conditional mapping

org.springframework.context/src/main/java/org/springframework/mapping/support/DefaultMappingTargetFactory.java

@@ -26,6 +26,12 @@ import org.springframework.util.ClassUtils;
  */
 final class DefaultMappingTargetFactory implements MappingTargetFactory {
 
+	private static final DefaultMappingTargetFactory INSTANCE = new DefaultMappingTargetFactory();
+
+	private DefaultMappingTargetFactory() {
+
+	}
+
 	public boolean supports(TypeDescriptor targetType) {
 		return ClassUtils.hasConstructor(targetType.getType(), null);
 	}
@@ -34,4 +40,8 @@ final class DefaultMappingTargetFactory implements MappingTargetFactory {
 		return BeanUtils.instantiate(targetType.getType());
 	}
 
+	public static MappingTargetFactory getInstance() {
+		return INSTANCE;
+	}
+
 }

org.springframework.context/src/main/java/org/springframework/mapping/support/FieldToFieldMapping.java

@@ -31,10 +31,13 @@ final class FieldToFieldMapping implements SpelMapping {
 	@SuppressWarnings("unchecked")
 	private final Converter converter;
 
-	public FieldToFieldMapping(Expression sourceField, Expression targetField, Converter<?, ?> converter) {
+	private final Expression condition;
+	
+	public FieldToFieldMapping(Expression sourceField, Expression targetField, Converter<?, ?> converter, Expression condition) {
 		this.sourceField = sourceField;
 		this.targetField = targetField;
 		this.converter = converter;
+		this.condition = condition;
 	}
 
 	public String getSourceField() {
@@ -51,6 +54,9 @@ final class FieldToFieldMapping implements SpelMapping {
 	
 	@SuppressWarnings("unchecked")
 	public void map(SpelMappingContext context) {
+		if (!context.conditionHolds(this.condition)) {
+			return;
+		}
 		try {
 			Object value = context.getSourceFieldValue(this.sourceField);
 			if (this.converter != null) {

org.springframework.context/src/main/java/org/springframework/mapping/support/FieldToMultiFieldMapping.java

@@ -28,10 +28,13 @@ final class FieldToMultiFieldMapping implements SpelMapping {
 
 	@SuppressWarnings("unchecked")
 	private final Mapper targetFieldMapper;
-	
-	public FieldToMultiFieldMapping(Expression sourceField, Mapper<?, ?> targetFieldMapper) {
+
+	private final Expression condition;
+
+	public FieldToMultiFieldMapping(Expression sourceField, Mapper<?, ?> targetFieldMapper, Expression condition) {
 		this.sourceField = sourceField;
 		this.targetFieldMapper = targetFieldMapper;
+		this.condition = condition;
 	}
 
 	public String getSourceField() {
@@ -44,6 +47,9 @@ final class FieldToMultiFieldMapping implements SpelMapping {
 
 	@SuppressWarnings("unchecked")
 	public void map(SpelMappingContext context) {
+		if (!context.conditionHolds(this.condition)) {
+			return;
+		}		
 		try {
 			Object value = context.getSourceFieldValue(this.sourceField);
 			this.targetFieldMapper.map(value, context.getTarget());

org.springframework.context/src/main/java/org/springframework/mapping/support/MapperBuilder.java

