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  * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package freemarker.template;
Experimental - subject to change: "extended collection" template language data type: Adds size/emptiness querybility and "contains" test to TemplateCollectionModel. The added extra operations is provided by all Java java.util.Collection-s, and this interface was added to make that accessible for templates too.

Experimental status warning: This interface is subject to change on non-backward compatible ways, hence, it shouldn't be implemented outside FreeMarker yet.

public interface TemplateCollectionModelEx extends TemplateCollectionModel {

Returns the number items in this collection, or java.lang.Integer.MAX_VALUE, if there are more than java.lang.Integer.MAX_VALUE items.
    int size() throws TemplateModelException;

Returns if the collection contains any elements. This differs from size() != 0 only in that the exact number of items need not be calculated.
    boolean isEmpty() throws TemplateModelException;

Tells if a given value occurs in the collection, accodring the rules of the wrapped collection. As of 2.3.22, this interface is not yet utilized by FTL, and certainly it won't be earlier than 2.4.0. The usefulness of this method is questionable, as the equality rules of Java differs from that of FTL, hence, calling this won't be equivalent with ?seq_contains(e).
    boolean contains(TemplateModel itemthrows TemplateModelException;
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