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package bjc.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(final 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 final StringTokenizer input;
/**
* Create a functional string tokenizer from a given string.
*
* @param inp
* The string to tokenize.
*/
public FunctionalStringTokenizer(final 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(final String input, final 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(final 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(final 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.
*
* @return The next token from the tokenizer, or null if no more tokens are
* available.
*/
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((final 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(final Function<String, E> transformer) {
if (transformer == null)
throw new NullPointerException("Transformer must not be null");
final IList<E> returned = new FunctionalList<>();
/* Add each token to the list after transforming it. */
forEachToken(token -> {
final E transformedToken = transformer.apply(token);
returned.add(transformedToken);
});
return returned;
}
@Override
public String toString() {
return String.format("FunctionalStringTokenizer [input=%s]", input);
}
}
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