@@ -50,7 +50,7 @@ public interface MapperBuilder<S, T> {
 	 * The source and target field names will be the same value.
 	 * For example, calling <code>addMapping("order")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>order</code> field on the target.
 	 * This is a convenience method for calling {@link #addMapping(String, String)} with the same source and target value..
-	 * @param fieldExpression the field mapping expression
+	 * @param field the field mapping expression
 	 * @return this, for configuring additional field mapping options fluently
 	 */
 	MapperBuilder<S, T> addMapping(String field);
@@ -60,7 +60,7 @@ public interface MapperBuilder<S, T> {
 	 * The source and target field expressions will be the same value.
 	 * For example, calling <code>addMapping("order")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>order</code> field on the target.
 	 * This is a convenience method for calling {@link #addMapping(String, String, Converter)} with the same source and target value..
-	 * @param fieldExpression the field mapping expression
+	 * @param field the field mapping expression
 	 * @param converter the converter that will convert the source field value before mapping the value to the target field
 	 * @return this, for configuring additional field mapping options fluently
 	 */
@@ -81,8 +81,8 @@ public interface MapperBuilder<S, T> {
 	 * Register a mapping between a source field and a target field.
 	 * Use this method when the name of the source field and the name of the target field are different.
 	 * For example, calling <code>addMapping("order", "primaryOrder")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>primaryOrder</code> field on the target.
-	 * @param sourceFieldExpression the source field mapping expression
-	 * @param targetFieldExpression the target field mapping expression 
+	 * @param sourceField the source field mapping expression
+	 * @param targetField the target field mapping expression 
 	 * @return this, for configuring additional field mapping options fluently
 	 */
 	MapperBuilder<S, T> addMapping(String sourceField, String targetField);
@@ -91,8 +91,8 @@ public interface MapperBuilder<S, T> {
 	 * Register a mapping between a source field and a target field that first converts the source field value using the provided Converter.
 	 * Use this method when the name of the source field and the name of the target field are different.
 	 * For example, calling <code>addMapping("order", "primaryOrder")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>primaryOrder</code> field on the target.
-	 * @param sourceFieldExpression the source field mapping expression
-	 * @param targetFieldExpression the target field mapping expression 
+	 * @param sourceField the source field mapping expression
+	 * @param targetField the target field mapping expression 
 	 * @return this, for configuring additional field mapping options fluently
 	 */
 	MapperBuilder<S, T> addMapping(String sourceField, String targetField, Converter<?, ?> converter);
@@ -107,6 +107,71 @@ public interface MapperBuilder<S, T> {
 	 */
 	MapperBuilder<S, T> addMapping(String[] fields, Mapper<S, T> mapper);
 
+	/**
+	 * Register a conditional mapping between a source field and a target field.
+	 * The source and target field names will be the same value.
+	 * @param field the field mapping expression
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addConditionalMapping(String field, String condition);
+
+	/**
+	 * Register a condition mapping between a source field and a target field that first converts the source field value using the provided Converter.
+	 * The source and target field expressions will be the same value.
+	 * @param field the field mapping expression
+	 * @param converter the converter that converts the source field value before mapping
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addConditionalMapping(String field, Converter<?, ?> converter, String condition);
+
+	/**
+	 * Register a conditional mapping between a source field and multiple target fields.
+	 * Use this method when you need to map a single source field value to multiple fields on the target.
+	 * For example, calling <code>addMapping("name", firstAndLastNameMapper)</code> might register a mapping that maps the <code>name</code> field on the source to the <code>firstName</code> and <code>lastName</code> fields on the target.
+	 * The target field {@link Mapper} will be passed the value of the source field for its source and the target object T for its target.
+	 * @param field the source field expression
+	 * @param mapper the mapper of the target fields
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addConditionalMapping(String field, Mapper<?, T> mapper, String condition);
+
+	/**
+	 * Register a conditional mapping between a source field and a target field.
+	 * Use this method when the name of the source field and the name of the target field are different.
+	 * For example, calling <code>addMapping("order", "primaryOrder")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>primaryOrder</code> field on the target.
+	 * @param sourceField the source field mapping expression
+	 * @param targetField the target field mapping expression 
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addConditionalMapping(String sourceField, String targetField, String condition);
+
+	/**
+	 * Register a conditional mapping between a source field and a target field that first converts the source field value using the provided Converter.
+	 * Use this method when the name of the source field and the name of the target field are different.
+	 * For example, calling <code>addMapping("order", "primaryOrder")</code> will register a mapping that maps between the <code>order</code> field on the source and the <code>primaryOrder</code> field on the target.
+	 * @param sourceField the source field mapping expression
+	 * @param targetField the target field mapping expression
+	 * @param converter the converter that converts the source field value before mapping
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addConditionalMapping(String sourceField, String targetField, Converter<?, ?> converter, String condition);
+
+	/**
+	 * Register a conditional mapping between multiple source fields and a single target field.
+	 * For example, calling <code>addMapping(dateAndTimeFieldsToDateTimeFieldMapper)</code> might register a mapping that maps the <code>date</code> and <code>time</code> fields on the source to the <code>dateTime</code> field on the target.
+	 * The provided {@link Mapper} will be passed the source object S for its source and the target object T for its target.
+	 * @param fields the source field mapping expressions
+	 * @param mapper the fields to field mapper
+	 * @param condition the boolean expression that determines if this mapping executes
+	 * @return this, for configuring additional field mapping options fluently
+	 */
+	MapperBuilder<S, T> addMapping(String[] fields, Mapper<S, T> mapper, String condition);
+	
 	/**
 	 * Register a Mapper that will be used to map between nested source and target fields of a specific sourceType/targetType pair.
 	 * The source and target field types are determined by introspecting the parameterized types on the Mapper generic interface.
@@ -130,11 +195,18 @@ public interface MapperBuilder<S, T> {
 	 * Register a custom type converter to use to convert between two mapped types.
 	 * The Converter may convert between simple types, such as Strings to Dates.
 	 * Alternatively, it may convert between complex types and initiate a recursive mapping operation between two object fields.
+	 * @return this, for configuring additional field mapping options fluently
 	 * @see Converter
 	 * @see MappingConverter
 	 */
 	MapperBuilder<S, T> addConverter(Converter<?, ?> converter);
 
