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package com.sun.faces.el;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.NoSuchElementException;
import javax.el.ELResolver;
import javax.el.ELContext;
import javax.el.ELException;
/**
* Maintains an ordered composite list of child ELResolver for JSF.
*
*/
public class DemuxCompositeELResolver extends FacesCompositeELResolver
{
private final ELResolverChainType _chainType;
private ELResolver[] _rootELResolvers = new ELResolver[2];
private ELResolver[] _propertyELResolvers = new ELResolver[2];
private ELResolver[] _allELResolvers = new ELResolver[2];
private int _rootELResolverCount = 0;
private int _propertyELResolverCount = 0;
private int _allELResolverCount = 0;
public DemuxCompositeELResolver(ELResolverChainType chainType)
{
if (chainType == null)
throw new NullPointerException();
_chainType = chainType;
}
public ELResolverChainType getChainType()
{
return _chainType;
}
private void _addAllELResolver(ELResolver elResolver)
{
if (elResolver == null)
throw new NullPointerException();
// grow array, if necessary
if (_allELResolverCount == _allELResolvers.length)
{
ELResolver[] biggerResolvers = new ELResolver[_allELResolverCount * 2];
System.arraycopy(_allELResolvers, 0, biggerResolvers, 0, _allELResolverCount);
_allELResolvers = biggerResolvers;
}
// assign new resolver to end
_allELResolvers[_allELResolverCount] = elResolver;
_allELResolverCount++;
}
private void _addRootELResolver(ELResolver elResolver)
{
if (elResolver == null)
throw new NullPointerException();
// grow array, if necessary
if (_rootELResolverCount == _rootELResolvers.length)
{
ELResolver[] biggerResolvers = new ELResolver[_rootELResolverCount * 2];
System.arraycopy(_rootELResolvers, 0, biggerResolvers, 0, _rootELResolverCount);
_rootELResolvers = biggerResolvers;
}
// assign new resolver to end
_rootELResolvers[_rootELResolverCount] = elResolver;
_rootELResolverCount++;
}
public void _addPropertyELResolver(ELResolver elResolver)
{
if (elResolver == null)
throw new NullPointerException();
// grow array, if necessary
if (_propertyELResolverCount == _propertyELResolvers.length)
{
ELResolver[] biggerResolvers = new ELResolver[_propertyELResolverCount * 2];
System.arraycopy(_propertyELResolvers, 0, biggerResolvers, 0, _propertyELResolverCount);
_propertyELResolvers = biggerResolvers;
}
// assign new resolver to end
_propertyELResolvers[_propertyELResolverCount] = elResolver;
_propertyELResolverCount++;
}
public void addRootELResolver(ELResolver elResolver)
{
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addRootELResolver(elResolver);
_addAllELResolver(elResolver);
}
public void addPropertyELResolver(ELResolver elResolver)
{
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addPropertyELResolver(elResolver);
_addAllELResolver(elResolver);
}
public void add(ELResolver elResolver)
{
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addRootELResolver(elResolver);
_addPropertyELResolver(elResolver);
_addAllELResolver(elResolver);
}
private Object _getValue(
int resolverCount,
ELResolver[] resolvers,
ELContext context,
Object base,
Object property) throws ELException
{
for (int i = 0; i < resolverCount; i++)
{
Object result = resolvers[i].getValue(context, base, property);
if (context.isPropertyResolved())
return result;
}
return null;
}
public Object getValue(ELContext context, Object base, Object property) throws ELException
{
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null)
{
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
}
else
{
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _getValue(resolverCount, resolvers, context, base, property);
}
private Class _getType(
int resolverCount,
ELResolver[] resolvers,
ELContext context,
Object base,
Object property) throws ELException
{
for (int i = 0; i < resolverCount; i++)
{
Class type = resolvers[i].getType(context, base, property);
if (context.isPropertyResolved())
return type;
}
return null;
}
public Class getType(ELContext context, Object base, Object property) throws ELException
{
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null)
{
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
}
else
{
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _getType(resolverCount, resolvers, context, base, property);
}
private void _setValue(
int resolverCount,
ELResolver[] resolvers,
ELContext context,
Object base,
Object property,
Object val) throws ELException
{
for (int i = 0; i < resolverCount; i++)
{
resolvers[i].setValue(context, base, property, val);
if (context.isPropertyResolved())
return;
}
}
public void setValue(ELContext context, Object base, Object property, Object val)
throws ELException
{
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null)
{
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
}
else
{
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
_setValue(resolverCount, resolvers, context, base, property, val);
}
private boolean _isReadOnly(
int resolverCount,
ELResolver[] resolvers,
ELContext context,
Object base,
Object property) throws ELException
{
for (int i = 0; i < resolverCount; i++)
{
boolean isReadOnly = resolvers[i].isReadOnly(context, base, property);
if (context.isPropertyResolved())
return isReadOnly;
}
return false;
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property)
throws ELException
{
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null)
{
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
}
else
{
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _isReadOnly(resolverCount, resolvers, context, base, property);
}
public Iterator getFeatureDescriptors(ELContext context, Object base)
{
return new DescriptorIterator(context, base, _allELResolvers, _allELResolverCount);
}
private final static class DescriptorIterator implements Iterator
{
// snapshot the ELResolver array to avoid using a non-static inner class that needs to
// make function calls
public DescriptorIterator(
ELContext context,
Object base,
ELResolver[] resolvers,
int resolverCount)
{
_context = context;
_base = base;
_resolvers = resolvers;
_resolverCount = resolverCount;
}
public boolean hasNext()
{
do
{
// A null return does *not* mean hasNext() should return false.
Iterator currIterator = _getCurrIterator();
if (null != currIterator) {
if (currIterator.hasNext()) {
return true;
} else {
_currIterator = null;
_currResolverIndex++;
}
} else {
if (_currResolverIndex < _resolverCount) {
continue;
} else {
return false;
}
}
} while (true);
}
private Iterator _getCurrIterator()
{
Iterator currIterator = _currIterator;
if (currIterator == null)
{
if (_currResolverIndex < _resolverCount)
{
currIterator = _resolvers[_currResolverIndex].getFeatureDescriptors(_context, _base);
_currResolverIndex++;
_currIterator = currIterator;
}
}
return currIterator;
}
public FeatureDescriptor next()
{
if (hasNext())
return _getCurrIterator().next();
else
throw new NoSuchElementException();
}
public void remove()
{
throw new UnsupportedOperationException();
}
private final ELContext _context;
private final Object _base;
private final ELResolver[] _resolvers;
private final int _resolverCount;
private int _currResolverIndex;
private Iterator _currIterator;
}
public Class getCommonPropertyType(ELContext context, Object base)
{
return null;
}
}
