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Complete Phase 4: JavaPoet migration for all remaining generators
This completes the migration from string concatenation to JavaPoet for all remaining code generators: ## MapperGenerator - Converted to extend AbstractJavaPoetGenerator - Uses TypeSpec.Builder for type-safe class generation - Generates FieldSpec objects for dependency injection fields - Creates MethodSpec objects for all mapping and convenience methods - Automatic import management via JavaPoet - Clean separation of concerns with helper methods ## ConvenienceMethodGenerator - Converted from PrintWriter output to List<MethodSpec> return - Type-safe method generation for all convenience methods - Proper parameter type handling with ParameterizedTypeName - Maintained backward compatibility with deprecated PrintWriter method ## DependencyInjectionGenerator - Split into separate methods for fields and constructor generation - Returns FieldSpec and MethodSpec objects instead of writing directly - Type-safe dependency handling with ClassName.bestGuess() - Backward compatible deprecated method for existing usage ## TableNameResolverGenerator - Complete rewrite using JavaPoet builders - Extends AbstractJavaPoetGenerator for consistency - Clean switch expression generation with proper escaping - Type-safe method signatures and return types ## Benefits Achieved: - Type safety: All code generation uses JavaPoet's type-safe builders - Import management: Automatic handling eliminates ImportResolver - Code quality: Generated code is properly formatted and consistent - Maintainability: Much cleaner and more readable generation logic - Error reduction: Compile-time checking prevents many runtime issues ## Verification: - All tests pass (main: 10/10, integration: 4/4) - Generated code compiles and runs correctly - Clean, properly formatted output with correct imports - CDI dependency injection works correctly - All mapping strategies function as expected Phase 4 successfully completes the core JavaPoet migration while preserving all existing functionality.
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‎src/main/java/com/github/wassertim/dynamodb/toolkit/generation/ConvenienceMethodGenerator.java‎

Lines changed: 121 additions & 81 deletions
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package com.github.wassertim.dynamodb.toolkit.generation;
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import java.io.PrintWriter;
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import com.palantir.javapoet.*;
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import com.github.wassertim.dynamodb.toolkit.analysis.TypeInfo;
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import software.amazon.awssdk.services.dynamodb.model.AttributeValue;
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import java.util.*;
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import java.util.stream.Collectors;
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import javax.lang.model.element.Modifier;
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/**
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* JavaPoet-based convenience methods generator for mapper classes.
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* Generates convenience methods for mapper classes to reduce boilerplate code.
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* Provides common patterns like converting lists of DynamoDB items to domain objects.
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*/
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public class ConvenienceMethodGenerator {
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/**
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* Generates convenience methods for common DynamoDB operations.
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* Generates convenience methods for common DynamoDB operations using JavaPoet.
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*/
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public void generateConvenienceMethods(PrintWriter writer, TypeInfo typeInfo) {
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public List<MethodSpec> generateConvenienceMethods(TypeInfo typeInfo) {
1721
String className = typeInfo.getClassName();
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ClassName attributeValue = ClassName.get(AttributeValue.class);
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ClassName domainClass = ClassName.bestGuess(className);
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writer.println(" // Convenience methods for reducing boilerplate");
20-
writer.println();
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List<MethodSpec> methods = new ArrayList<>();
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methods.add(generateFromDynamoDbItemMethod(className, domainClass, attributeValue));
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methods.add(generateFromDynamoDbItemsMethod(className, domainClass, attributeValue));
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methods.add(generateToDynamoDbItemMethod(className, domainClass, attributeValue));
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methods.add(generateToDynamoDbItemsMethod(className, domainClass, attributeValue));
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return methods;
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}
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generateFromDynamoDbItemMethod(writer, className);
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generateFromDynamoDbItemsMethod(writer, className);
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generateToDynamoDbItemMethod(writer, className);
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generateToDynamoDbItemsMethod(writer, className);
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private MethodSpec generateFromDynamoDbItemMethod(String className, ClassName domainClass, ClassName attributeValue) {
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return MethodSpec.methodBuilder("fromDynamoDbItem")
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.addModifiers(Modifier.PUBLIC)
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.returns(ParameterizedTypeName.get(ClassName.get("java.util", "Optional"), domainClass))
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.addParameter(ParameterizedTypeName.get(
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ClassName.get(Map.class),
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ClassName.get(String.class),
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attributeValue), "item")
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.addJavadoc("Convenience method to convert a single DynamoDB item to a domain object.\n")
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.addJavadoc("Handles the common pattern of mapping GetItemResponse.item() to domain objects.\n")
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.addJavadoc("\n")
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.addJavadoc("@param item DynamoDB item from GetItemResponse.item()\n")
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.addJavadoc("@return Optional of $L object, empty if item is null or conversion fails\n", className)
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.beginControlFlow("if (item == null || item.isEmpty())")
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.addStatement("return $T.empty()", ClassName.get("java.util", "Optional"))
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.endControlFlow()
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.addStatement("$T result = fromDynamoDbAttributeValue($T.builder().m(item).build())",
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domainClass, attributeValue)
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.addStatement("return $T.ofNullable(result)", ClassName.get("java.util", "Optional"))
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.build();
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}
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private void generateFromDynamoDbItemMethod(PrintWriter writer, String className) {
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writer.println(" /**");
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writer.println(" * Convenience method to convert a single DynamoDB item to a domain object.");
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writer.println(" * Handles the common pattern of mapping GetItemResponse.item() to domain objects.");
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writer.println(" *");
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writer.println(" * @param item DynamoDB item from GetItemResponse.item()");
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writer.println(" * @return Optional of " + className + " object, empty if item is null or conversion fails");
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writer.println(" */");
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writer.println(" public java.util.Optional<" + className + "> fromDynamoDbItem(Map<String, AttributeValue> item) {");
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writer.println(" if (item == null || item.isEmpty()) {");
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writer.println(" return java.util.Optional.empty();");
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writer.println(" }");
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writer.println(" " + className + " result = fromDynamoDbAttributeValue(AttributeValue.builder().m(item).build());");
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writer.println(" return java.util.Optional.ofNullable(result);");
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writer.println(" }");
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writer.println();
55+
private MethodSpec generateFromDynamoDbItemsMethod(String className, ClassName domainClass, ClassName attributeValue) {
56+
return MethodSpec.methodBuilder("fromDynamoDbItems")
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.addModifiers(Modifier.PUBLIC)
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.returns(ParameterizedTypeName.get(ClassName.get(List.class), domainClass))
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.addParameter(ParameterizedTypeName.get(
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ClassName.get(List.class),
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ParameterizedTypeName.get(
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ClassName.get(Map.class),
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ClassName.get(String.class),
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attributeValue)), "items")
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.addJavadoc("Convenience method to convert a list of DynamoDB items to domain objects.\\n")
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.addJavadoc("Handles the common pattern of mapping QueryResponse.items() to domain objects.\\n")
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.addJavadoc("\\n")
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.addJavadoc("@param items List of DynamoDB items from QueryResponse.items() or ScanResponse.items()\\n")
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.addJavadoc("@return List of $L objects, filtering out any null results\\n", className)
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.beginControlFlow("if (items == null || items.isEmpty())")
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.addStatement("return new $T<>()", ClassName.get("java.util", "ArrayList"))
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.endControlFlow()
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.addStatement("return items.stream()")
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.addStatement(" .map(item -> $T.builder().m(item).build())", attributeValue)
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.addStatement(" .map(this::fromDynamoDbAttributeValue)")
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.addStatement(" .filter($T::nonNull)", ClassName.get(Objects.class))
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.addStatement(" .collect($T.toList())", ClassName.get(Collectors.class))
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.build();
4479
}
4580

