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/*
* Copyright 2008-2019 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.plugin.core;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import org.springframework.util.Assert;
/**
* Basic implementation of {@link PluginRegistry}. Simply holds all given plugins in a list dropping {@literal null}
* values silently on adding.
*
* @author Oliver Gierke
*/
public class SimplePluginRegistry, S> extends PluginRegistrySupport {
/**
* Creates a new {@code SimplePluginRegistry}. Will create an empty registry if {@literal null} is provided.
*
* @param plugins must not be {@literal null}.
*/
protected SimplePluginRegistry(List plugins) {
super(plugins);
}
/**
* Creates a new {@link SimplePluginRegistry}.
*
* @return
*/
public static > SimplePluginRegistry empty() {
return of(Collections.emptyList());
}
/**
* Creates a new {@link SimplePluginRegistry} with the given {@link Plugin} s.
*
* @return
*/
@SafeVarargs
public static > SimplePluginRegistry of(T... plugins) {
return of(Arrays.asList(plugins));
}
/**
* Creates a new {@link SimplePluginRegistry} with the given {@link Plugin} s.
*
* @return
*/
public static > SimplePluginRegistry of(List plugins) {
return new SimplePluginRegistry<>(plugins);
}
/**
* Creates a new {@link SimplePluginRegistry}.
*
* @return
* @deprecated use {@link #empty()} instead.
*/
@Deprecated
public static > SimplePluginRegistry create() {
return of(Collections. emptyList());
}
/**
* Creates a new {@link SimplePluginRegistry} with the given {@link Plugin} s.
*
* @return
* @deprecated use {@link #of(List)} instead.
*/
@Deprecated
public static > SimplePluginRegistry create(List plugins) {
return new SimplePluginRegistry<>(plugins);
}
/* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistrySupport#getPlugins()
*/
@Override
public List getPlugins() {
return Collections.unmodifiableList(super.getPlugins());
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginFor(java.lang.Object)
*/
@Override
public Optional getPluginFor(S delimiter) {
Assert.notNull(delimiter, "Delimiter must not be null!");
return super.getPlugins().stream()//
.filter(it -> it.supports(delimiter))//
.findFirst();
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getRequiredPluginFor(java.lang.Object)
*/
@Override
public T getRequiredPluginFor(S delimiter) {
Assert.notNull(delimiter, "Delimiter must not be null!");
return getRequiredPluginFor(delimiter,
() -> String.format("No plugin found for delimiter %s! Registered plugins: %s.", delimiter, getPlugins()));
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getRequiredPluginFor(java.lang.Object, java.util.function.Supplier)
*/
@Override
public T getRequiredPluginFor(S delimiter, Supplier message) throws IllegalArgumentException {
Assert.notNull(delimiter, "Delimiter must not be null!");
Assert.notNull(message, "Message must not be null!");
return getPluginFor(delimiter, () -> new IllegalArgumentException(message.get()));
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginsFor(java.lang.Object)
*/
@Override
public List getPluginsFor(S delimiter) {
Assert.notNull(delimiter, "Delimiter must not be null!");
return super.getPlugins().stream()//
.filter(it -> it.supports(delimiter))//
.collect(Collectors.toList());
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginFor(java.lang.Object, org.springframework.plugin.core.PluginRegistry.Supplier)
*/
@Override
public T getPluginFor(S delimiter, Supplier ex) throws E {
Assert.notNull(delimiter, "Delimiter must not be null!");
Assert.notNull(ex, "Exception supplier must not be null!");
return getPluginFor(delimiter).orElseThrow(ex);
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginsFor(java.lang.Object, org.springframework.plugin.core.PluginRegistry.ExceptionProvider)
*/
@Override
public List getPluginsFor(S delimiter, Supplier ex) throws E {
Assert.notNull(delimiter, "Delimiter must not be null!");
Assert.notNull(ex, "Exception supplier must not be null!");
List result = getPluginsFor(delimiter);
if (result.isEmpty()) {
throw ex.get();
}
return result;
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginOrDefaultFor(java.lang.Object, org.springframework.plugin.core.Plugin)
*/
@Override
public T getPluginOrDefaultFor(S delimiter, T plugin) {
return getPluginOrDefaultFor(delimiter, () -> plugin);
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginOrDefaultFor(java.lang.Object, java.util.function.Supplier)
*/
@Override
public T getPluginOrDefaultFor(S delimiter, Supplier defaultSupplier) {
Assert.notNull(delimiter, "Delimiter must not be null!");
Assert.notNull(defaultSupplier, "Default supplier must not be null!");
return getPluginFor(delimiter).orElseGet(defaultSupplier);
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#getPluginsFor(java.lang.Object, java.util.List)
*/
@Override
public List getPluginsFor(S delimiter, List plugins) {
Assert.notNull(delimiter, "Delimiter must not be null!");
Assert.notNull(plugins, "Plugins must not be null!");
List candidates = getPluginsFor(delimiter);
return candidates.isEmpty() ? new ArrayList(plugins) : candidates;
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#countPlugins()
*/
@Override
public int countPlugins() {
return super.getPlugins().size();
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#contains(org.springframework.plugin.core.Plugin)
*/
@Override
public boolean contains(T plugin) {
return super.getPlugins().contains(plugin);
}
/*
* (non-Javadoc)
* @see org.springframework.plugin.core.PluginRegistry#hasPluginFor(java.lang.Object)
*/
@Override
public boolean hasPluginFor(S delimiter) {
return getPluginFor(delimiter).isPresent();
}
}
