getTreeRelationSearch
MethodgetTreeRelationSearch
method efficiently retrieves specific FieLdsModel
objects from a hierarchical data structure based on provided criteria.The getTreeRelationSearch
method is a Java function designed to navigate and retrieve specific FieLdsModel
objects from a potentially complex hierarchical data structure. By processing a list of FieLdsModel
instances and a treeRelationField
string, the method distinguishes between child and non-child nodes to accurately locate the desired object.
The method signature provides an overview of its purpose and the parameters it accepts:
public FieLdsModel getTreeRelationSearch(List<FieLdsModel> FieLdsModels, String treeRelationField)
FieLdsModels
: A list containing instances of FieLdsModel
, representing a collection of field models within a hierarchical or flat structure.treeRelationField
: A string that specifies the field to search for, potentially indicating a relationship within a tree-like structure.The method's primary objective is to search through the provided list of FieLdsModel
objects and return a specific instance that matches the criteria defined by treeRelationField
.
The method begins by initializing a new instance of FieLdsModel
:
FieLdsModel fieLdsModel = new FieLdsModel();
This object serves as a placeholder for the result of the search operation.
The method checks whether the treeRelationField
indicates a child node:
boolean treeIsChild = treeRelationField.toLowerCase().contains(JnpfKeyConsts.CHILD_TABLE_PREFIX);
Here, CHILD_TABLE_PREFIX
is a constant likely defined within the JnpfKeyConsts
class, representing a specific prefix that denotes child relationships within the tree structure.
If the treeRelationField
signifies a child node, the method executes the following steps:
Extracting Identifiers:
String tableField = treeRelationField.substring(0, treeRelationField.indexOf("-"));
String relationVmodel = treeRelationField.substring(treeRelationField.indexOf("-") + 1);
The method splits the treeRelationField
into tableField
and relationVmodel
, which represent the parent and child identifiers, respectively.
Flattening the Hierarchical Structure:
List<FieLdsModel> allFields = new ArrayList<>();
recursionFields(FieLdsModels, allFields);
A new list, allFields
, is created to store all fields extracted from the hierarchical FieLdsModels
list through a recursive method recursionFields
.
Filtering for the Desired Model:
fieLdsModel = allFields.stream()
.filter(swap -> relationVmodel.equalsIgnoreCase(swap.getVModel())
&& tableField.equals(swap.getConfig().getParentVModel()))
.findFirst()
.orElse(null);
The method utilizes Java Streams to filter allFields
, searching for a FieLdsModel
where both the vModel
matches relationVmodel
and the parentVModel
within the configuration matches tableField
. If a match is found, it is assigned to fieLdsModel
; otherwise, null
is assigned.
If the treeRelationField
does not denote a child node, the method proceeds as follows:
Flattening the Hierarchical Structure:
List<FieLdsModel> allFields = new ArrayList<>();
this.recursionFields(FieLdsModels, allFields);
Similar to the child node processing, the method flattens the FieLdsModels
into a single list, allFields
.
Filtering for the Desired Model:
fieLdsModel = allFields.stream()
.filter(swap -> treeRelationField.equalsIgnoreCase(swap.getVModel()))
.findFirst()
.orElse(null);
The method filters allFields
to find a FieLdsModel
where the vModel
directly matches the treeRelationField
. The first match is assigned to fieLdsModel
; if none is found, null
is assigned.
return fieLdsModel;
The method concludes by returning the fieLdsModel
object, which is either the found model or null
if no match was identified.
While the current implementation of the getTreeRelationSearch
method is functional, several enhancements can be made to improve its robustness, readability, and efficiency:
Ensuring that the input parameters are not null
prevents potential NullPointerException
scenarios:
if (FieLdsModels == null || treeRelationField == null || treeRelationField.isEmpty()) {
return null; // Alternatively, throw an IllegalArgumentException for invalid inputs.
}
Replacing hardcoded strings with constants enhances code clarity and maintainability. Additionally, validating the presence of expected delimiters prevents runtime exceptions:
private static final String RELATION_DELIMITER = "-";
if (treeIsChild) {
if (!treeRelationField.contains(RELATION_DELIMITER)) {
return null; // Validates that the delimiter is present before splitting.
}
String tableField = treeRelationField.substring(0, treeRelationField.indexOf(RELATION_DELIMITER));
String relationVmodel = treeRelationField.substring(treeRelationField.indexOf(RELATION_DELIMITER) + 1);
// Continue with processing...
}
Encapsulating stream filtering logic within a dedicated method enhances reusability and readability:
private static FieLdsModel findMatchingField(List<FieLdsModel> allFields, String vModel, String parentVModel) {
return allFields.stream()
.filter(swap -> vModel.equalsIgnoreCase(swap.getVModel()) &&
(parentVModel == null || parentVModel.equals(swap.getConfig().getParentVModel())))
.findFirst()
.orElse(null);
}
This method can then be utilized within getTreeRelationSearch
to streamline the filtering process.
Refactoring the recursionFields
method to return a flattened list without side effects improves its robustness:
private List<FieLdsModel> recursionFields(List<FieLdsModel> source) {
List<FieLdsModel> target = new ArrayList<>();
for (FieLdsModel fieLd : source) {
target.add(fieLd);
if (fieLd.getConfig().getChildren() != null) {
target.addAll(recursionFields(fieLd.getConfig().getChildren()));
}
}
return target;
}
Initializing fieLdsModel
as null
directly avoids unnecessary object creation:
FieLdsModel fieLdsModel = null;
Incorporating the aforementioned improvements results in a more efficient and maintainable implementation:
public FieLdsModel getTreeRelationSearch(List<FieLdsModel> FieLdsModels, String treeRelationField) {
if (FieLdsModels == null || treeRelationField == null || treeRelationField.isEmpty()) {
return null;
}
boolean treeIsChild = treeRelationField.toLowerCase().contains(JnpfKeyConsts.CHILD_TABLE_PREFIX);
List<FieLdsModel> allFields = recursionFields(FieLdsModels);
if (treeIsChild) {
if (!treeRelationField.contains("-")) return null; // Validate separator is present
String tableField = treeRelationField.substring(0, treeRelationField.indexOf("-"));
String relationVmodel = treeRelationField.substring(treeRelationField.indexOf("-") + 1);
return findMatchingField(allFields, relationVmodel, tableField);
} else {
return findMatchingField(allFields, treeRelationField, null);
}
}
private List<FieLdsModel> recursionFields(List<FieLdsModel> source) {
List<FieLdsModel> target = new ArrayList<>();
for (FieLdsModel fieLd : source) {
target.add(fieLd);
if (fieLd.getConfig().getChildren() != null) {
target.addAll(recursionFields(fieLd.getConfig().getChildren()));
}
}
return target;
}
private static FieLdsModel findMatchingField(List<FieLdsModel> allFields, String vModel, String parentVModel) {
return allFields.stream()
.filter(swap -> vModel.equalsIgnoreCase(swap.getVModel()) &&
(parentVModel == null || parentVModel.equals(swap.getConfig().getParentVModel())))
.findFirst()
.orElse(null);
}
The getTreeRelationSearch
method serves as a pivotal function for navigating and extracting specific FieLdsModel
objects within a hierarchical data structure. By implementing the suggested optimizations and adhering to best coding practices, the method's efficiency, readability, and maintainability can be significantly enhanced. These improvements not only bolster the method's robustness against potential runtime issues but also facilitate easier future enhancements and scalability.