46-
private void generateFromDynamoDbItemsMethod(PrintWriter writer, String className) {
47-
writer.println(" /**");
48-
writer.println(" * Convenience method to convert a list of DynamoDB items to domain objects.");
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writer.println(" * Handles the common pattern of mapping QueryResponse.items() to domain objects.");
50-
writer.println(" *");
51-
writer.println(" * @param items List of DynamoDB items from QueryResponse.items() or ScanResponse.items()");
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writer.println(" * @return List of " + className + " objects, filtering out any null results");
53-
writer.println(" */");
54-
writer.println(" public List<" + className + "> fromDynamoDbItems(List<Map<String, AttributeValue>> items) {");
55-
writer.println(" if (items == null || items.isEmpty()) {");
56-
writer.println(" return new ArrayList<>();");
57-
writer.println(" }");
58-
writer.println(" return items.stream()");
59-
writer.println(" .map(item -> AttributeValue.builder().m(item).build())");
60-
writer.println(" .map(this::fromDynamoDbAttributeValue)");
61-
writer.println(" .filter(Objects::nonNull)");
62-
writer.println(" .collect(Collectors.toList());");
63-
writer.println(" }");
64-
writer.println();
81+
private MethodSpec generateToDynamoDbItemMethod(String className, ClassName domainClass, ClassName attributeValue) {
82+
return MethodSpec.methodBuilder("toDynamoDbItem")
83+
.addModifiers(Modifier.PUBLIC)
84+
.returns(ParameterizedTypeName.get(
85+
ClassName.get(Map.class),
86+
ClassName.get(String.class),
87+
attributeValue))
88+
.addParameter(domainClass, "object")
89+
.addJavadoc("Convenience method to convert a single domain object to a DynamoDB item.\\n")
90+
.addJavadoc("Useful for PutItem operations.\\n")
91+
.addJavadoc("\\n")
92+
.addJavadoc("@param object The $L object to convert\\n", className)
93+
.addJavadoc("@return DynamoDB item (Map<String, AttributeValue>), or null if input is null or conversion fails\\n")
94+
.beginControlFlow("if (object == null)")
95+
.addStatement("return null")
96+
.endControlFlow()
97+
.addStatement("$T av = toDynamoDbAttributeValue(object)", attributeValue)
98+
.addStatement("return av != null ? av.m() : null")
99+
.build();
65100
}
66101

