org.plasma.profile.ProfileConfig Maven / Gradle / Ivy

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/**
 * Copyright 2017 TerraMeta Software, Inc.
 * 
 * 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 org.plasma.profile;

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBException;
import javax.xml.bind.UnmarshalException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.plasma.common.bind.DefaultValidationEventHandler;
import org.plasma.common.exception.PlasmaRuntimeException;
import org.plasma.profile.adapter.ProfileArtifactAdapter;
import org.plasma.runtime.ConfigurationException;
import org.xml.sax.SAXException;

/**
 * Supports the configuration and dynamic, on-demand loading of PlasmaSDO
 * Profile and related UML artifacts across multiple profile version.
 */
public class ProfileConfig {

  private static Log log = LogFactory.getLog(ProfileConfig.class);
  private static volatile ProfileConfig instance = null;

  private static final String defaultConfigFileName = "profile-config.xml";
  private String configFileName;
  private long configFileLastModifiedDate = System.currentTimeMillis();
  private ProfileConfiguration config;
  private Map artifactURNMap = new HashMap();
  private Map artifactURIMap = new HashMap();

  private ProfileConfig() {
    log.debug("initializing...");
    try {
      this.configFileName = defaultConfigFileName;
      ProfileConfigDataBinding configBinding = new ProfileConfigDataBinding(
          new ProfileConfigValidationEventHandler());

      config = unmarshalConfig(this.configFileName, configBinding);

      for (ProfileArtifact artifact : config.getArtifacts()) {
        artifactURNMap.put(artifact.getUrn(), new ProfileArtifactAdapter(artifact));
        artifactURIMap.put(artifact.getNamespaceUri(), new ProfileArtifactAdapter(artifact));
      }
    } catch (SAXException e) {
      throw new ConfigurationException(e);
    } catch (JAXBException e) {
      throw new ConfigurationException(e);
    }
  }

  public ProfileArtifactAdapter findArtifactByUrn(ProfileURN urn) {
    return this.artifactURNMap.get(urn);
  }

  public ProfileArtifactAdapter findArtifactByUri(String namespaceUri) {
    return this.artifactURIMap.get(namespaceUri);
  }

  public Collection getArtifacts() {
    return Collections.unmodifiableCollection(this.artifactURNMap.values());
  }

  public String getConfigFileName() {
    return configFileName;
  }

  public long getConfigFileLastModifiedDate() {
    return configFileLastModifiedDate;
  }

  private ProfileConfiguration unmarshalConfig(String configFileName,
      ProfileConfigDataBinding binding) {
    try {
      InputStream stream = ProfileConfig.class.getResourceAsStream(configFileName);
      if (stream == null)
        stream = ProfileConfig.class.getClassLoader().getResourceAsStream(configFileName);
      if (stream == null)
        throw new ConfigurationException("could not find configuration file resource '"
            + configFileName + "' on the current classpath");

      ProfileConfiguration result = (ProfileConfiguration) binding.validate(stream);

      URL url = ProfileConfig.class.getResource(configFileName);
      if (url == null)
        url = ProfileConfig.class.getClassLoader().getResource(configFileName);
      if (url != null) {
        File urlFile = new File(url.getFile());
        if (urlFile.exists())
          this.configFileLastModifiedDate = urlFile.lastModified();
      }

      return result;
    } catch (UnmarshalException e) {
      throw new ConfigurationException(e);
    } catch (JAXBException e) {
      throw new ConfigurationException(e);
    }
  }

  public void marshal(OutputStream stream) {
    try {
      ProfileConfigDataBinding configBinding = new ProfileConfigDataBinding(
          new DefaultValidationEventHandler());
      configBinding.marshal(this.config, stream);
    } catch (JAXBException e1) {
      throw new ConfigurationException(e1);
    } catch (SAXException e1) {
      throw new ConfigurationException(e1);
    }
  }

  public static ProfileConfig getInstance() throws PlasmaRuntimeException {
    if (instance == null)
      initializeInstance();
    return instance;
  }

  private static synchronized void initializeInstance() throws ConfigurationException {
    if (instance == null)
      instance = new ProfileConfig();
  }

  public ProfileConfiguration getConfig() {
    return config;
  }

}