+	/**
+	 * Set the source fields to exclude from mapping.
+	 * @param fields the source fields as var args
+	 */
+	MapperBuilder<S, T>  setExcludedFields(String... fields);
+
 	/**
 	 * Get the Mapper produced by this builder.
 	 * Call this method after instructing the builder.

org.springframework.context/src/main/java/org/springframework/mapping/support/MappingConversionService.java

@@ -23,7 +23,7 @@ final class MappingConversionService extends DefaultConversionService {
 
 	@Override
 	protected GenericConverter getDefaultConverter(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return new MappingConverter(new SpelMapper());
+		return new MappingConverter(new SpelMapper(), null);
 	}
 
 }

org.springframework.context/src/main/java/org/springframework/mapping/support/MappingConverter.java

@@ -33,15 +33,6 @@ final class MappingConverter implements GenericConverter {
 
 	private final MappingTargetFactory mappingTargetFactory;
 
-	/**
-	 * Creates a new Converter that delegates to the mapper to complete the type conversion process.
-	 * Uses a {@link DefaultMappingTargetFactory} to create the target object to map and return.
-	 * @param mapper the mapper
-	 */
-	public MappingConverter(Mapper mapper) {
-		this(mapper, new DefaultMappingTargetFactory());
-	}
-
 	/**
 	 * Creates a new Converter that delegates to the mapper to complete the type conversion process.
 	 * Uses the specified MappingTargetFactory to create the target object to map and return.
@@ -49,7 +40,11 @@ final class MappingConverter implements GenericConverter {
 	 */
 	public MappingConverter(Mapper mapper, MappingTargetFactory mappingTargetFactory) {
 		this.mapper = mapper;
-		this.mappingTargetFactory = mappingTargetFactory;
+		if (mappingTargetFactory != null) {
+			this.mappingTargetFactory = mappingTargetFactory;
+		} else {
+			this.mappingTargetFactory = DefaultMappingTargetFactory.getInstance();
+		}
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {

org.springframework.context/src/main/java/org/springframework/mapping/support/MultiFieldToFieldMapping.java

@@ -16,6 +16,7 @@
 package org.springframework.mapping.support;
 
 import org.springframework.core.style.StylerUtils;
+import org.springframework.expression.Expression;
 import org.springframework.mapping.Mapper;
 
 /**
@@ -29,9 +30,12 @@ final class MultiFieldToFieldMapping implements SpelMapping {
 	@SuppressWarnings("unchecked")
 	private final Mapper multiFieldMapper;
 
-	public MultiFieldToFieldMapping(String[] fields, Mapper<?, ?> multiFieldMapper) {
+	private Expression condition;
+	
+	public MultiFieldToFieldMapping(String[] fields, Mapper<?, ?> multiFieldMapper, Expression condition) {
 		this.fields = fields;
 		this.multiFieldMapper = multiFieldMapper;
+		this.condition = condition;
 	}
 
 	public String[] getSourceFields() {
@@ -49,6 +53,9 @@ final class MultiFieldToFieldMapping implements SpelMapping {
 
 	@SuppressWarnings("unchecked")
 	public void map(SpelMappingContext context) {
+		if (!context.conditionHolds(this.condition)) {
+			return;
+		}		
 		try {
 			this.multiFieldMapper.map(context.getSource(), context.getTarget());
 		} catch (Exception e) {

org.springframework.context/src/main/java/org/springframework/mapping/support/SpelMapper.java

@@ -71,64 +71,32 @@ final class SpelMapper implements Mapper<Object, Object> {
 		this.mappableTypeFactory = mappableTypeFactory;
 	}
 
