replace.java

package edit;

// import the necessary libraries.
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;

/**
 * Simple custom JSP tag that prints a copyright where inserted.
 *
 * 12/18/2001 jonesbr@email.uc.edu
 **/

public class Replace extends BodyTagSupport {

    String remove = new String();
    String add = new String();
 
    /**
     * method doAfterBody
     *
     * Gets the body between the tags, replaces the remove text with the add text.
     *
     * @author jonesbr@email.uc.edu
     * date December 30, 2001
     */
 
    public int doAfterBody() {
        try {
            // Get the BodyContent object to manipulate the body.
            BodyContent body = getBodyContent();

            // Call the change method to swap these values.
            String newBody = change(body.getString(), remove, add);
 
            // Get the output stream so that we can write the new body out.
            JspWriter out = body.getEnclosingWriter();
            out.print(newBody);
        } catch (IOException e) {
            System.out.println("IOException in Replace: " + e);
        } catch (Exception e) {
            System.out.println("Exception in Replace " + e);
        }
        // Let them know I'm finished.
        return(SKIP_BODY);
    }
 
    private String change(String body, String remove, String add) {
        StringBuffer returnString = new StringBuffer();
        int fromIndex = 0;
 
        int location = body.indexOf(remove, fromIndex);
        while(location != -1) {
            returnString.append(body.substring(fromIndex, location));
            returnString.append(add);
            fromIndex = location + remove.length();
            location = body.indexOf(remove, fromIndex);
        }
 
        // Add the last chunk, or the whole thing if remove was never present.
        returnString.append(body.substring(fromIndex, body.length()));
 
        return returnString.toString();
 
    }
 
 
 
    // setter method for the remove attribute.
    public void setRemove(String remove) {
        this.remove = remove;
    }
 
 
    // setter method for the add attribute.
    public void setAdd(String add) {
        this.add = add;
    }

// End the class.
}

 Back
 

Created by:  Brandan Jones December 17, 2001