Units_Generator - add constant validator

fixes #66

units_generator/src/main/java/units_generator/schema_validator/ConstantValidator.java

@@ -0,0 +1,55 @@
+package units_generator.schema_validator;
+
+import units_generator.schema_validator.exceptions.InvalidConstantDefinition;
+import units_generator.schema_validator.exceptions.InvalidSchema;
+import units_schema.Constant;
+import units_schema.ConstantsGroup;
+import units_schema.Schema;
+
+public class ConstantValidator {
+
+	public static void validate(
+			Schema schema,
+			ConstantsGroup group,
+			Constant constant) throws InvalidSchema {
+		validateName(group, constant);
+		validateScaleDefinition(schema, group, constant);
+	}
+
+	private static void validateScaleDefinition(Schema schema, ConstantsGroup group, Constant constant)
+			throws InvalidConstantDefinition, InvalidSchema {
+		String context = getContext(group, constant);
+		boolean isSimpleScale = constant.getUnitScale() != null;
+		boolean isRatioScale = constant.getRatio() != null;
+		if (isSimpleScale && isRatioScale)
+			throw new InvalidConstantDefinition(context);
+		if (isSimpleScale)
+			UnitsExistanceValidator.validateUnitScaleExistanceCount(
+					schema,
+					constant.getUnitScale(),
+					context);
+		if (isRatioScale)
+			RatioValidator.validateUnitScalesRatio(
+					schema,
+					constant.getRatio(),
+					context);
+	}
+
+	private static void validateName(ConstantsGroup group, Constant constant) throws InvalidSchema {
+		String context = getAnonymousContext(group, constant);
+		NamesValidator.validateName(constant.getName(), context);
+	}
+
+	public static String getAnonymousContext(
+			ConstantsGroup group,
+			Constant constant) {
+		int index = group.getConstants().indexOf(constant) + 1;
+		return "in constant number " + index +
+				" of \"" + group.getGroupName() + "\" constants group";
+	}
+
+	private static String getContext(ConstantsGroup group, Constant constant) {
+		String context = "in \"" + constant.getName() + "\" of the \"" + group.getGroupName() + "\" constants group";
+		return context;
+	}
+}

units_generator/src/main/java/units_generator/schema_validator/ConstantsGroupValidator.java

@@ -1,6 +1,7 @@
 package units_generator.schema_validator;
 
 import units_generator.schema_validator.exceptions.InvalidSchema;
+import units_schema.Constant;
 import units_schema.ConstantsGroup;
 import units_schema.Schema;
 
@@ -13,10 +14,13 @@ public static void validate(Schema schema, ConstantsGroup group) throws InvalidS
 	private static void validateName(Schema schema, ConstantsGroup group) throws InvalidSchema {
 		String context = getAnonymousContext(schema, group);
 		NamesValidator.validateName(group.getGroupName(), context);
+		for (Constant constant : group.getConstants()) {
+			ConstantValidator.validate(schema, group, constant);
+		}
 	}
 
 	public static String getAnonymousContext(Schema schema, ConstantsGroup group) {
-		int index = schema.getConstants().getConstantsGroups().indexOf(group);
+		int index = schema.getConstants().getConstantsGroups().indexOf(group) + 1;
 		return "in context group number " + index;
 	}
 }

units_generator/src/main/java/units_generator/schema_validator/exceptions/InvalidConstantDefinition.java

@@ -0,0 +1,13 @@
+package units_generator.schema_validator.exceptions;
+
+public class InvalidConstantDefinition extends InvalidSchema {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 7200036100795696471L;
+
+	public InvalidConstantDefinition(String context) {
+		super("constant can't have both \"unit scale\" and \"ratio\" attributes", context);
+	}
+}

units_generator/src/main/java/units_generator/schema_validator/exceptions/InvalidName.java

@@ -9,6 +9,7 @@ public class InvalidName extends InvalidSchema {
 
 	public InvalidName(String name, String context) {
 		super("\"" + name + "\" name is invalid. name must contain only" +
-				" lowercase letters and no trailing spaces", context);
+				" lowercase letters and numbers, start with a letter and" +
+				" have no trailing spaces", context);
 	}
 }

units_generator/src/main/java/units_generator/schema_validator/exceptions/InvalidUnitScaleCount.java

@@ -8,7 +8,7 @@ public class InvalidUnitScaleCount extends InvalidSchema {
 	private static final long serialVersionUID = -4158463001679678815L;
 
 	public InvalidUnitScaleCount(String unitScaleName, long count, String context) {
-		super("\"" + unitScaleName + "\" unit type found " + count
-				+ " times in schema, but there should be only one", context);
+		super("\"" + unitScaleName + "\" unit scale found " + count
+				+ " times in schema, but there should be exactly one", context);
 	}
 }

units_generator/src/main/java/units_generator/schema_validator/exceptions/InvalidUnitTypeCount.java

@@ -9,6 +9,6 @@ public class InvalidUnitTypeCount extends InvalidSchema {
 
 	public InvalidUnitTypeCount(String unitTypeName, long count, String context) {
 		super("\"" + unitTypeName + "\" unit type found " + count
-				+ " times in schema, but there should be only one", context);
+				+ " times in schema, but there should be exactly one", context);
 	}
 }