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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 s
* The string to create a tokenizer from.
* @return A new tokenizer that splits the provided string on spaces.
*/
public static FunctionalStringTokenizer fromString(String s) {
return new FunctionalStringTokenizer(new StringTokenizer(s, " "));
}
/**
* The string tokenizer being driven
*/
private StringTokenizer inp;
/**
* Create a functional string tokenizer from a given string
*
* @param inp
* The string to tokenize
*/
public FunctionalStringTokenizer(String inp) {
this.inp = new StringTokenizer(inp);
}
/**
* Create a functional string tokenizer from a given string and set of
* seperators
*
* @param inp
* The string to tokenize
* @param seps
* The string to use for splitting
*/
public FunctionalStringTokenizer(String inp, String seps) {
this.inp = new StringTokenizer(inp, seps);
}
/**
* Create a functional string tokenizer from a non-functional one
*
* @param inp
* The non-functional string tokenizer to wrap
*/
public FunctionalStringTokenizer(StringTokenizer inp) {
this.inp = inp;
}
/**
* Execute a provided action for each of the remaining tokens
*
* @param f
* The action to execute for each token
*/
public void forEachToken(Consumer<String> f) {
while (inp.hasMoreTokens()) {
f.accept(inp.nextToken());
}
}
/**
* Get the string tokenizer encapsuled by this
*
* @return The encapsulated tokenizer
*/
public StringTokenizer getInternal() {
return inp;
}
/**
* 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() {
return inp.hasMoreTokens() ? inp.nextToken() : null;
}
/**
* 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 f
* The function to use to convert tokens.
* @return A list containing all of the converted tokens.
*/
public <E> FunctionalList<E> toList(Function<String, E> f) {
FunctionalList<E> r = new FunctionalList<>();
forEachToken(tk -> r.add(f.apply(tk)));
return r;
}
/**
* Check if this tokenizer has more tokens
*
* @return Whether or not this tokenizer has more tokens
*/
public boolean hasMoreTokens() {
return inp.hasMoreTokens();
}
}
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