I want to filter a list based on 4 parameters. But I cannot get the expected output that I want.
If more than one parameter is not empty or null, I want the multiple if-else relation become AND.
If only one parameter has value, then the relation will be OR.
Case 1: When tagUId is not empty and status is not null
Input:
title = “”, tagUId = “12”, status = true, pullStatus = null
Expected Output:
Only tag with tagUId contains “12” AND status is true will be included into the result list.
Case 2: When tagUId is not empty, status is not null, pullStatus is not null
Input:
title = “”, tagUId = “12”, status = true, pullStatus = false
Expected Output:
Only tag with tagUId contains “12” AND status is true AND pullStatus is false will be included into the result list.
public static ArrayList<TagEntity> SearchTagsBy(String title, String tagUId, Boolean status, Boolean pullStatus){
HashSet<TagEntity> result = new HashSet<>();
ArrayList<TagEntity> tags = GetTagList();
if (title.isEmpty() && tagUId.isEmpty() && status == null && pullStatus == null) {
result.addAll(tags); //default parameters == show all tag
}else{
if(!title.isEmpty()){
result.addAll(FilterTitle(tags, title));
}
if(!tagUId.isEmpty()){
result.addAll(FilterTagUId(tags, tagUId));
}
if(status != null){
result.addAll(FilterStatus(tags, status));
}
if(pullStatus != null){
result.addAll(FilterPullStatus(tags, pullStatus));
}
}
return new ArrayList<>(result);
}
private static Collection<? extends TagEntity> FilterPullStatus(ArrayList<TagEntity> tags, Boolean pullStatus) {
HashSet<TagEntity> result = new HashSet<>();
for (TagEntity tag: tags) {
if (tag.getHasPulled().equals(pullStatus)){
result.add(tag);
}
}
return result;
}
private static Collection<? extends TagEntity> FilterStatus(ArrayList<TagEntity> tags, Boolean status) {
HashSet<TagEntity> result = new HashSet<>();
for (TagEntity tag: tags) {
if (tag.getStatus().equals(status)){
result.add(tag);
}
}
return result;
}
private static Collection<? extends TagEntity> FilterTagUId(ArrayList<TagEntity> tags, String tagUId) {
HashSet<TagEntity> result = new HashSet<>();
for (TagEntity tag: tags) {
if (tag.getUId().contains(tagUId)){
result.add(tag);
}
}
return result;
}
private static HashSet<TagEntity> FilterTitle(ArrayList<TagEntity> tags, String title){
HashSet<TagEntity> result = new HashSet<>();
for (TagEntity tag: tags) {
if (tag.getTitle().contains(title)){
result.add(tag);
}
}
return result;
}
Answer
Try this;
public static ArrayList<TagEntity> SearchTagsBy(String title, String tagUId, Boolean status, Boolean pullStatus){
ArrayList<TagEntity> result = new ArrayList<>();
ArrayList<TagEntity> tags = GetTagList();
for(TagEntity tag: tags)
{
boolean checkTitle, checkUId, checkStatus, checkPullStatus;
if(title.isEmpty()) checkTitle = true; else checkTitle = tag.getTitle().contains(title);
if(tagUId.isEmpty()) checkUId = true; else checkUId = tag.getUId().contains(tagUId);
if(status == null)checkStatus = true; else checkStatus = tag.getStatus().equals(status);
if(pullStatus == null)checkPullStatus = true; else checkPullStatus = tag.getHasPulled().equals(pullStatus);
if( checkTitle && checkUId && checkStatus && checkPullStatus)
result.add(tag);
}
return result;
}