fixes issue #151

Author: GavinChenYan

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

@@ -28,6 +28,7 @@ public class FormatKeyword implements Keyword {
 
     private final String DATE = "date";
     private final String DATE_TIME = "date-time";
+    private final String UUID = "uuid";
 
     public FormatKeyword(ValidatorTypeCode type, Map<String, Format> formats) {
         this.type = type;
@@ -48,6 +49,8 @@ public JsonValidator newValidator(String schemaPath, JsonNode schemaNode, JsonSc
             // Validate date and time separately
             if (formatName.equals(DATE) || formatName.equals(DATE_TIME)) {
                 return new DateTimeValidator(schemaPath, schemaNode, parentSchema, validationContext, formatName);
+            } else if (formatName.equals(UUID)) {
+                return new UUIDValidator(schemaPath, schemaNode, parentSchema, validationContext, formatName);
             }
         }
         return new FormatValidator(schemaPath, schemaNode, parentSchema, validationContext, format);

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

@@ -0,0 +1,63 @@
+/*
+ * 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 org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.text.ParsePosition;
+import java.text.SimpleDateFormat;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class UUIDValidator extends BaseJsonValidator implements JsonValidator {
+    private static final Logger logger = LoggerFactory.getLogger(UUIDValidator.class);
+
+    private final String formatName;
+
+
+    private static final String regex = "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$";
+
+    public UUIDValidator(String schemaPath, JsonNode schemaNode, JsonSchema parentSchema, ValidationContext validationContext, String formatName) {
+        super(schemaPath, schemaNode, parentSchema, ValidatorTypeCode.DATETIME, validationContext);
+        this.formatName = formatName;
+        parseErrorCode(getValidatorType().getErrorCodeKey());
+    }
+
+    public Set<ValidationMessage> validate(JsonNode node, JsonNode rootNode, String at) {
+        debug(logger, node, rootNode, at);
+
+        Set<ValidationMessage> errors = new LinkedHashSet<ValidationMessage>();
+
+        JsonType nodeType = TypeFactory.getValueNodeType(node);
+        if (nodeType != JsonType.STRING) {
+            return errors;
+        }
+        if (!isUUID(node.textValue())) {
+            errors.add(buildValidationMessage(at, node.textValue(), formatName));
+        }
+        return Collections.unmodifiableSet(errors);
+    }
+
+    public boolean isUUID(String s){
+        return s.matches(regex);
+    }
+}

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

@@ -63,7 +63,8 @@ public JsonValidator newValidator(String schemaPath, JsonNode schemaNode, JsonSc
     TYPE("type", "1029", new MessageFormat("{0}: {1} found, {2} expected")),
     UNION_TYPE("unionType", "1030", new MessageFormat("{0}: {1} found, but {2} is required")),
     UNIQUE_ITEMS("uniqueItems", "1031", new MessageFormat("{0}: the items in the array must be unique")),
-    DATETIME("date-time", "1034", new MessageFormat("{0}: {1} is an invalid {2}"));
+    DATETIME("date-time", "1034", new MessageFormat("{0}: {1} is an invalid {2}")),
+    UUID("uuid", "1035", new MessageFormat("{0}: {1} is an invalid {2}"));
 
 	private static Map<String, ValidatorTypeCode> constants = new HashMap<String, ValidatorTypeCode>();