org.eclipse.gyrex.persistence.internal.storage.RepositoryDefinition.java Source code

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Here is the source code for org.eclipse.gyrex.persistence.internal.storage.RepositoryDefinition.java

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/*******************************************************************************
 * Copyright (c) 2011 AGETO 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.persistence.internal.storage;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;

import org.eclipse.gyrex.persistence.storage.registry.IRepositoryDefinition;
import org.eclipse.gyrex.persistence.storage.settings.IRepositoryPreferences;

import org.eclipse.core.runtime.PlatformObject;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.osgi.util.NLS;

import org.osgi.service.prefs.BackingStoreException;

import org.apache.commons.lang.StringUtils;

/**
 * A repository definition.
 */
public class RepositoryDefinition extends PlatformObject implements IRepositoryDefinition {

    private static final String KEY_TAGS = "tags";
    private static final String KEY_TYPE = "type";

    private final IEclipsePreferences storage;
    private final String repositoryId;
    private volatile RepositoryPreferences repositoryPreferences;

    RepositoryDefinition(final String repositoryId, final IEclipsePreferences storage) {
        this.repositoryId = repositoryId;
        this.storage = storage;
    }

    @Override
    public void addTag(final String tag) {
        if (StringUtils.isBlank(tag)) {
            return;
        }
        final HashSet<String> tags = new HashSet<String>(getTags());
        if (tags.contains(tag)) {
            return;
        }
        tags.add(tag);
        setTags(tags);
    }

    private void checkExist() {
        try {
            if (!storage.nodeExists("")) {
                throw new IllegalStateException(
                        NLS.bind("Repository definition for repository ''{0}'' does not exist!", repositoryId));
            }
        } catch (final BackingStoreException e) {
            throw new IllegalStateException(
                    NLS.bind("Error accessing preferences store for repository ''{0}'': {1}", repositoryId,
                            e.getMessage()),
                    e);
        }
    }

    @Override
    public String getProviderId() {
        checkExist();
        return storage.get(KEY_TYPE, null);
    }

    @Override
    public String getRepositoryId() {
        return repositoryId;
    }

    @Override
    public IRepositoryPreferences getRepositoryPreferences() {
        if (null != repositoryPreferences) {
            return repositoryPreferences;
        }

        return repositoryPreferences = new RepositoryPreferences((IEclipsePreferences) storage.node("data"));
    }

    @Override
    public Collection<String> getTags() {
        checkExist();
        return Collections
                .unmodifiableCollection(Arrays.asList(StringUtils.split(storage.get(KEY_TAGS, StringUtils.EMPTY))));
    }

    @Override
    public void removeTag(final String tag) {
        if (StringUtils.isBlank(tag)) {
            return;
        }
        final HashSet<String> tags = new HashSet<String>(getTags());
        if (!tags.contains(tag)) {
            return;
        }
        tags.remove(tag);
        setTags(tags);
    }

    void setProviderId(final String providerId) {
        try {
            checkExist();
            if (storage.get(KEY_TYPE, null) != null) {
                throw new IllegalStateException(
                        NLS.bind("Repository type for repository ''{0}'' already set!", repositoryId));
            }
            storage.put(KEY_TYPE, providerId);
            storage.flush();
        } catch (final BackingStoreException e) {
            throw new IllegalStateException(
                    NLS.bind("Error creating repository definition ''{0}'': {1}", repositoryId, e.getMessage()), e);
        }

    }

    private void setTags(final Collection<String> tags) {
        try {
            storage.sync();
            if (!tags.isEmpty()) {
                storage.put(KEY_TAGS, StringUtils.join(tags, ' '));
            } else {
                storage.remove(KEY_TAGS);
            }
            storage.flush();
        } catch (final BackingStoreException e) {
            throw new IllegalStateException(NLS.bind("Error adding tags to repository definition ''{0}'': {1}",
                    repositoryId, e.getMessage()), e);
        }
    }

}