/* Generated By:JJTree: Do not edit this line. AstIdentifier.java */
package org.jboss.el.parser;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.MethodNotFoundException;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import org.jboss.el.lang.EvaluationContext;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
*/
public final class AstIdentifier extends SimpleNode {
public AstIdentifier(int id) {
super(id);
}
public Class getType(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getType(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
return ctx.getELResolver().getType(ctx, null, this.image);
}
public Object getValue(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getValue(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
return ctx.getELResolver().getValue(ctx, null, this.image);
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.isReadOnly(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
return ctx.getELResolver().isReadOnly(ctx, null, this.image);
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
expr.setValue(ctx.getELContext(), value);
return;
}
}
ctx.setPropertyResolved(false);
ctx.getELResolver().setValue(ctx, null, this.image, value);
}
public Object invoke(EvaluationContext ctx, Class[] paramTypes,
Object[] paramValues) throws ELException {
return this.getMethodExpression(ctx).invoke(ctx.getELContext(),
paramValues);
}
public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes)
throws ELException {
return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext());
}
private final MethodExpression getMethodExpression(EvaluationContext ctx)
throws ELException {
Object obj = null;
// case A: ValueExpression exists, getValue which must
// be a MethodExpression
VariableMapper varMapper = ctx.getVariableMapper();
ValueExpression ve = null;
if (varMapper != null) {
ve = varMapper.resolveVariable(this.image);
if (ve != null) {
obj = ve.getValue(ctx);
}
}
// case B: evaluate the identity against the ELResolver, again, must be
// a MethodExpression to be able to invoke
if (ve == null) {
ctx.setPropertyResolved(false);
obj = ctx.getELResolver().getValue(ctx, null, this.image);
}
// finally provide helpful hints
if (obj instanceof MethodExpression) {
return (MethodExpression) obj;
} else if (obj == null) {
throw new MethodNotFoundException("Identity '" + this.image
+ "' was null and was unable to invoke");
} else {
throw new ELException(
"Identity '"
+ this.image
+ "' does not reference a MethodExpression instance, returned type: "
+ obj.getClass().getName());
}
}
}