exceptions-readandwrite/src/main/java/rocks/zipcode/AlphaCharDocument.java

package rocks.zipcode;

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author leon on 16/11/2018.
 */
public class AlphaCharDocument extends Document {
    public AlphaCharDocument(String fileName) throws IOException {
        super(fileName);
    }

    @Override
    public void write(String contentToBeWritten) {

        if (this.isAlpha(contentToBeWritten)==true){
           super.write(contentToBeWritten);


        }else{
            throw  new  IllegalArgumentException();

        }


    }

    private Boolean isAlpha(String s) {
        Pattern pattern = Pattern.compile("[a-z]", Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(s);
        boolean b = matcher.find();
        return b;



    }
}