Android Open Source - interdroid-vdb Metadata

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Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

Java Source Code

/*
 * Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights
 * reserved.//  w  w w . j a v a 2 s.  com
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Vrije Universiteit nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package interdroid.vdb.content.metadata;

import interdroid.vdb.content.EntityUriMatcher.UriMatch;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Represents the metadata for a database.
 *
 * @author nick <palmer@cs.vu.nl>
 *
 */
public abstract class Metadata {
  /**
   * Access to logger.
   */
  private static final Logger LOG = LoggerFactory.getLogger(Metadata.class);

  /**
   * The entities that live inside this database.
   */
  private Map<String, EntityInfo> entities =
      new HashMap<String, EntityInfo>();

  /**
   * The namespaces in this database.
   */
  private Map<String, String> namespaces =
      new HashMap<String, String>();

  /**
   * The namespace for this database.
   */
  private final String mNamespace;

  /**
   * Construct a new metadata for the given namespace.
   * @param namespace the namespace for this database
   */
  protected Metadata(final String namespace) {
    LOG.debug("Constructed metadata namespace: " + namespace);
    mNamespace = namespace;
    namespaces.put(mNamespace, mNamespace);
  }

  /**
   * @return the entities in this database.
   */
  public final Collection<EntityInfo> getEntities() {
    return entities.values();
  }

  /**
   * @param name the name of the entity to return
   * @return information on the named entity or null.
   */
  public final EntityInfo getEntity(final String name) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Checking for entity: " + name);
    }

    EntityInfo result = entities.get(name);

    // Check the namespaces then if we are lacking a match
    if (result == null) {
      for (String namespace : namespaces.keySet()) {
        String namespaceName = namespace + "." + name;
        if (LOG.isDebugEnabled()) {
          LOG.debug("Checking for entity: {}.", namespaceName);
        }
        result = entities.get(namespaceName);
        if (result != null) {
          break;
        }
      }
    }

    if (result == null && LOG.isDebugEnabled()) {
      LOG.debug("Not found...");
      for (String key : entities.keySet()) {
        LOG.debug("Existing Entity: {}.", key);
      }
    }

    return result;
  }

  /**
   * @param uriMatch the match to retrieve info for.
   * @return the entity information for the uri contained in the match
   */
  public final EntityInfo getEntity(final UriMatch uriMatch) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Checking for entity named: " + uriMatch.entityName);
    }

    EntityInfo result = getEntity(uriMatch.entityName);

    // Check if this is something inside the parent type(s).
    if (result == null && uriMatch.parentEntityNames != null) {
      String name = uriMatch.entityName;
      for (String parent : uriMatch.parentEntityNames) {
        name = parent + "_" + name;
      }
      result = getEntity(name);
    }

    return result;
  }

  /**
   * Adds an entity to the metadata for this database.
   * @param entityInfo the information on the entity
   */
  public final void put(final EntityInfo entityInfo) {
    if (getEntity(entityInfo.getFullName()) == null) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("Adding entity: " + entityInfo.getFullName());
      }
      entities.put(entityInfo.getFullName(), entityInfo);
      if (!namespaces.containsKey(entityInfo.namespace())) {
        namespaces.put(entityInfo.namespace(), entityInfo.namespace());
      }
    }
  }
}

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