonNode node, JsonNode rootNode, JsonNodePath instanceLocation) {
+            if (collectAnnotations(executionContext)) {
+                Object value = getAnnotationValue(getSchemaNode());
+                if (value != null) {
+                    putAnnotation(executionContext,
+                            annotation -> annotation.instanceLocation(instanceLocation).value(value));
+                }
+            }
+            return Collections.emptySet();
+        }
+
+        protected Object getAnnotationValue(JsonNode schemaNode) {
+            if (schemaNode.isTextual()) {
+                return schemaNode.textValue(); 
+            } else if (schemaNode.isNumber()) {
+                return schemaNode.numberValue();
+            } else if (schemaNode.isObject()) {
+                return schemaNode;
+            }
+            return null;
+        }
+    }
+
+    public AnnotationKeyword(String keyword) {
+        super(keyword);
+    }
+
+    @Override
+    public JsonValidator newValidator(SchemaLocation schemaLocation, JsonNodePath evaluationPath, JsonNode schemaNode,
+                                      JsonSchema parentSchema, ValidationContext validationContext) throws JsonSchemaException, Exception {
+        return new Validator(schemaLocation, evaluationPath, schemaNode, parentSchema, validationContext, this);
+    }
+}

src/main/java/com/networknt/schema/BaseJsonValidator.java

@@ -290,12 +290,40 @@ protected void preloadJsonSchemas(final Collection<JsonSchema> schemas) {
         }
     }
 
+    public static class JsonNodePathLegacy {
+        private static final JsonNodePath INSTANCE = new JsonNodePath(PathType.LEGACY);
+        public static JsonNodePath getInstance() {
+            return INSTANCE;
+        }
+    }
+
+    public static class JsonNodePathJsonPointer {
+        private static final JsonNodePath INSTANCE = new JsonNodePath(PathType.JSON_POINTER);
+        public static JsonNodePath getInstance() {
+            return INSTANCE;
+        }
+    }
+
+    public static class JsonNodePathJsonPath {
+        private static final JsonNodePath INSTANCE = new JsonNodePath(PathType.JSON_PATH);
+        public static JsonNodePath getInstance() {
+            return INSTANCE;
+        }
+    }
+
     /**
      * Get the root path.
      *
      * @return The path.
      */
     protected JsonNodePath atRoot() {
+        if (this.validationContext.getConfig().getPathType().equals(PathType.JSON_POINTER)) {
+            return JsonNodePathJsonPointer.getInstance();
+        } else if (this.validationContext.getConfig().getPathType().equals(PathType.LEGACY)) {
+            return JsonNodePathLegacy.getInstance();
+        } else if (this.validationContext.getConfig().getPathType().equals(PathType.JSON_PATH)) {
+            return JsonNodePathJsonPath.getInstance();
+        }
         return new JsonNodePath(this.validationContext.getConfig().getPathType());
     }
 

src/main/java/com/networknt/schema/ExecutionContext.java

@@ -26,11 +26,11 @@
  */
 public class ExecutionContext {
     private ExecutionConfig executionConfig;
-    private CollectorContext collectorContext;
+    private CollectorContext collectorContext = null;
     private ValidatorState validatorState = null;
-    private Stack<DiscriminatorContext> discriminatorContexts = new Stack<>();
-    private JsonNodeAnnotations annotations = new JsonNodeAnnotations();
-    private JsonNodeResults results = new JsonNodeResults();
+    private Stack<DiscriminatorContext> discriminatorContexts = null;
+    private JsonNodeAnnotations annotations = null;
+    private JsonNodeResults results = null;
 
     /**
      * This is used during the execution to determine if the validator should fail fast.
@@ -43,7 +43,7 @@ public class ExecutionContext {
      * Creates an execution context.
      */
     public ExecutionContext() {
-        this(new CollectorContext());
+        this(new ExecutionConfig(), null);
     }
 
     /**
@@ -61,7 +61,7 @@ public ExecutionContext(CollectorContext collectorContext) {
      * @param executionConfig the execution configuration
      */
     public ExecutionContext(ExecutionConfig executionConfig) {
-        this(executionConfig, new CollectorContext());
+        this(executionConfig, null);
     }
 
     /**
@@ -81,7 +81,10 @@ public ExecutionContext(ExecutionConfig executionConfig, CollectorContext collec
      * @return the collector context
      */
     public CollectorContext getCollectorContext() {
-        return collectorContext;
+        if (this.collectorContext == null) {
+            this.collectorContext = new CollectorContext();
+        }
+        return this.collectorContext;
     }
 
