org.apache.taglibs.standard.tag.el.xml.TransformTag Maven / Gradle / Ivy
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package org.apache.taglibs.standard.tag.el.xml;
import javax.servlet.jsp.JspException;
import javax.xml.transform.Result;
import org.apache.taglibs.standard.tag.common.xml.TransformSupport;
import org.apache.taglibs.standard.tag.el.core.ExpressionUtil;
/**
* A handler for <transform> that accepts attributes as Strings
* and evaluates them as expressions at runtime.
*
* @author Shawn Bayern
*/
public class TransformTag extends TransformSupport {
//*********************************************************************
// 'Private' state (implementation details)
private String xml_; // stores EL-based property
private String xmlSystemId_; // stores EL-based property
private String xslt_; // stores EL-based property
private String xsltSystemId_; // stores EL-based property
private String result_; // stores EL-based property
//*********************************************************************
// Constructor
public TransformTag() {
super();
init();
}
//*********************************************************************
// Tag logic
// evaluates expression and chains to parent
public int doStartTag() throws JspException {
// evaluate any expressions we were passed, once per invocation
evaluateExpressions();
// chain to the parent implementation
return super.doStartTag();
}
// Releases any resources we may have (or inherit)
public void release() {
super.release();
init();
}
//*********************************************************************
// Accessor methods
// for EL-based attribute
public void setXml(String xml_) {
this.xml_ = xml_;
}
// for EL-based attribute
public void setXmlSystemId(String xmlSystemId_) {
this.xmlSystemId_ = xmlSystemId_;
}
// for EL-based attribute
public void setXslt(String xslt_) {
this.xslt_ = xslt_;
}
// for EL-based attribute
public void setXsltSystemId(String xsltSystemId_) {
this.xsltSystemId_ = xsltSystemId_;
}
/* Removed for RI 0.5
// for EL-based attribute
public void setTransformer(String transformer_) {
this.transformer_ = transformer_;
}
*/
// for EL-based attribute
public void setResult(String result_) {
this.result_ = result_;
}
//*********************************************************************
// Private (utility) methods
// (re)initializes state (during release() or construction)
private void init() {
// null implies "no expression"
xml_ = xmlSystemId = xslt_ = xsltSystemId_ = result_ = null;
}
/* Evaluates expressions as necessary */
private void evaluateExpressions() throws JspException {
/*
* Note: we don't check for type mismatches here; we assume
* the expression evaluator will return the expected type
* (by virtue of knowledge we give it about what that type is).
* A ClassCastException here is truly unexpected, so we let it
* propagate up.
*/
xml = ExpressionUtil.evalNotNull(
"transform", "xml", xml_, Object.class, this, pageContext);
xmlSystemId = (String) ExpressionUtil.evalNotNull(
"transform", "xmlSystemId", xmlSystemId_, String.class,
this, pageContext);
xslt= ExpressionUtil.evalNotNull(
"transform", "xslt", xslt_, Object.class, this,
pageContext);
xsltSystemId = (String) ExpressionUtil.evalNotNull(
"transform", "xsltSystemId", xsltSystemId_, String.class,
this, pageContext);
result = (Result) ExpressionUtil.evalNotNull(
"transform", "result", result_, Result.class, this, pageContext);
}
}