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package com.sun.el.parser;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.MethodNotFoundException;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import javax.el.ValueReference;
import javax.el.PropertyNotWritableException;
import javax.el.ELClass;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.lang.ELSupport;
import com.sun.el.util.MessageFactory;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @author Kin-man Chung
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
public final class AstIdentifier extends SimpleNode {
public AstIdentifier(int id) {
super(id);
}
@Override
public Class getType(EvaluationContext ctx) throws ELException {
// First check if this is a lambda argument
if (ctx.isLambdaArgument(this.image)) {
return Object.class;
}
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getType(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
Class ret = ctx.getELResolver().getType(ctx, null, this.image);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(null, this.image);
}
return ret;
}
public ValueReference getValueReference(EvaluationContext ctx)
throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getValueReference(ctx.getELContext());
}
}
return new ValueReference(null, this.image);
}
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
// First check if this is a lambda argument
if (ctx.isLambdaArgument(this.image)) {
return ctx.getLambdaArgument(this.image);
}
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.getValue(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
Object ret = ctx.getELResolver().getValue(ctx, null, this.image);
if (! ctx.isPropertyResolved()) {
// Check if this is an imported static field
if (ctx.getImportHandler() != null) {
Class<?> c = ctx.getImportHandler().resolveStatic(this.image);
if (c != null) {
return ctx.getELResolver().getValue(ctx, new ELClass(c),
this.image);
}
}
ELSupport.throwUnhandled(null, this.image);
}
return ret;
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
// Lambda arguments are read only.
if (ctx.isLambdaArgument(this.image)) {
return true;
}
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.isReadOnly(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
boolean ret = ctx.getELResolver().isReadOnly(ctx, null, this.image);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(null, this.image);
}
return ret;
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
// First check if this is a lambda argument
if (ctx.isLambdaArgument(this.image)) {
throw new PropertyNotWritableException(
MessageFactory.get("error.lambda.parameter.readonly",
this.image));
}
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);
ELResolver elResolver = ctx.getELResolver();
elResolver.setValue(ctx, null, this.image, value);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(null, this.image);
}
}
private final Object invokeTarget(EvaluationContext ctx, Object target,
Object[] paramValues) throws ELException {
if (target instanceof MethodExpression) {
MethodExpression me = (MethodExpression) target;
return me.invoke(ctx.getELContext(), paramValues);
} else if (target == 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: "
+ target.getClass().getName());
}
}
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());
}
}
}