     /**
@@ -112,10 +115,16 @@ public void setExecutionConfig(ExecutionConfig executionConfig) {
     }
 
     public JsonNodeAnnotations getAnnotations() {
+        if (this.annotations == null) {
+            this.annotations = new JsonNodeAnnotations();
+        }
         return annotations;
     }
 
     public JsonNodeResults getResults() {
+        if (this.results == null) {
+            this.results = new JsonNodeResults();
+        }
         return results;
     }
 
@@ -163,13 +172,20 @@ public void setValidatorState(ValidatorState validatorState) {
     }
 
     public DiscriminatorContext getCurrentDiscriminatorContext() {
+        if (this.discriminatorContexts == null) {
+            return null;
+        }
+
         if (!this.discriminatorContexts.empty()) {
             return this.discriminatorContexts.peek();
         }
         return null; // this is the case when we get on a schema that has a discriminator, but it's not used in anyOf
     }
 
     public void enterDiscriminatorContext(final DiscriminatorContext ctx, @SuppressWarnings("unused") JsonNodePath instanceLocation) {
+        if (this.discriminatorContexts == null) {
+            this.discriminatorContexts = new Stack<>();
+        }
         this.discriminatorContexts.push(ctx);
     }
 

src/main/java/com/networknt/schema/JsonSchema.java

@@ -27,7 +27,15 @@
 import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.Set;
 import java.util.function.Consumer;
 
 /**
@@ -451,10 +459,11 @@ private List<JsonValidator> read(JsonNode schemaNode) {
         } else {
             JsonValidator refValidator = null;
 
-            Iterator<String> pnames = schemaNode.fieldNames();
-            while (pnames.hasNext()) {
-                String pname = pnames.next();
-                JsonNode nodeToUse = schemaNode.get(pname);
+            Iterator<Entry<String, JsonNode>> iterator = schemaNode.fields();
+            while (iterator.hasNext()) {
+                Entry<String, JsonNode> entry = iterator.next();
+                String pname = entry.getKey();
+                JsonNode nodeToUse = entry.getValue();
 
                 JsonNodePath path = getEvaluationPath().append(pname);
                 SchemaLocation schemaPath = getSchemaLocation().append(pname);
@@ -536,15 +545,14 @@ private long activeDialect() {
 
     @Override
     public Set<ValidationMessage> validate(ExecutionContext executionContext, JsonNode jsonNode, JsonNode rootNode, JsonNodePath instanceLocation) {
-        if (validationContext.getConfig().isOpenAPI3StyleDiscriminators()) {
+        if (this.validationContext.getConfig().isOpenAPI3StyleDiscriminators()) {
             ObjectNode discriminator = (ObjectNode) schemaNode.get("discriminator");
             if (null != discriminator && null != executionContext.getCurrentDiscriminatorContext()) {
                 executionContext.getCurrentDiscriminatorContext().registerDiscriminator(schemaLocation,
                         discriminator);
             }
         }
 
-        SchemaValidatorsConfig config = this.validationContext.getConfig();
         SetView<ValidationMessage> errors = null;
         // Set the walkEnabled and isValidationEnabled flag in internal validator state.
         setValidatorState(executionContext, false, true);
@@ -566,7 +574,7 @@ public Set<ValidationMessage> validate(ExecutionContext executionContext, JsonNo
             }
         }
 
-        if (config.isOpenAPI3StyleDiscriminators()) {
+        if (this.validationContext.getConfig().isOpenAPI3StyleDiscriminators()) {
             ObjectNode discriminator = (ObjectNode) this.schemaNode.get("discriminator");
             if (null != discriminator) {
                 final DiscriminatorContext discriminatorContext = executionContext
@@ -1137,15 +1145,13 @@ public boolean isRecursiveAnchor() {
      */
     public ExecutionContext createExecutionContext() {
         SchemaValidatorsConfig config = validationContext.getConfig();
-        CollectorContext collectorContext = new CollectorContext();
-
         // Copy execution config defaults from validation config
         ExecutionConfig executionConfig = new ExecutionConfig();
         executionConfig.setLocale(config.getLocale());
         executionConfig.setFormatAssertionsEnabled(config.getFormatAssertionsEnabled());
         executionConfig.setFailFast(config.isFailFast());
 
-        ExecutionContext executionContext = new ExecutionContext(executionConfig, collectorContext);
+        ExecutionContext executionContext = new ExecutionContext(executionConfig);
         if(config.getExecutionContextCustomizer() != null) {
             config.getExecutionContextCustomizer().customize(executionContext, validationContext);
         }