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/*
* 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.
*/
package org.apache.commons.configuration2.builder.combined;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.stream.Stream;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.beanutils.DynaProperty;
/**
* <p>
* An implementation of {@code DynaClass} which combines the properties of multiple other {@code DynaClass} instances.
* </p>
*
* @since 2.0
*/
final class MultiWrapDynaClass implements DynaClass {
/** An empty array for converting the properties collection to an array. */
private static final DynaProperty[] EMPTY_PROPS = {};
/** A collection with all properties of this class. */
private final Collection<DynaProperty> properties;
/** A map for accessing properties by name. */
private final Map<String, DynaProperty> namedProperties;
/**
* Creates a new instance of {@code MultiWrapDynaClass} and initializes it with the collection of classes to be wrapped.
*
* @param wrappedCls the collection with wrapped classes
*/
public MultiWrapDynaClass(final Collection<? extends DynaClass> wrappedCls) {
properties = new LinkedList<>();
namedProperties = new HashMap<>();
initProperties(wrappedCls);
}
@Override
public DynaProperty[] getDynaProperties() {
return properties.toArray(EMPTY_PROPS);
}
@Override
public DynaProperty getDynaProperty(final String name) {
return namedProperties.get(name);
}
/**
* {@inheritDoc} The name of this class is not relevant.
*/
@Override
public String getName() {
return null;
}
/**
* Initializes the members related to the properties of the wrapped classes.
*
* @param wrappedCls the collection with the wrapped classes
*/
private void initProperties(final Collection<? extends DynaClass> wrappedCls) {
wrappedCls.forEach(cls -> Stream.of(cls.getDynaProperties()).forEach(p -> {
properties.add(p);
namedProperties.put(p.getName(), p);
}));
}
/**
* {@inheritDoc} This implementation always throws an exception because it is not possible to instantiate a bean of
* multiple classes.
*/
@Override
public DynaBean newInstance() throws IllegalAccessException, InstantiationException {
throw new UnsupportedOperationException("Cannot create an instance of MultiWrapDynaBean!");
}
}