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package javax.faces.validator;
import java.beans.
FeatureDescriptor;
import java.util.
Iterator;
import java.util.
Locale;
import javax.el.
ELContext;
import javax.el.
ELException;
import javax.el.
ELResolver;
import javax.el.
FunctionMapper;
import javax.el.
ValueExpression;
import javax.el.
VariableMapper;
import javax.faces.el.
CompositeComponentExpressionHolder;
/**
* Analyzes a {@link ValueExpression} and provides access to the base object and property
* name to which the expression maps via the getReference() method.
*/
class
ValueExpressionAnalyzer {
private
ValueExpression expression;
public
ValueExpressionAnalyzer(
ValueExpression expression) {
this.
expression =
expression;
}
public
ValueReference getReference(
ELContext elContext) {
InterceptingResolver resolver = new
InterceptingResolver(
elContext.
getELResolver());
try {
expression.
setValue(
decorateELContext(
elContext,
resolver), null);
} catch (
ELException ele) {
return null;
}
ValueReference reference =
resolver.
getValueReference();
if (
reference != null) {
Object base =
reference.
getBase();
if (
base instanceof
CompositeComponentExpressionHolder) {
ValueExpression ve = ((
CompositeComponentExpressionHolder)
base).
getExpression(
reference.
getProperty());
if (
ve != null) {
this.
expression =
ve;
reference =
getReference(
elContext);
}
}
}
return
reference;
}
private
ELContext decorateELContext(final
ELContext context, final
ELResolver resolver) {
return new
ELContext() {
// punch in our new ELResolver
@
Override
public
ELResolver getELResolver() {
return
resolver;
}
// The rest of the methods simply delegate to the existing context
@
Override
public
Object getContext(
Class key) {
return
context.
getContext(
key);
}
@
Override
public
Locale getLocale() {
return
context.
getLocale();
}
@
Override
public boolean
isPropertyResolved() {
return
context.
isPropertyResolved();
}
@
Override
public void
putContext(
Class key,
Object contextObject) {
context.
putContext(
key,
contextObject);
}
@
Override
public void
setLocale(
Locale locale) {
context.
setLocale(
locale);
}
@
Override
public void
setPropertyResolved(boolean
resolved) {
context.
setPropertyResolved(
resolved);
}
@
Override
public
FunctionMapper getFunctionMapper() {
return
context.
getFunctionMapper();
}
@
Override
public
VariableMapper getVariableMapper() {
return
context.
getVariableMapper();
}
};
}
private static class
InterceptingResolver extends
ELResolver {
private
ELResolver delegate;
private
ValueReference valueReference;
public
InterceptingResolver(
ELResolver delegate) {
this.
delegate =
delegate;
}
public
ValueReference getValueReference() {
return
valueReference;
}
// Capture the base and property rather than write the value
@
Override
public void
setValue(
ELContext context,
Object base,
Object property,
Object value) {
if (
base != null &&
property != null) {
context.
setPropertyResolved(true);
valueReference = new
ValueReference(
base,
property.
toString());
}
}
// The rest of the methods simply delegate to the existing context
@
Override
public
Object getValue(
ELContext context,
Object base,
Object property) {
return
delegate.
getValue(
context,
base,
property);
}
@
Override
public
Class<?>
getType(
ELContext context,
Object base,
Object property) {
return
delegate.
getType(
context,
base,
property);
}
@
Override
public boolean
isReadOnly(
ELContext context,
Object base,
Object property) {
return
delegate.
isReadOnly(
context,
base,
property);
}
@
Override
public
Iterator<
FeatureDescriptor>
getFeatureDescriptors(
ELContext context,
Object base) {
return
delegate.
getFeatureDescriptors(
context,
base);
}
@
Override
public
Class<?>
getCommonPropertyType(
ELContext context,
Object base) {
return
delegate.
getCommonPropertyType(
context,
base);
}
}
}