-	public void addMapping(String sourceFieldExpression, String targetFieldExpression, Converter<?, ?> converter) {
+	public void setExcludedFields(String[] fields) {
+		// TODO
+	}
+	
+	public void addMapping(String sourceFieldExpression, String targetFieldExpression, Converter<?, ?> converter,
+			String condition) {
 		Expression sourceField = parseSourceField(sourceFieldExpression);
 		Expression targetField = parseTargetField(targetFieldExpression);
-		FieldToFieldMapping mapping = new FieldToFieldMapping(sourceField, targetField, converter);
+		FieldToFieldMapping mapping = new FieldToFieldMapping(sourceField, targetField, converter,
+				parseCondition(condition));
 		this.mappings.add(mapping);
 	}
 
-	public void addMapping(String field, Mapper<?, ?> mapper) {
-		this.mappings.add(new FieldToMultiFieldMapping(parseSourceField(field), mapper));
+	public void addMapping(String field, Mapper<?, ?> mapper, String condition) {
+		this.mappings.add(new FieldToMultiFieldMapping(parseSourceField(field), mapper, parseCondition(condition)));
 	}
 
-	public void addMapping(String[] fields, Mapper<?, ?> mapper) {
-		this.mappings.add(new MultiFieldToFieldMapping(fields, mapper));
+	public void addMapping(String[] fields, Mapper<?, ?> mapper, String condition) {
+		this.mappings.add(new MultiFieldToFieldMapping(fields, mapper, parseCondition(condition)));
 	}
 
-	/**
-	 * Adds a Mapper that will map the fields of a nested sourceType/targetType pair.
-	 * The source and target field types are determined by introspecting the parameterized types on the implementation's Mapper generic interface.
-	 * The target instance that is mapped is constructed by a {@link DefaultMappingTargetFactory}.
-	 * This method is a convenience method for {@link #addNestedMapper(Class, Class, Mapper)}.
-	 * @param nestedMapper the nested mapper
-	 */
-	public void addNestedMapper(Mapper<?, ?> nestedMapper) {
-		Class<?>[] typeInfo = getRequiredTypeInfo(nestedMapper);
-		addNestedMapper(typeInfo[0], typeInfo[1], nestedMapper);
-	}
-
-	/**
-	 * Adds a Mapper that will map the fields of a nested sourceType/targetType pair.
-	 * The source and target field types are determined by introspecting the parameterized types on the implementation's Mapper generic interface.
-	 * The target instance that is mapped is constructed by the provided {@link MappingTargetFactory}.
-	 * This method is a convenience method for {@link #addNestedMapper(Class, Class, Mapper, MappingTargetFactory)}.
-	 * @param nestedMapper the nested mapper
-	 * @param targetFactory the nested mapper's target factory
-	 */
 	public void addNestedMapper(Mapper<?, ?> nestedMapper, MappingTargetFactory targetFactory) {
 		Class<?>[] typeInfo = getRequiredTypeInfo(nestedMapper);
 		addNestedMapper(typeInfo[0], typeInfo[1], nestedMapper, targetFactory);
 	}
 
-	/**
-	 * Adds a Mapper that will map the fields of a nested sourceType/targetType pair.
-	 * The target instance that is mapped is constructed by a {@link DefaultMappingTargetFactory}.
-	 * @param sourceType the source nested object property type
-	 * @param targetType the target nested object property type
-	 * @param nestedMapper the nested mapper
-	 */
-	public void addNestedMapper(Class<?> sourceType, Class<?> targetType, Mapper<?, ?> nestedMapper) {
-		this.conversionService.addGenericConverter(sourceType, targetType, new MappingConverter(nestedMapper));
-	}
-
-	/**
-	 * Adds a Mapper that will map the fields of a nested sourceType/targetType pair.
-	 * @param sourceType the source nested object property type
-	 * @param targetType the target nested object property type
-	 * @param nestedMapper the nested mapper
-	 * @param targetFactory the nested mapper's target factory
-	 */
 	public void addNestedMapper(Class<?> sourceType, Class<?> targetType, Mapper<?, ?> nestedMapper,
 			MappingTargetFactory targetFactory) {
 		this.conversionService.addGenericConverter(sourceType, targetType, new MappingConverter(nestedMapper,
@@ -170,25 +138,33 @@ final class SpelMapper implements Mapper<Object, Object> {
 	// internal helpers
 
