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package org.apache.taglibs.standard.tag.common.xml;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* Tag handler for <expr> in JSTL's XML library.
*
* @author Shawn Bayern
*/
public abstract class ExprSupport extends TagSupport {
//*********************************************************************
// Internal state
private String select; // tag attribute
protected boolean escapeXml; // tag attribute
//*********************************************************************
// Construction and initialization
/**
* Constructs a new handler. As with TagSupport, subclasses should
* not provide other constructors and are expected to call the
* superclass constructor.
*/
public ExprSupport() {
super();
init();
}
// resets local state
private void init() {
select = null;
escapeXml = true;
}
//*********************************************************************
// Tag logic
// applies XPath expression from 'select' and prints the result
public int doStartTag() throws JspException {
try {
XPathUtil xu = new XPathUtil(pageContext);
String result = xu.valueOf(XPathUtil.getContext(this), select);
org.apache.taglibs.standard.tag.common.core.OutSupport.out(
pageContext, escapeXml, result);
return SKIP_BODY;
} catch (java.io.IOException ex) {
throw new JspTagException(ex.toString(), ex);
}
}
// Releases any resources we may have (or inherit)
public void release() {
super.release();
init();
}
//*********************************************************************
// Attribute accessors
public void setSelect(String select) {
this.select = select;
}
}