Package org.hibernate.ejb.util

Source Code of org.hibernate.ejb.util.LockModeTypeHelper

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*/
package org.hibernate.ejb.util;
import javax.persistence.LockModeType;
import org.hibernate.AssertionFailure;
import org.hibernate.LockMode;

/**
* Helper to deal with {@link LockModeType} <-> {@link LockMode} conversions.
*
* @author Steve Ebersole
*/
public class LockModeTypeHelper {
  public static LockModeType getLockModeType(LockMode lockMode) {
    if ( lockMode == LockMode.NONE ) {
      return LockModeType.NONE;
    }
    else if ( lockMode == LockMode.OPTIMISTIC || lockMode == LockMode.READ ) {
      return LockModeType.OPTIMISTIC;
    }
    else if ( lockMode == LockMode.OPTIMISTIC_FORCE_INCREMENT || lockMode == LockMode.WRITE ) {
      return LockModeType.OPTIMISTIC_FORCE_INCREMENT;
    }
    else if ( lockMode == LockMode.PESSIMISTIC_READ ) {
      return LockModeType.PESSIMISTIC_READ;
    }
    else if ( lockMode == LockMode.PESSIMISTIC_WRITE
        || lockMode == LockMode.UPGRADE
        || lockMode == LockMode.UPGRADE_NOWAIT ) {
      return LockModeType.PESSIMISTIC_WRITE;
    }
    else if ( lockMode == LockMode.PESSIMISTIC_FORCE_INCREMENT
        || lockMode == LockMode.FORCE ) {
      return LockModeType.PESSIMISTIC_FORCE_INCREMENT;
    }
    throw new AssertionFailure( "unhandled lock mode " + lockMode );
  }


  public static LockMode getLockMode(LockModeType lockMode) {
    switch ( lockMode ) {
      case READ:
      case OPTIMISTIC: {
        return LockMode.OPTIMISTIC;
      }
      case OPTIMISTIC_FORCE_INCREMENT:
      case WRITE: {
        return LockMode.OPTIMISTIC_FORCE_INCREMENT;
      }
      case PESSIMISTIC_READ: {
        return LockMode.PESSIMISTIC_READ;
      }
      case PESSIMISTIC_WRITE: {
        return LockMode.PESSIMISTIC_WRITE;
      }
      case PESSIMISTIC_FORCE_INCREMENT: {
        return LockMode.PESSIMISTIC_FORCE_INCREMENT;
      }
      case NONE: {
        return LockMode.NONE;
      }
      default: {
        throw new AssertionFailure( "Unknown LockModeType: " + lockMode );
      }
    }
  }

  public static LockMode interpretLockMode(Object value) {
    if ( value == null ) {
      return LockMode.NONE;
    }
    if ( LockMode.class.isInstance( value ) ) {
      return (LockMode) value;
    }
    else if ( LockModeType.class.isInstance( value ) ) {
      return getLockMode( (LockModeType) value );
    }
    else if ( String.class.isInstance( value ) ) {
      // first try LockMode name
      LockMode lockMode = LockMode.valueOf( (String) value );
      if ( lockMode == null ) {
        try {
          lockMode = getLockMode( LockModeType.valueOf( (String) value ) );
        }
        catch ( Exception ignore ) {
        }
      }
      if ( lockMode != null ) {
        return lockMode;
      }
    }

    throw new IllegalArgumentException( "Unknown lock mode source : " + value );
  }

}
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