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/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: Unique
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2008-2014, OMEX AG, Switzerland
* All rights reserved.
*
* 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 openMDX team 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.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.state2.aop1;
import org.openmdx.base.exception.ServiceException;
import org.openmdx.kernel.exception.BasicException;
import org.openmdx.kernel.jdo.ReducedJDOHelper;
/**
* Unique
*/
final class UniqueValue {
/**
* Constructor
*/
UniqueValue(){
super();
}
/**
*
*/
private T value = null;
/**
*
*/
private boolean empty = true;
/**
* Process a single state's reply
*
* @param value
*
* @throws ServiceException
*/
void set(
T value
) throws ServiceException{
if(this.empty) {
this.value = value;
this.empty = false;
} else if (this.value == null ? value != null : !this.value.equals(value)) {
throw new ServiceException(
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.ILLEGAL_STATE,
"The underlying states have inconsistent values for the given request",
new BasicException.Parameter("values", ReducedJDOHelper.replaceObjectById(this.value), ReducedJDOHelper.replaceObjectById(value))
);
}
}
/**
* Retrieve the consolidated reply
*
* @return the value returned by all underlying states
*
* @exception IllegalStateException if there is no underlying state
*/
T get(
) throws ServiceException {
if(this.empty) {
throw new ServiceException(
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.ILLEGAL_STATE,
"There is no matching state for the given request. "
+ "Consider erroneous behaviour or concurrent modifications as possible reasons."
);
} else {
return this.value;
}
}
/**
* Tells whether no value has been set
*
* @return true if no value has been set
*/
boolean isEmpty(
){
return this.empty;
}
}
