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package nonjsp.taglib;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
/**
* <p>Tag handler for <escapeHtml>
*
* @author Pierre Delisle
* @version $Revision: 1.5 $ $Date: 2007/04/27 22:00:36 $
*/
public class EscapeHtmlTag extends BodyTagSupport {
//*********************************************************************
// Instance variables
private Reader reader;
private Writer writer;
//*********************************************************************
// Constructors
public EscapeHtmlTag() {
super();
init();
}
private void init() {
reader = null;
writer = null;
}
//*********************************************************************
// Tag's properties
/** Tag's 'reader' attribute */
public void setReader(Reader reader) {
this.reader = reader;
}
/** Tag's 'writer' attribute */
public void setWriter(Writer writer) {
this.writer = writer;
}
//*********************************************************************
// TagSupport methods
public int doEndTag() throws JspException {
Reader in;
Writer out;
if (reader == null) {
String bcs = getBodyContent().getString().trim();
if (bcs == null || bcs.equals("")) {
throw new JspTagException("In <escapeHtml>, 'reader' " +
"not specified and no non-whitespace content inside the tag.");
}
in = castToReader(bcs);
} else {
in = reader;
}
if (writer == null) {
out = pageContext.getOut();
} else {
out = writer;
}
transform(in, out);
return EVAL_PAGE;
}
/** Releases any resources we may have (or inherit) */
public void release() {
super.release();
init();
}
//*********************************************************************
// Tag's scific behavior methods
/** Transform */
public void transform(Reader reader, Writer writer)
throws JspException {
int c;
try {
writer.write("<pre>");
while ((c = reader.read()) != -1) {
if (c == '<') {
writer.write("<");
} else if (c == '>') {
writer.write(">");
} else {
writer.write(c);
}
}
writer.write("</pre>");
} catch (IOException ex) {
throw new JspException("EscapeHtml: " +
"error copying chars", ex);
}
}
//*********************************************************************
// Utility methods
public static Reader castToReader(Object obj) throws JspException {
if (obj instanceof InputStream) {
return new InputStreamReader((InputStream) obj);
} else if (obj instanceof Reader) {
return (Reader) obj;
} else if (obj instanceof String) {
return new StringReader((String) obj);
}
throw new JspException("Invalid type '" + obj.getClass().getName() +
"' for castToReader()");
}
public static Writer castToWriter(Object obj) throws JspException {
if (obj instanceof OutputStream) {
return new OutputStreamWriter((OutputStream) obj);
} else if (obj instanceof Writer) {
return (Writer) obj;
/*@@@
} else if (obj instanceof String) {
return new StringWriter();
*/
}
throw new JspException("Invalid type '" + obj.getClass().getName() +
"' for castToWriter()");
}
}