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TypeConverter.java
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.el;
import java.util.Iterator;
import java.beans.FeatureDescriptor;
/**
* A convenient class for writing an ELResolver to do custom type conversions.
*
* <p>For example, to convert a String to an instance of MyDate, one can write
* <blockquote><pre>
* ELProcessor elp = new ELProcessor();
* elp.getELManager().addELResolver(new TypeConverter() {
* Object convertToType(ELContext context, Object obj, Class<?> type) {
* if ((obj instanceof String) && type == MyDate.class) {
* context.setPropertyResolved(obj, type);
* return (obj == null)? null: new MyDate(obj.toString());
* }
* return null;
* }
* };
* </pre></blockquote>
*
* @since EL 3.0
*/
public abstract class TypeConverter extends ELResolver {
@Override
public Object getValue(ELContext context,
Object base,
Object property) {
return null;
}
@Override
public Class<?> getType(ELContext context,
Object base,
Object property) {
return null;
}
@Override
public void setValue(ELContext context,
Object base,
Object property,
Object value) {
}
@Override
public boolean isReadOnly(ELContext context,
Object base,
Object property){
return false;
}
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(
ELContext context,
Object base) {
return null;
}
@Override
public Class<?> getCommonPropertyType(ELContext context,
Object base) {
return null;
}
/**
* Converts an object to a specific type.
*
* <p>An <code>ELException</code> is thrown if an error occurs during
* the conversion.</p>
*
* @param context The context of this evaluation.
* @param obj The object to convert.
* @param targetType The target type for the conversion.
* @throws ELException thrown if errors occur.
*/
@Override
abstract public Object convertToType(ELContext context,
Object obj,
Class<?> targetType);
}