com.github.lothar.security.acl.SimpleAclStrategy.java Source code

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Here is the source code for com.github.lothar.security.acl.SimpleAclStrategy.java

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/*******************************************************************************
 * Copyright 2002-2016 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
 *
 *      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 com.github.lothar.security.acl;

import static org.springframework.util.Assert.notNull;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.lothar.security.acl.named.NamedBean;

@SuppressWarnings("unchecked")
public class SimpleAclStrategy extends NamedBean implements AclStrategy {

    private Logger logger = LoggerFactory.getLogger(getClass());
    private Map<AclFeature<?>, Object> handlersByFeature = new HashMap<>();

    public <Handler> void install(AclFeature<Handler> feature, Handler handler) {
        notNull(feature, "Feature can't be null");
        notNull(handler,
                "Can't register a null handler ; please use unregister(" + AclFeature.class.getSimpleName() + ")");
        handlersByFeature.put(feature, handler);
        if (logger.isDebugEnabled()) {
            logger.debug("Installed {} handler in {} : {}", feature, name(), handler);
        }
    }

    public <Handler> Handler uninstall(AclFeature<Handler> feature) {
        Handler filter = (Handler) handlersByFeature.remove(feature);
        if (logger.isDebugEnabled()) {
            logger.debug("Uninstalled {} handler from {}", feature, name());
        }
        return filter;
    }

    public <Handler> Handler handlerFor(AclFeature<Handler> feature) {
        return (Handler) handlersByFeature.get(feature);
    }

    public <Handler> boolean hasHandler(AclFeature<Handler> feature) {
        return handlersByFeature.containsKey(feature);
    }

    @Override
    public String toString() {
        return name() + ":" + Objects.toString(handlersByFeature);
    }
}