juneau-doc/docs/Topics/06.juneau-config/02.EntryTypes/02.POJOs.html

<!--
/***************************************************************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *  
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 ***************************************************************************************************************************/
 -->

POJOs

<p>
	The following methods are provided for accessing POJO values:
</p>
<ul class='javatree'>
	<li class='jc'>{@link oaj.config.Config}
	<ul>
		<li class='jm'>{@link oaj.config.Config#getObject(String,Class) getObject(String,Class)}
		<li class='jm'>{@link oaj.config.Config#getObjectWithDefault(String,Object,Class) getObjectWithDefault(String,T,Class)}
	</ul>
</ul>
<p>
	In theory, any {@doc PojoCategories parsable} POJO type can be represented
	as a config value. 
	However in practice, we're typically talking about the following:
</p>
<ul>
	<li>Objects convertible from Strings.
	<li>Beans.
</ul>
<p>
	An example of an object convertible from a String was already shown in an example above.
	In that case, it was a URL which has a public constructor that takes in a String:
</p>
<p class='bpcode w800'>
	<cc># A POJO</cc>
	<ck>key4</ck> = <cv>http://bar</cv>
</p>
<p class='bpcode w800'>
	<jc>// Read values from section #1</jc>
	URL key4 = c.getObject(<js>"Section1/key4"</js>, URL.<jk>class</jk>);
</p>
<p>
	Beans are represented as {@doc juneau-marshall.JsonDetails.SimplifiedJson Simplified JSON} by default:
</p>
<p class='bpcode w800'>
	<jc>// Contact information</jc>
	<cs>[ContactInfo]</cs>
	<ck>address</ck> = 
		<cv>{
			street: '123 Main Street',
			city: 'Anywhere',
			state: 'NY',
			zip: 12345
		}</cv>
</p>
<p class='bpcode w800'>
	<jc>// Example bean</jc>
	<jk>public class</jk> Address {
		<jk>public</jk> String <jf>street</jf>, <jf>city</jf>;
		<jk>public</jk> StateEnum <jf>state</jf>;
		<jk>public int</jk> <jf>zip</jf>;
	}

	<jc>// Example usage</jc>
	Config c = Config.<jsm>create</jsm>(<js>"MyConfig.cfg"</js>).build();
	Address myAddress = c.getObject(<js>"ContactInfo/address"</js>, Address.<jk>class</jk>);
</p>
<p>
	The format for beans depends on the serializer and parser registered on the Config which 
	is defined in the builder via the following methods:
</p>
<ul class='javatree'>
	<li class='jc'>{@link oaj.config.ConfigBuilder}
	<ul>
		<li class='jm'>{@link oaj.config.ConfigBuilder#serializer(Class) serializer(Class)}
		<li class='jm'>{@link oaj.config.ConfigBuilder#serializer(WriterSerializer) serializer(WriterSerializer)}
		<li class='jm'>{@link oaj.config.ConfigBuilder#parser(Class) parser(Class)}
		<li class='jm'>{@link oaj.config.ConfigBuilder#parser(ReaderParser) parser(ReaderParser)}
	</ul>
</ul>
<p>
	The default parser can also be overridden on the following getters:
</p>
<ul class='javatree'>
	<li class='jc'>{@link oaj.config.Config}
	<ul>
		<li class='jm'>{@link oaj.config.Config#getObject(String,Parser,Class) getObject(String,Parser,Class)}
		<li class='jm'>{@link oaj.config.Config#getObjectWithDefault(String,Parser,Object,Class) getObjectWithDefault(String,T,Parser,Class)}
	</ul>
</ul>