/*
* 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.sshd.common.kex;
import java.util.Collections;
import java.util.List;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.cipher.Cipher;
import org.apache.sshd.common.compression.Compression;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.mac.Mac;
import org.apache.sshd.common.signature.Signature;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.closeable.AbstractInnerCloseable;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public abstract class AbstractKexFactoryManager
extends AbstractInnerCloseable
implements KexFactoryManager {
private KexFactoryManager parent;
private List<NamedFactory<KeyExchange>> keyExchangeFactories;
private List<NamedFactory<Cipher>> cipherFactories;
private List<NamedFactory<Compression>> compressionFactories;
private List<NamedFactory<Mac>> macFactories;
private List<NamedFactory<Signature>> signatureFactories;
private KeyPairProvider keyPairProvider;
protected AbstractKexFactoryManager() {
this(null);
}
protected AbstractKexFactoryManager(KexFactoryManager parent) {
this.parent = parent;
}
@Override
public List<NamedFactory<KeyExchange>> getKeyExchangeFactories() {
return resolveEffectiveFactories(KeyExchange.class, keyExchangeFactories,
(parent == null) ? Collections.emptyList() : parent.getKeyExchangeFactories());
}
@Override
public void setKeyExchangeFactories(List<NamedFactory<KeyExchange>> keyExchangeFactories) {
this.keyExchangeFactories = keyExchangeFactories;
}
@Override
public List<NamedFactory<Cipher>> getCipherFactories() {
return resolveEffectiveFactories(Cipher.class, cipherFactories,
(parent == null) ? Collections.emptyList() : parent.getCipherFactories());
}
@Override
public void setCipherFactories(List<NamedFactory<Cipher>> cipherFactories) {
this.cipherFactories = cipherFactories;
}
@Override
public List<NamedFactory<Compression>> getCompressionFactories() {
return resolveEffectiveFactories(Compression.class, compressionFactories,
(parent == null) ? Collections.emptyList() : parent.getCompressionFactories());
}
@Override
public void setCompressionFactories(List<NamedFactory<Compression>> compressionFactories) {
this.compressionFactories = compressionFactories;
}
@Override
public List<NamedFactory<Mac>> getMacFactories() {
return resolveEffectiveFactories(Mac.class, macFactories,
(parent == null) ? Collections.emptyList() : parent.getMacFactories());
}
@Override
public void setMacFactories(List<NamedFactory<Mac>> macFactories) {
this.macFactories = macFactories;
}
@Override
public List<NamedFactory<Signature>> getSignatureFactories() {
return resolveEffectiveFactories(Signature.class, signatureFactories,
(parent == null) ? Collections.emptyList() : parent.getSignatureFactories());
}
@Override
public void setSignatureFactories(List<NamedFactory<Signature>> signatureFactories) {
this.signatureFactories = signatureFactories;
}
@Override
public KeyPairProvider getKeyPairProvider() {
return resolveEffectiveProvider(KeyPairProvider.class, keyPairProvider,
(parent == null) ? null : parent.getKeyPairProvider());
}
@Override
public void setKeyPairProvider(KeyPairProvider keyPairProvider) {
this.keyPairProvider = keyPairProvider;
}
protected <V> List<NamedFactory<V>> resolveEffectiveFactories(Class<V> factoryType, List<NamedFactory<V>> local, List<NamedFactory<V>> inherited) {
if (GenericUtils.isEmpty(local)) {
return inherited;
} else {
return local;
}
}
protected <V> V resolveEffectiveProvider(Class<V> providerType, V local, V inherited) {
if (local == null) {
return inherited;
} else {
return local;
}
}
}