org.eclipse.gyrex.cloud.internal.admin.NodeDescriptor.java Source code

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Here is the source code for org.eclipse.gyrex.cloud.internal.admin.NodeDescriptor.java

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/*******************************************************************************
 * Copyright (c) 2011, 2012 AGETO Service GmbH and others.
 * All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors:
 *     Gunnar Wagenknecht - initial API and implementation
 *******************************************************************************/
package org.eclipse.gyrex.cloud.internal.admin;

import java.util.Collections;
import java.util.Set;

import org.eclipse.gyrex.cloud.admin.INodeDescriptor;
import org.eclipse.gyrex.cloud.internal.zk.ZooKeeperNodeInfo;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

/**
 * {@link INodeDescriptor} implementation which supports dynamic/lazy loading.
 */
public class NodeDescriptor implements INodeDescriptor {

    private final String nodeId;
    private ZooKeeperNodeInfo info;
    private final boolean approved;

    /**
     * Creates a new instance.
     * 
     * @param nodeId
     */
    public NodeDescriptor(final String nodeId, final boolean approved) {
        this.nodeId = nodeId;
        this.approved = approved;
    }

    private ZooKeeperNodeInfo ensureInfo() {
        if (info != null) {
            return info;
        }

        info = ZooKeeperNodeInfo.load(nodeId, approved);
        if (info == null) {
            throw new IllegalStateException("node info not available!");
        }

        return info;
    }

    @Override
    public String getId() {
        return nodeId;
    }

    @Override
    public String getLocation() {
        final String location = ensureInfo().getLocation();
        if (location == null) {
            return "unknown";
        }
        return location;
    }

    @Override
    public String getName() {
        final String name = ensureInfo().getName();
        if (name == null) {
            return "";
        }
        return name;
    }

    @Override
    public Set<String> getTags() {
        final Set<String> roles = ensureInfo().getTags();
        if (roles == null) {
            return Collections.emptySet();
        }
        return Collections.unmodifiableSet(roles);
    }

    @Override
    public boolean isApproved() {
        return approved;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.NO_FIELD_NAMES_STYLE).append("id", nodeId)
                .append("approved", approved).append("info", info).toString();
    }
}