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

package rocks.zipcode;

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

/**
 * @author leon on 18/11/2018.
 */
public class SpecialCharDocument extends Document {
    public SpecialCharDocument(String fileName) throws IOException {
        super(fileName);
    }

    @Override
    public void write(String contentToBeWritten) {
        if(isSpecialCharacters(contentToBeWritten)) {
            super.write(contentToBeWritten);
        } else {
            throw new IllegalArgumentException();
        }
    }

    private Boolean isSpecialCharacters(String s) {

        Pattern pattern = Pattern.compile("^[!@#$%^&*()_ ]+$");
        Matcher match = pattern.matcher(s);
        return match.find();
    }
}