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

package rocks.zipcode;

import java.io.IOException;

/**
 * @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 (isAlpha(contentToBeWritten)){
            super.write(contentToBeWritten);

        }else{
            throw new IllegalArgumentException();
        }
    }

    private Boolean isAlpha(String s) {
        return (s.matches("[a-zA-z ]+"));
    }
}