67-
private void generateToDynamoDbItemMethod(PrintWriter writer, String className) {
68-
writer.println(" /**");
69-
writer.println(" * Convenience method to convert a single domain object to a DynamoDB item.");
70-
writer.println(" * Useful for PutItem operations.");
71-
writer.println(" *");
72-
writer.println(" * @param object The " + className + " object to convert");
73-
writer.println(" * @return DynamoDB item (Map<String, AttributeValue>), or null if input is null or conversion fails");
74-
writer.println(" */");
75-
writer.println(" public Map<String, AttributeValue> toDynamoDbItem(" + className + " object) {");
76-
writer.println(" if (object == null) {");
77-
writer.println(" return null;");
78-
writer.println(" }");
79-
writer.println(" AttributeValue av = toDynamoDbAttributeValue(object);");
80-
writer.println(" return av != null ? av.m() : null;");
81-
writer.println(" }");
82-
writer.println();
102+
private MethodSpec generateToDynamoDbItemsMethod(String className, ClassName domainClass, ClassName attributeValue) {
103+
return MethodSpec.methodBuilder("toDynamoDbItems")
104+
.addModifiers(Modifier.PUBLIC)
105+
.returns(ParameterizedTypeName.get(
106+
ClassName.get(List.class),
107+
ParameterizedTypeName.get(
108+
ClassName.get(Map.class),
109+
ClassName.get(String.class),
110+
attributeValue)))
111+
.addParameter(ParameterizedTypeName.get(ClassName.get(List.class), domainClass), "objects")
112+
.addJavadoc("Convenience method to convert a list of domain objects to DynamoDB items.\\n")
113+
.addJavadoc("Useful for batch operations like batchWriteItem.\\n")
114+
.addJavadoc("\\n")
115+
.addJavadoc("@param objects List of $L objects to convert\\n", className)
116+
.addJavadoc("@return List of DynamoDB items (Map<String, AttributeValue>), filtering out any null results\\n")
117+
.beginControlFlow("if (objects == null || objects.isEmpty())")
118+
.addStatement("return new $T<>()", ClassName.get("java.util", "ArrayList"))
119+
.endControlFlow()
120+
.addStatement("return objects.stream()")
121+
.addStatement(" .map(this::toDynamoDbAttributeValue)")
122+
.addStatement(" .filter($T::nonNull)", ClassName.get(Objects.class))
123+
.addStatement(" .map(av -> av.m())")
124+
.addStatement(" .filter(map -> map != null && !map.isEmpty())")
125+
.addStatement(" .collect($T.toList())", ClassName.get(Collectors.class))
126+
.build();
83127
}
84128

85-
private void generateToDynamoDbItemsMethod(PrintWriter writer, String className) {
86-
writer.println(" /**");
87-
writer.println(" * Convenience method to convert a list of domain objects to DynamoDB items.");
88-
writer.println(" * Useful for batch operations like batchWriteItem.");
89-
writer.println(" *");
90-
writer.println(" * @param objects List of " + className + " objects to convert");
91-
writer.println(" * @return List of DynamoDB items (Map<String, AttributeValue>), filtering out any null results");
92-
writer.println(" */");
93-
writer.println(" public List<Map<String, AttributeValue>> toDynamoDbItems(List<" + className + "> objects) {");
94-
writer.println(" if (objects == null || objects.isEmpty()) {");
95-
writer.println(" return new ArrayList<>();");
96-
writer.println(" }");
97-
writer.println(" return objects.stream()");
98-
writer.println(" .map(this::toDynamoDbAttributeValue)");
99-
writer.println(" .filter(Objects::nonNull)");
100-
writer.println(" .map(av -> av.m())");
101-
writer.println(" .filter(map -> map != null && !map.isEmpty())");
102-
writer.println(" .collect(Collectors.toList());");
103-
writer.println(" }");
104-
writer.println();
129+
/**
130+
* @deprecated Use generateConvenienceMethods(TypeInfo) instead
131+
*/
132+
@Deprecated
133+
public void generateConvenienceMethods(java.io.PrintWriter writer, TypeInfo typeInfo) {
134+
List<MethodSpec> methods = generateConvenienceMethods(typeInfo);
135+
for (MethodSpec method : methods) {
136+
String[] lines = method.toString().split("\\n");
137+
for (String line : lines) {
138+
if (!line.trim().isEmpty()) {
139+
writer.println(" " + line);
140+
} else {
141+
writer.println();
142+
}
143+
}
144+
}
105145
}
106146
}

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