StringReader.java

package chatty.util.commands;

/**
 * Allows reading the given String character by character.
 * 
 * @author tduva
 */
public class StringReader {
    
    private final String string;
    
    private int index = -1;
    
    public StringReader(String string) {
        this.string = string;
    }
    
    /**
     * Checks if there is a next character available.
     * 
     * @return 
     */
    public boolean hasNext() {
        return string.length() > index + 1;
    }
    
    /**
     * Return the next character and advance the read index.
     * 
     * @return 
     */
    public String next() {
        index++;
        return string.substring(index, index+1);
    }
    
    /**
     * Return the next character, but don't advance the read index.
     * 
     * @return 
     */
    public String peek() {
        return string.substring(index+1, index+2);
    }
    
    public String last() {
        return string.substring(index, index+1);
    }
    
    /**
     * The current read index.
     * 
     * @return 
     */
    public int pos() {
        return index;
    }
    
    public static void main(String[] args) {
        StringReader reader = new StringReader("abc");
        System.out.println(reader.next());
        System.out.println(reader.peek());
        System.out.println(reader.next());
        System.out.println(reader.next());
        System.out.println(reader.next());
    }
    
}