org.ldp4j.application.kernel.session.MemberCollection.java Source code

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Here is the source code for org.ldp4j.application.kernel.session.MemberCollection.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-kernel-core:0.2.1
 *   Bundle      : ldp4j-application-kernel-core-0.2.1.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.kernel.session;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.ldp4j.application.kernel.resource.Container;
import org.ldp4j.application.kernel.resource.Member;
import org.ldp4j.application.kernel.resource.Resource;
import org.ldp4j.application.kernel.resource.ResourceId;
import org.ldp4j.application.kernel.resource.ResourceVisitor;
import org.ldp4j.application.session.ResourceSnapshot;

import com.google.common.base.MoreObjects;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

final class MemberCollection {

    private final Map<ResourceId, DelegatedResourceSnapshot> members;
    private final List<DelegatedResourceSnapshot> newMembers;

    private MemberCollection() {
        this.members = Maps.newLinkedHashMap();
        this.newMembers = Lists.newLinkedList();
    }

    private void registerMember(DelegatedResourceSnapshot snapshot) {
        checkState(!members.containsKey(snapshot.resourceId()),
                "A resource with id '%s' is already a member of the container", snapshot.resourceId());
        this.members.put(snapshot.resourceId(), snapshot);
    }

    Set<DelegatedResourceSnapshot> members() {
        return Collections.unmodifiableSet(new LinkedHashSet<DelegatedResourceSnapshot>(this.members.values()));
    }

    boolean hasMember(ResourceSnapshot resource) {
        return this.members.containsValue(resource);
    }

    void addMember(DelegatedResourceSnapshot snapshot) {
        checkNotNull(snapshot, "Member cannot be null");
        registerMember(snapshot);
        this.newMembers.add(snapshot);
    }

    boolean removeMember(ResourceSnapshot member) {
        if (member == null) {
            return false;
        }
        boolean result = this.members.containsValue(member);
        if (result) {
            ResourceId memberId = ResourceId.createId(member.name(), member.templateId());
            this.members.remove(memberId);
            this.newMembers.remove(member);
        }
        return result;
    }

    List<DelegatedResourceSnapshot> newMembers() {
        return Collections.unmodifiableList(this.newMembers);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(getClass()).add("members", this.members.keySet()).toString();
    }

    static MemberCollection newInstance() {
        return new MemberCollection();
    }

    static MemberCollection createFromResource(Resource resource, final DelegatedWriteSession session) {
        final MemberCollection memberRepository = new MemberCollection();
        resource.accept(new ResourceVisitor() {
            @Override
            public void visitResource(Resource resource) {
                // Nothing to do
            }

            @Override
            public void visitContainer(Container resource) {
                for (Member member : resource.members()) {
                    DelegatedResourceSnapshot memberResourceSnapshot = session.resolveResource(member.memberId());
                    checkState(memberResourceSnapshot != null, "Could not resolve member %s of container %s",
                            member, resource);
                    memberRepository.registerMember(memberResourceSnapshot);
                }
            }
        });
        return memberRepository;
    }

}