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/*
 * [The "BSD license"]
 *  Copyright (c) 2011 Terence Parr
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.stringtemplate.v4.misc;

import java.util.HashMap;

/** An automatically created aggregate of properties.
 *
 *  

I often have lists of things that need to be formatted, but the list * items are actually pieces of data that are not already in an object. I * need ST to do something like:

*

* Ter=3432
* Tom=32234
* ....

*

* using template:

*

* {@code $items:{it.name$=$it.type$}$}

*

* This example will call {@code getName()} on the objects in items attribute, but * what if they aren't objects? I have perhaps two parallel arrays * instead of a single array of objects containing two fields. One * solution is allow {@code Map}s to be handled like properties so that {@code it.name} * would fail {@code getName()} but then see that it's a {@code Map} and do * {@code it.get("name")} instead.

*

* This very clean approach is espoused by some, but the problem is that * it's a hole in my separation rules. People can put the logic in the * view because you could say: "go get bob's data" in the view:

*

* Bob's Phone: {@code $db.bob.phone$}

*

* A view should not be part of the program and hence should never be able * to go ask for a specific person's data.

*

* After much thought, I finally decided on a simple solution. I've * added setAttribute variants that pass in multiple property values, * with the property names specified as part of the name using a special * attribute name syntax: {@code "name.{propName1,propName2,...}"}. This * object is a special kind of {@code HashMap} that hopefully prevents people * from passing a subclass or other variant that they have created as * it would be a loophole. Anyway, the {@link AggregateModelAdaptor#getProperty} * method looks for {@code Aggregate} as a special case and does a {@link #get} instead * of {@code getPropertyName}.

*/ public class Aggregate { public HashMap properties = new HashMap(); /** Allow StringTemplate to add values, but prevent the end * user from doing so. */ protected void put(String propName, Object propValue) { properties.put(propName, propValue); } public Object get(String propName) { return properties.get(propName); } @Override public String toString() { return properties.toString(); } }




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