Add CasserValidator for property values

src/main/java/com/noorq/casser/core/CasserValidator.java

@@ -0,0 +1,55 @@
+/*
+ *      Copyright (C) 2015 Noorq, 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.noorq.casser.core;
+
+import java.lang.annotation.Annotation;
+
+import javax.validation.ConstraintValidator;
+
+import com.noorq.casser.mapping.CasserProperty;
+import com.noorq.casser.support.CasserException;
+import com.noorq.casser.support.CasserMappingException;
+
+public final class CasserValidator {
+
+	private CasserValidator() {
+		
+	}
+	
+	public static void validate(CasserProperty prop, Object value) {
+		
+		for (ConstraintValidator<? extends Annotation, ?> validator : prop.getValidators()) {
+			
+			ConstraintValidator typeless = (ConstraintValidator) validator;
+			
+			
+			boolean valid = false;
+			
+			try {
+				valid = typeless.isValid(value, null);
+			}
+			catch(ClassCastException e) {
+				throw new CasserMappingException("validator was used for wrong type '" + value + "' in " + prop, e);
+			}
+			
+			if (!valid) {
+				throw new CasserException("wrong value type '" + value + "' for " + prop);
+			}
+		}
+		
+	}
+	
+}

src/test/java/com/noorq/casser/test/integration/core/CasserValidatorTest.java

@@ -0,0 +1,54 @@
+package com.noorq.casser.test.integration.core;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import com.noorq.casser.core.Casser;
+import com.noorq.casser.core.CasserValidator;
+import com.noorq.casser.mapping.CasserEntity;
+import com.noorq.casser.mapping.CasserProperty;
+import com.noorq.casser.mapping.annotation.Constraints;
+import com.noorq.casser.mapping.annotation.PartitionKey;
+import com.noorq.casser.mapping.annotation.Table;
+import com.noorq.casser.support.CasserException;
+import com.noorq.casser.support.CasserMappingException;
+
+public class CasserValidatorTest {
+
+	@Table
+	interface ModelForValidation {
+		
+		@Constraints.Email
+		@PartitionKey
+		String id();
+		
+	}
+	
+	CasserEntity entity;
+	
+	CasserProperty prop;
+	
+	@Before
+	public void begin() {
+		
+		entity = Casser.entity(ModelForValidation.class);
+		
+		prop = entity.getProperty("id");
+		
+	}
+	
+	@Test(expected=CasserMappingException.class)
+	public void testWrongType() {
+		CasserValidator.validate(prop, Integer.valueOf(123));
+	}
+
+	@Test(expected=CasserException.class)
+	public void testWrongValue() {
+		CasserValidator.validate(prop, "123");
+	}
+
+
+	public void testOk() {
+		CasserValidator.validate(prop, "a@b.c");
+	}
+}