com.sun.el.parser.AstFunction Maven / Gradle / Ivy
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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 javax.el.LambdaExpression;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import javax.el.ELClass;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.util.MessageFactory;
/**
* @author Jacob Hookom [[email protected]]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
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.length() == 0) {
return this.localName;
} else {
return this.prefix + ":" + this.localName;
}
}
public String getPrefix() {
return prefix;
}
@Override
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();
}
/*
* Find the object associated with the given name. Return null if the
* there is no such object.
*/
private Object findValue(EvaluationContext ctx, String name) {
Object value;
// First check if this is a Lambda argument
if (ctx.isLambdaArgument(name)) {
return ctx.getLambdaArgument(name);
}
// Next check if this an EL variable
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(name);
if (expr != null) {
return expr.getValue(ctx.getELContext());
}
}
// Check if this is resolvable by an ELResolver
ctx.setPropertyResolved(false);
Object ret = ctx.getELResolver().getValue(ctx, null, name);
if (ctx.isPropertyResolved()) {
return ret;
}
return null;
}
@Override
public Object getValue(EvaluationContext ctx)
throws ELException {
// Check to see if a function is a bean that is a Lambdaexpression.
// If so, invoke it. Also allow for the case that a Lambda expression
// can return another Lambda expression.
if (prefix.length() == 0) {
Object val = findValue(ctx, this.localName);
// Check the case of repeated lambda invocation, such as f()()()
if ((val != null) && (val instanceof LambdaExpression)) {
for (int i = 0; i < this.children.length; i++) {
Object[] params = ((AstMethodArguments)this.children[i]).
getParameters(ctx);
if (! (val instanceof LambdaExpression)) {
throw new ELException(MessageFactory.get(
"error.function.syntax", getOutputName()));
}
val = ((LambdaExpression)val).invoke(ctx, params);
}
return val;
}
}
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) {
if (this.prefix.length() == 0 && ctx.getImportHandler() != null) {
Class c = null;;
// Check if this is a constructor call for an imported class
c = ctx.getImportHandler().resolveClass(this.localName);
String methodName = null;
if (c != null) {
methodName = "";
} else {
// Check if this is a imported static method
c = ctx.getImportHandler().resolveStatic(this.localName);
methodName = this.localName;;
}
if (c != null) {
// Use StaticFieldELResolver to invoke the constructor or the
// static method.
Object[] params =
((AstMethodArguments)this.children[0]).getParameters(ctx);
return ctx.getELResolver().invoke(ctx, new ELClass(c),
methodName, null, params);
}
}
throw new ELException(MessageFactory.get("error.fnMapper.method",
this.getOutputName()));
}
Class[] paramTypes = m.getParameterTypes();
Object[] params =
((AstMethodArguments)this.children[0]).getParameters(ctx);
Object result = null;
for (int i = 0; i < params.length; i++) {
try {
params[i] = ctx.convertToType(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;
}
@Override
public String toString()
{
return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
}
}
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