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package bjc.utils.funcdata;
import java.util.StringTokenizer;
import java.util.function.Consumer;
import java.util.function.Function;
/**
* A string tokenizer that exposes a functional interface
*
* @author ben
*
*/
public class FunctionalStringTokenizer {
/**
* Create a new tokenizer from the specified string.
*
* @param strang
* The string to create a tokenizer from.
* @return A new tokenizer that splits the provided string on spaces.
*/
public static FunctionalStringTokenizer fromString(String strang) {
if(strang == null) throw new NullPointerException("String to tokenize must be non-null");
return new FunctionalStringTokenizer(new StringTokenizer(strang, " "));
}
/*
* The string tokenizer being driven
*/
private StringTokenizer input;
/**
* Create a functional string tokenizer from a given string
*
* @param inp
* The string to tokenize
*/
public FunctionalStringTokenizer(String inp) {
if(inp == null) throw new NullPointerException("String to tokenize must be non-null");
this.input = new StringTokenizer(inp);
}
/**
* Create a functional string tokenizer from a given string and set of
* separators
*
* @param input
* The string to tokenize
* @param seperators
* The set of separating tokens to use for splitting
*/
public FunctionalStringTokenizer(String input, String seperators) {
if(input == null)
throw new NullPointerException("String to tokenize must not be null");
else if(seperators == null) throw new NullPointerException("Tokens to split on must not be null");
this.input = new StringTokenizer(input, seperators);
}
/**
* Create a functional string tokenizer from a non-functional one
*
* @param toWrap
* The non-functional string tokenizer to wrap
*/
public FunctionalStringTokenizer(StringTokenizer toWrap) {
if(toWrap == null) throw new NullPointerException("Wrapped tokenizer must not be null");
this.input = toWrap;
}
/**
* Execute a provided action for each of the remaining tokens
*
* @param action
* The action to execute for each token
*/
public void forEachToken(Consumer<String> action) {
if(action == null) throw new NullPointerException("Action must not be null");
while(input.hasMoreTokens()) {
action.accept(input.nextToken());
}
}
/**
* Get the string tokenizer encapsulated by this tokenizer
*
* @return The encapsulated tokenizer
*/
public StringTokenizer getInternal() {
return input;
}
/**
* Check if this tokenizer has more tokens
*
* @return Whether or not this tokenizer has more tokens
*/
public boolean hasMoreTokens() {
return input.hasMoreTokens();
}
/**
* Return the next token from the tokenizer.
*
* Returns null if no more tokens are available
*
* @return The next token from the tokenizer
*/
public String nextToken() {
if(input.hasMoreTokens()) // Return the next available token
return input.nextToken();
// Return no token
return null;
}
/**
* Convert this tokenizer into a list of strings
*
* @return This tokenizer, converted into a list of strings
*/
public IList<String> toList() {
return toList((String element) -> element);
}
/**
* Convert the contents of this tokenizer into a list. Consumes all of
* the input from this tokenizer.
*
* @param <E>
* The type of the converted tokens
*
* @param transformer
* The function to use to convert tokens.
* @return A list containing all of the converted tokens.
*/
public <E> IList<E> toList(Function<String, E> transformer) {
if(transformer == null) throw new NullPointerException("Transformer must not be null");
IList<E> returned = new FunctionalList<>();
// Add each token to the list after transforming it
forEachToken(token -> {
E transformedToken = transformer.apply(token);
returned.add(transformedToken);
});
return returned;
}
}
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