 	private Expression parseSourceField(String sourceFieldExpression) {
-		Expression sourceExp;
 		try {
-			sourceExp = sourceExpressionParser.parseExpression(sourceFieldExpression);
+			return sourceExpressionParser.parseExpression(sourceFieldExpression);
 		} catch (ParseException e) {
 			throw new IllegalArgumentException("The mapping source '" + sourceFieldExpression
 					+ "' is not a parseable value expression", e);
 		}
-		return sourceExp;
+	}
+
+	private Expression parseCondition(String condition) {
+		if (condition == null) {
+			return null;
+		}
+		try {
+			return sourceExpressionParser.parseExpression(condition);
+		} catch (ParseException e) {
+			throw new IllegalArgumentException("The mapping condition '" + condition
+					+ "' is not a parseable value expression", e);
+		}
 	}
 
 	private Expression parseTargetField(String targetFieldExpression) {
-		Expression targetExp;
 		try {
-			targetExp = targetExpressionParser.parseExpression(targetFieldExpression);
+			return targetExpressionParser.parseExpression(targetFieldExpression);
 		} catch (ParseException e) {
 			throw new IllegalArgumentException("The mapping target '" + targetFieldExpression
 					+ "' is not a parseable property expression", e);
 		}
-		return targetExp;
 	}
 
 	private Class<?>[] getRequiredTypeInfo(Mapper<?, ?> mapper) {
@@ -221,7 +197,7 @@ final class SpelMapper implements Mapper<Object, Object> {
 					}
 					try {
 						if (targetExpression.isWritable(targetContext)) {
-							autoMappings.add(new FieldToFieldMapping(sourceExpression, targetExpression, null));
+							autoMappings.add(new FieldToFieldMapping(sourceExpression, targetExpression, null, null));
 						}
 					} catch (EvaluationException e) {
 
@@ -246,4 +222,5 @@ final class SpelMapper implements Mapper<Object, Object> {
 		}
 		return false;
 	}
+
 }

org.springframework.context/src/main/java/org/springframework/mapping/support/SpelMapperBuilder.java

@@ -40,37 +40,68 @@ final class SpelMapperBuilder<S, T> implements MapperBuilder<S, T> {
 	}
 
 	public MapperBuilder<S, T> addMapping(String field) {
-		this.mapper.addMapping(field, field, null);
+		this.mapper.addMapping(field, field, null, null);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addMapping(String field, Converter<?, ?> converter) {
-		this.mapper.addMapping(field, field, converter);
+		this.mapper.addMapping(field, field, converter, null);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addMapping(String field, Mapper<?, T> mapper) {
-		this.mapper.addMapping(field, mapper);
+		this.mapper.addMapping(field, mapper, null);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addMapping(String sourceField, String targetField) {
-		this.mapper.addMapping(sourceField, targetField, null);
+		this.mapper.addMapping(sourceField, targetField, null, null);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addMapping(String sourceField, String targetField, Converter<?, ?> converter) {
-		this.mapper.addMapping(sourceField, targetField, converter);
+		this.mapper.addMapping(sourceField, targetField, converter, null);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addMapping(String[] fields, Mapper<S, T> mapper) {
-		this.mapper.addMapping(fields, mapper);
+		this.mapper.addMapping(fields, mapper, null);
+		return this;
+	}
+
+	public MapperBuilder<S, T> addConditionalMapping(String field, String condition) {
+		this.mapper.addMapping(field, field, null, condition);
+		return this;
+	}
+	
+	public MapperBuilder<S, T> addConditionalMapping(String field, Converter<?, ?> converter, String condition) {
+		this.mapper.addMapping(field, field, converter, condition);
+		return this;
+	}
+
+	public MapperBuilder<S, T> addConditionalMapping(String field, Mapper<?, T> mapper, String condition) {
+		this.mapper.addMapping(field, mapper, condition);
+		return this;
+	}
+
+	public MapperBuilder<S, T> addConditionalMapping(String sourceField, String targetField, String condition) {
+		this.mapper.addMapping(sourceField, targetField, null, condition);
+		return this;
+	}
+
+	public MapperBuilder<S, T> addConditionalMapping(String sourceField, String targetField, Converter<?, ?> converter,
+			String condition) {
+		this.mapper.addMapping(sourceField, targetField, converter, condition);
+		return this;
+	}
+
+	public MapperBuilder<S, T> addMapping(String[] fields, Mapper<S, T> mapper, String condition) {
+		this.mapper.addMapping(fields, mapper, condition);
 		return this;
 	}
 
 	public MapperBuilder<S, T> addNestedMapper(Mapper<?, ?> nestedMapper) {
-		this.mapper.addNestedMapper(nestedMapper);
+		this.mapper.addNestedMapper(nestedMapper, null);
 		return this;
 	}
 
