public ArrayELResolver() 
{
        this.isReadOnly = false;
}

Creates a new read/write ArrayELResolver.

 public ArrayELResolver(boolean isReadOnly) 
{
        this.isReadOnly = isReadOnly;
}

Creates a new ArrayELResolver whose read-only status is determined by the given parameter.

Parameters:

isReadOnly - true if this resolver cannot modify arrays; false otherwise.

 public Class getCommonPropertyType(ELContext context,
    Object base) 
{
        if (base != null && base.getClass().isArray()) {
            return Integer.class;
        }
        return null;
}

If the base object is a Java language array, returns the most general type that this resolver accepts for the property argument. Otherwise, returns null.

Assuming the base is an array, this method will always return Integer.class. This is because arrays accept integers for their index.

 public Iterator getFeatureDescriptors(ELContext context,
    Object base) 
{
        return null;
}

Always returns null, since there is no reason to iterate through set set of all integers.

The #getCommonPropertyType method returns sufficient information about what properties this resolver accepts.

 public Class getType(ELContext context,
    Object base,
    Object property) 
{
        if (context == null) {
            throw new NullPointerException();
        }
        if (base != null && base.getClass().isArray()) {
            context.setPropertyResolved(true);
            int index = toInteger (property);
            if (index <  0 || index  >= Array.getLength(base)) {
                throw new PropertyNotFoundException();
            }
            return base.getClass().getComponentType();
        }
        return null;
}

If the base object is an array, returns the most general acceptable type for a value in this array.

If the base is a array, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller should ignore the return value.

Assuming the base is an array, this method will always return base.getClass().getComponentType(), which is the most general type of component that can be stored at any given index in the array.

 public Object getValue(ELContext context,
    Object base,
    Object property) 
{
        if (context == null) {
            throw new NullPointerException();
        }
        if (base != null && base.getClass().isArray()) {
            context.setPropertyResolved(true);
            int index = toInteger (property);
            if (index  >= 0 && index <  Array.getLength(base)) {
                return Array.get(base, index);
            }
        }
        return null;
}

If the base object is a Java language array, returns the value at the given index. The index is specified by the property argument, and coerced into an integer. If the coercion could not be performed, an IllegalArgumentException is thrown. If the index is out of bounds, null is returned.

If the base is a Java language array, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller should ignore the return value.

 public boolean isReadOnly(ELContext context,
    Object base,
    Object property) 
{
        if (context == null) {
            throw new NullPointerException();
        }
        if (base != null && base.getClass().isArray()) {
            context.setPropertyResolved(true);
            int index = toInteger (property);
            if (index <  0 || index  >= Array.getLength(base)) {
                throw new PropertyNotFoundException();
            }
        }
        return isReadOnly;
}

If the base object is a Java language array, returns whether a call to #setValue will always fail.

If the base is a Java language array, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller should ignore the return value.

If this resolver was constructed in read-only mode, this method will always return true. Otherwise, it returns false.

 public  void setValue(ELContext context,
    Object base,
    Object property,
    Object val) 
{
        if (context == null) {
            throw new NullPointerException();
        }
        if (base != null && base.getClass().isArray()) {
            context.setPropertyResolved(true);
            if (isReadOnly) {
                throw new PropertyNotWritableException();
            }
            Class< ? > type = base.getClass().getComponentType();
            if (val != null && ! type.isAssignableFrom(val.getClass())) {
                throw new ClassCastException();
            }
            int index = toInteger (property);
            if (index <  0 || index  >= Array.getLength(base)) {
                throw new PropertyNotFoundException();
            }
            Array.set(base, index, val);
        }
}

If the base object is a Java language array, attempts to set the value at the given index with the given value. The index is specified by the property argument, and coerced into an integer. If the coercion could not be performed, an IllegalArgumentException is thrown. If the index is out of bounds, a PropertyNotFoundException is thrown.

If the base is a Java language array, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller can safely assume no value was set.

If this resolver was constructed in read-only mode, this method will always throw PropertyNotWritableException.