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package com.sun.el.parser;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.el.ELException;
import javax.el.FunctionMapper;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.util.MessageFactory;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
*/
public final class AstFunction extends SimpleNode {
protected String localName = "";
protected String prefix = "";
public AstFunction(int id) {
super(id);
}
public String getLocalName() {
return localName;
}
public String getOutputName() {
if (this.prefix == null) {
return this.localName;
} else {
return this.prefix + ":" + this.localName;
}
}
public String getPrefix() {
return prefix;
}
public Class getType(EvaluationContext ctx)
throws ELException {
FunctionMapper fnMapper = ctx.getFunctionMapper();
// quickly validate again for this request
if (fnMapper == null) {
throw new ELException(MessageFactory.get("error.fnMapper.null"));
}
Method m = fnMapper.resolveFunction(this.prefix, this.localName);
if (m == null) {
throw new ELException(MessageFactory.get("error.fnMapper.method",
this.getOutputName()));
}
return m.getReturnType();
}
public Object getValue(EvaluationContext ctx)
throws ELException {
FunctionMapper fnMapper = ctx.getFunctionMapper();
// quickly validate again for this request
if (fnMapper == null) {
throw new ELException(MessageFactory.get("error.fnMapper.null"));
}
Method m = fnMapper.resolveFunction(this.prefix, this.localName);
if (m == null) {
throw new ELException(MessageFactory.get("error.fnMapper.method",
this.getOutputName()));
}
Class[] paramTypes = m.getParameterTypes();
Object[] params = null;
Object result = null;
int numParams = this.jjtGetNumChildren();
if (numParams > 0) {
params = new Object[numParams];
try {
for (int i = 0; i < numParams; i++) {
params[i] = this.children[i].getValue(ctx);
params[i] = coerceToType(params[i], paramTypes[i]);
}
} catch (ELException ele) {
throw new ELException(MessageFactory.get("error.function", this
.getOutputName()), ele);
}
}
try {
result = m.invoke(null, params);
} catch (IllegalAccessException iae) {
throw new ELException(MessageFactory.get("error.function", this
.getOutputName()), iae);
} catch (InvocationTargetException ite) {
throw new ELException(MessageFactory.get("error.function", this
.getOutputName()), ite.getCause());
}
return result;
}
public void setLocalName(String localName) {
this.localName = localName;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public String toString()
{
return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
}
}