I would like to remove a certain element from an array in Velocity Template Language. I did not find any appropriate method looking through the documentation of Apache VTL, that's why I am asking here for help. I have tried following (.remove() doesn't seem to be a method on array items):
#set($linkedWIARRAY = ["ABC-123, DEF-345, GHI-678"])
#set($dummy=$linkedWIARRAY.add("JKL-901"))
#set($dummy = $linkedWIARRAY.remove("DEF-345"))
$linkedWIARRAY
$linkedWIARRAY returns [ABC-123, DEF-345, GHI-678, JKL-901], showing that remove very likely doesn't exist as method on arrays ;)
There is a similar question on SO, that didn't help me:
velocity template drop element from array
The problem lies in the initialization of the list. It should be:
#set($linkedWIARRAY = ["ABC-123", "DEF-345", "GHI-678"])
that is, each string should be enclosed in double quotes, not the whole string.
Related
Edit: Figured it out, check my posted answer if you're having similar issues.
I know there are several questions about this issue, but none of their solutions are working for me.
In my model class I have made sure to use List instead of Arraylist to avoid Firebase issues, but am still getting this error. It's a lot of code but most questions ask for all the code so I'll post it all.
TemplateModelClass.java
//
I've used this basic model successfully many times. For the
HashMaps<String, List<String>>,
the String is an incremented Integer converted to String. The List's are just Strings in a List. Here's some sample JSON from Firebase:
//
Formatted that as best as I could. If you need a picture of it let me know and I'll get a screenshot
And am getting this error, as stated in the title:
com.google.firebase.database.DatabaseException: Expected a Map while deserializing, but got a class java.util.ArrayList
The most upvoted question about this seems to have something to do with a problem using an integer as a key, but I think I've avoided that by always using an integer converted to a string. It may be interpreting it strangely, so I'll try some more stuff in the meantime. Thanks for reading!
Alright, figured it out. If anyone reading this has this problem and are using incremented ints/longs/whatever that get converted to strings, you must add some characters to the converted int. Firebase apparently converts these keys back into non-Strings if it can be converted.
For example, if you do something like this:
int inc = 0;
inc++; // 1
map.put(String.valueOf(inc), someList);
Firebase interprets that key as 1 instead of "1".
So, to force Fb to intepret as a string, do something like this:
int inc = 0;
inc++; // 1
map.put(String.valueOf(inc) + "_key", someList);
And everything works out perfectly. Obviously if you also need to read those Strings back to ints, just split the string with "[_]" and you're good to go.
The main issue is that you are using a List instead of a Map. As your error said, while deserializing it is expectig a Map but is found an ArrayList.
So in order to solve this problem youd need to change all the lists in your model with maps like this:
private Map<String, Object> mMapOne;
After changing all those fileds like this, you need also to change your public setters and getters.
Hope it helps.
Example A:
I need to make below object as dynamic as possible, in order to have robust/flexibility. this is an upload button, but the value of element tend to change for time being:
xpath="//input[#id='**j_idt162:input**'] ,
so i tried below :
xpath="//input[#id='j_idt[0-9],{1,4}:input']
Example B:
i have lists of caseIDs, i only need to get one of it. doesnt matter from the top or down. instead of using static below
xpath = "//a[contains(.,'3131')]")
i tried this
xpath = "//a[contains(.,'^[0-9]{1,5}$')]"), "index:=0"
none of above is working, Example A, i tried to only give 4 digit number but range is dynamic.
Example B, I'm trying to let it pick up only first one link with with limited to range 5, for instance (12345)'
Thanks in advance for answering
HTML node example
It's not possible to use Regex in XPath 1.0, and most browsers support XPath 1.0 only.
You'd better use prefix and suffix in class or id. Then use start-with() and end-with() or contains() to find the element.
For example,
//*[starts-with(#id, 'sometext') and ends-with(#id, '_text')]
Check this answer.
When debugging a java program in Eclipse, I can see (e.g. in the Variables view) the content of an arbitrary array, see the picture bellow (with the ByteArrayInputStream.buf field).
But I cannot find the array length field anywhere. Is there a way to show the length of an array in Eclipse debugger? How can I do it?
You can use the "Expressions" view and evaluate the length member:
Keep in mind that the last index is one less than the length!
While this works for public array members, it seems that an explicit cast is required for protected members. Consider the following code:
...
ByteArrayInputStream is = new ByteArrayInputStream(new byte[1769]);
...
Now, when evaluating is.buf, the Expressions view shows a dump of the array as shown in the question, but evaluating is.buf.length fails with <error(s)_during_the_evaluation>. If we add an explicit cast to ByteArrayInputStream, the evaluation works:
Thank you #ThorbjørnRavnAndersen for your answer (comment). You are right, the latest array segment (in my case: [1700..1768]) holds the length.
