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Java REPL is a simple Read-Eval-Print-Loop for Java language.

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package javarepl.completion;

import com.googlecode.totallylazy.Sequence;

import static com.googlecode.totallylazy.Strings.startsWith;
import static javarepl.completion.CompletionCandidate.asCompletionCandidate;

public class StringCompleter extends Completer {
    private final Sequence candidates;

    public StringCompleter(Sequence candidates) {
        this.candidates = candidates;
    }

    @Override
    public CompletionResult call(String expression) throws Exception {
        int lastSpace = expression.lastIndexOf(" ") + 1;
        return new CompletionResult(expression, lastSpace,
                candidates.filter(startsWith(expression.substring(lastSpace))).map(asCompletionCandidate()));
    }
}