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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.ELResolver;
import javax.el.MethodInfo;
import javax.el.PropertyNotFoundException;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.lang.ELSupport;
import com.sun.el.util.MessageFactory;
import com.sun.el.util.ReflectionUtil;
/**
* @author Jacob Hookom [jacob@hookom.net]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
*/
public final class AstValue extends SimpleNode {
protected static class Target {
protected Object base;
protected Object property;
}
public AstValue(int id) {
super(id);
}
public Class getType(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
Class ret = ctx.getELResolver().getType(ctx, t.base, t.property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, t.property);
}
return ret;
}
private final Target getTarget(EvaluationContext ctx) throws ELException {
// evaluate expr-a to value-a
Object base = this.children[0].getValue(ctx);
// if our base is null (we know there are more properites to evaluate)
if (base == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.base", this.children[0].getImage()));
}
// set up our start/end
Object property = null;
int propCount = this.jjtGetNumChildren() - 1;
int i = 1;
// evaluate any properties before our target
ELResolver resolver = ctx.getELResolver();
if (propCount > 1) {
while (base != null && i < propCount) {
property = this.children[i].getValue(ctx);
ctx.setPropertyResolved(false);
base = resolver.getValue(ctx, base, property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(base, property);
}
i++;
}
// if we are in this block, we have more properties to resolve,
// but our base was null
if (base == null || property == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.property", property));
}
}
property = this.children[i].getValue(ctx);
if (property == null) {
throw new PropertyNotFoundException(MessageFactory.get(
"error.unreachable.property", this.children[i]));
}
Target t = new Target();
t.base = base;
t.property = property;
return t;
}
public Object getValue(EvaluationContext ctx) throws ELException {
Object base = this.children[0].getValue(ctx);
int propCount = this.jjtGetNumChildren();
int i = 1;
Object property = null;
ELResolver resolver = ctx.getELResolver();
while (base != null && i < propCount) {
property = this.children[i].getValue(ctx);
if (property == null) {
return null;
} else {
ctx.setPropertyResolved(false);
base = resolver.getValue(ctx, base, property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(base, property);
}
}
i++;
}
return base;
}
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
boolean ret = ctx.getELResolver().isReadOnly(ctx, t.base, t.property);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, t.property);
}
return ret;
}
public void setValue(EvaluationContext ctx, Object value)
throws ELException {
Target t = getTarget(ctx);
ctx.setPropertyResolved(false);
ELResolver elResolver = ctx.getELResolver();
if (value != null) {
value = ELSupport.coerceToType(value,
elResolver.getType(ctx, t.base, t.property));
}
elResolver.setValue(ctx, t.base, t.property, value);
if (! ctx.isPropertyResolved()) {
ELSupport.throwUnhandled(t.base, t.property);
}
}
public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes)
throws ELException {
Target t = getTarget(ctx);
Method m = ReflectionUtil.getMethod(t.base, t.property, paramTypes);
return new MethodInfo(m.getName(), m.getReturnType(), m
.getParameterTypes());
}
public Object invoke(EvaluationContext ctx, Class[] paramTypes,
Object[] paramValues) throws ELException {
Target t = getTarget(ctx);
Method m = ReflectionUtil.getMethod(t.base, t.property, paramTypes);
Object result = null;
try {
result = m.invoke(t.base, (Object[]) paramValues);
} catch (IllegalAccessException iae) {
throw new ELException(iae);
} catch (InvocationTargetException ite) {
throw new ELException(ite.getCause());
}
return result;
}
}
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