@@ -83,6 +114,11 @@ final class SpelMapperBuilder<S, T> implements MapperBuilder<S, T> {
 		this.mapper.getConverterRegistry().addConverter(converter);
 		return this;
 	}
+	
+	public MapperBuilder<S, T> setExcludedFields(String... fields) {
+		this.mapper.setExcludedFields(fields);
+		return this;
+	}
 
 	@SuppressWarnings("unchecked")
 	public Mapper<S, T> getMapper() {

org.springframework.context/src/main/java/org/springframework/mapping/support/SpelMappingContext.java

@@ -43,7 +43,14 @@ final class SpelMappingContext {
 	public Object getTarget() {
 		return this.targetEvaluationContext.getRootObject().getValue();
 	}
-	
+
+	public boolean conditionHolds(Expression condition) {
+		if (condition == null) {
+			return true;
+		}
+		return Boolean.TRUE.equals(condition.getValue(this.sourceEvaluationContext));
+	}
+
 	public Object getSourceFieldValue(Expression sourceField) {
 		return sourceField.getValue(this.sourceEvaluationContext);
 	}
@@ -61,4 +68,5 @@ final class SpelMappingContext {
 			throw new MappingException(this.failures);
 		}
 	}
+
 }

org.springframework.context/src/test/java/org/springframework/mapping/support/MappingTests.java

@@ -317,6 +317,45 @@ public class MappingTests {
 				.getActivationDateTime());
 	}
 
+	@Test
+	public void conditionalMapping() {
+		Map<String, String> domestic = new HashMap<String, String>();
+		domestic.put("international", "false");
+		domestic.put("areaCode", "205");
+		domestic.put("prefix", "339");
+		domestic.put("line", "1234");
+		domestic.put("countryCode", "whatever");
+		domestic.put("cityCode", "whatever");
+
+		Mapper<Map, PhoneNumber> mapper = MapperFactory.mapperBuilder(Map.class, PhoneNumber.class)
+			.addConditionalMapping("countryCode", "international == 'true'")
+			.addConditionalMapping("cityCode", "international == 'true'")
+			.getMapper();
+		
+		PhoneNumber number = mapper.map(domestic, new PhoneNumber());
+		assertEquals("205", number.getAreaCode());
+		assertEquals("339", number.getPrefix());
+		assertEquals("1234", number.getLine());
+		assertNull(number.getCountryCode());
+		assertNull(number.getCityCode());
+		
+		Map<String, String> international = new HashMap<String, String>();
+		international.put("international", "true");
+		international.put("areaCode", "205");
+		international.put("prefix", "339");
+		international.put("line", "1234");
+		international.put("countryCode", "1");
+		international.put("cityCode", "2");
+		
+		PhoneNumber number2 = mapper.map(international, new PhoneNumber());
+
+		assertEquals("205", number2.getAreaCode());
+		assertEquals("339", number2.getPrefix());
+		assertEquals("1234", number2.getLine());
+		assertEquals("1", number2.getCountryCode());
+		assertEquals("2", number2.getCityCode());
+	}
+
 	@Test
 	public void mapList() {
 		PersonDto source = new PersonDto();
@@ -876,4 +915,59 @@ public class MappingTests {
 		}
 
 	}
+
+	public static class PhoneNumber {
+
+		private String areaCode;
+
+		private String prefix;
+
+		private String line;
+
+		private String countryCode;
+
+		private String cityCode;
+
+		public String getAreaCode() {
+			return areaCode;
+		}
+
+		public void setAreaCode(String areaCode) {
+			this.areaCode = areaCode;
+		}
+
+		public String getPrefix() {
+			return prefix;
+		}
+
+		public void setPrefix(String prefix) {
+			this.prefix = prefix;
+		}
+
+		public String getLine() {
+			return line;
+		}
+
+		public void setLine(String line) {
+			this.line = line;
+		}
+
+		public String getCountryCode() {
+			return countryCode;
+		}
+
+		public void setCountryCode(String countryCode) {
+			this.countryCode = countryCode;
+		}
+
+		public String getCityCode() {
+			return cityCode;
+		}
+
+		public void setCityCode(String cityCode) {
+			this.cityCode = cityCode;
+		}
+
+	}
+
 }