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phloc basic database API stuff
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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * 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 com.phloc.db.api.h2;

import java.util.Map;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

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

import com.phloc.commons.annotations.Nonempty;
import com.phloc.commons.string.StringHelper;
import com.phloc.db.api.CJDBC_H2;

@Immutable
public final class H2Helper
{
  private static final Logger s_aLogger = LoggerFactory.getLogger (H2Helper.class);

  private H2Helper ()
  {}

  /**
   * Build the final connection string from the base JDBC URL and an optional
   * set of connection properties.
   * 
   * @param sJdbcURL
   *        The base JDBC URL. May neither be null nor empty and
   *        must started with {@link CJDBC_H2#CONNECTION_PREFIX}
   * @param aConnectionProperties
   *        An optional map with connection properties. May be null
   *        .
   * @return The final JDBC connection string to be used. Never
   *         null or empty
   */
  @Nonnull
  @Nonempty
  public static String buildJDBCString (@Nonnull @Nonempty final String sJdbcURL,
                                        @Nullable final Map  aConnectionProperties)
  {
    if (StringHelper.hasNoText (sJdbcURL))
      throw new IllegalArgumentException ("JDBC URL may not be empty!");
    if (!sJdbcURL.startsWith (CJDBC_H2.CONNECTION_PREFIX))
      s_aLogger.error ("The JDBC URL '" + sJdbcURL + "' does not seem to be a H2 connection string!");

    // Add the connection properties to the JDBC string
    final StringBuilder aSB = new StringBuilder (sJdbcURL);
    if (aConnectionProperties != null)
      for (final Map.Entry  aEntry : aConnectionProperties.entrySet ())
        aSB.append (';').append (aEntry.getKey ()).append ('=').append (aEntry.getValue ());
    return aSB.toString ();
  }
}