The whole picture:
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Given a string I #eat# #hamburgers# and a StringBuilder eat: [eat, consume, like] hamburgers: [hamburgers, spinach, bananas], I want to randomly replace the words within hashmarks with randomly chosen ones from their wordbanks, so that phrases such as I like bananas and I consume spinach will be generated. Code to randomly select another word, given a token (i.e. eat, hamburgers) has been written.
I need to use this regex #[^#]+# to find words within the initial string contained by hashmarks, pass them to the replace method, and then put their random correlates back inside the initial string. I tried using StringTokenizer, but realized it's not the tool for the job.
I need to somehow extract the first word within hashmarks and pass it to the method calling for its replacement before calling the method archetypeString(#[^#]+#, replacement) in such a way so that when the loop runs again, both the word grabber&passer-to method and the replacement method are then working with the second hashed word.
tokenizer dead-end:
StringTokenizer stt = new StringTokenizer(archetype);
while(stt.hasMoreTokens()){
String temp = stt.nextToken();
if(temp.charAt(0)=='#');
}
and the getPhrase method:
public List<String> getPhrases(StringBuilder fileContent, String token) {
StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(fileContent.toString()));
List<String> list = new ArrayList<String>();
try {
while (tokenizer.nextToken() != StreamTokenizer.TT_EOF) {
if (tokenizer.sval.equals(token)) {
tokenizer.nextToken(); // '['
do {
tokenizer.nextToken(); // go to the number
list.add(String.valueOf(tokenizer.sval));
} while (tokenizer.nextToken() == ',');
break;
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
I need to use this regex #[^#]+# to find words within the initial string contained by hashmarks, pass them to the replace method, and then put their random correlates back inside the initial string. I tried using StringTokenizer, but realized it's not the tool for the job.
It is not clear from your question whether this is part of some sadistic homework assignment or just the first way you thought of to solve whatever problem you're trying to solve. This is not a regular expression problem any more than it's a StringTokenizer problem.
Look at String.format(), and the formatting capabilities of Formatter. I do not understand why you would ever need to know what the last string you generated was if your object is to generate the next one at random. Just pick a new random value and format it with String.format().
--
After reading your comment to this answer and looking at the question you referred to, I'm going to make a couple of recommendations.
(1) start with a simpler coding assignment or two, something without regular expressions. Make sure you absolutely understand the following concepts: instance variables. variable scope. public methods versus private methods. passing parameters to methods, and returning values from methods. You can do quite a bit with just that much. You don't need to study inheritance until you have all of those down cold, and I recommend that you do not try.
(2) for each coding assignment for at least your first 5, make sure you have written out what your program is to be provided as data and what output it is supposed to produce. List any constraints someone has given you separately (must use class X, must display error message, whatever).
(3) Put opening braces and closing braces on lines by themselves; match each opening brace with a closing brace indented the same amount. Indent code within each pair of braces another 2 or 3 spaces further to the right. This means that brace pairs inside other brace pairs will be indented further. I know this is not the way you see most code, and plenty of people will tell you that it is "wrong". But until you get comfortable with scope and whether a given place in your code is inside or outside a method or a loop, I think it best that you give yourself these extra visual cues. For someone not familiar with other ways of doing things, this is easiest.
(4) be careful of your terms when posting here. In the other question you refer to, you say it is about inheritance, but it uses "implements", indicating that it is implementing an interface, not inheriting from a class. It is confusing to those of us trying to help you if you get the terminology wrong.
(5) when you post here: post the entire program (these early assignments should all be under 100 lines total, no reason not to post all of it). Make sure it is properly indented; use spaces instead of tabs. In text, and maybe also in comments, point out the place in the code where you seem to have the problem (if you know). If there is an error message, post the entire error message (don't tell us what it is, and don't try to interpret it for us). Work on your code until you have a specific question: why do I get a compile error here? Why do I get (or fail to get) this output? The program outputs X but I expected Y, why is that? etc.
We're not a tutorial shop; most of us need instruction to learn to program, and you need to get most of that somewhere besides here. We are willing to help with your questions, given that your questions are specific and reasonable and you aren't expecting us to provide the instruction. By itself, "I'm lost and need help" is a bit beyond StackOverflow's normal way of operating.
what do I obtain if I call IndexReader.getTermFrequenciesVector(...) on an index created with TermVector.YES option?
The documentation already answers this, as Xodorap notes in a comment.
The TermFreqVector object returned can retrieve which terms (words produced by your analyzer) a field contains and how many times each of those terms exists within that field.
You can cast the returned TermFreqVector to the interface TermPositionVector if you index the field using TermVector.WITH_OFFSETS, TermVector.WITH_POSITIONS or TermVector.WITH_POSITIONS_OFFSETS. This gives you access to GetTermPositions with allow you to check where in the field the term exists, and GetOffsets which allows you to check where in the original content the term originated from. The later allows, combined with Store.YES, highlighting of matching terms in a search query.
There are different contributed highlighters available under Contrib area found at the Lucene homepage.
Or you can implement proximity or first occurrence type score contributions. Which highlighting won't help you with at all.