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/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: AbstractStateContext
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2008, 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.spi;
import java.util.Date;
import javax.resource.cci.InteractionSpec;
import org.openmdx.state2.cci.StateContext;
import org.openmdx.state2.cci.ViewKind;
import org.w3c.format.DateTimeFormat;
/**
* AbstractStateContext
*/
public abstract class StateViewContext
implements InteractionSpec, StateContext
{
/**
* Constructor
*
* @param viewKind
* @param validAt
* @param existsAt the transaction time point, or null for an up-to-date view
* @param lowerBound
* @param upperBound
* @param includeUpperBound
*/
protected StateViewContext(
ViewKind viewKind,
V validAt,
Date existsAt,
V lowerBound,
V upperBound,
boolean includeUpperBound
) {
this.viewKind = viewKind;
this.validAt = validAt;
this.existsAt = existsAt;
this.lowerBound = lowerBound;
this.upperBound = upperBound;
StringBuilder id = new StringBuilder();
switch (viewKind) {
case TIME_POINT_VIEW:
if(validAt == null) {
id.append('?');
} else {
id.append(toString(validAt));
}
if(existsAt != null){
id.append(
'@'
).append(
DateTimeFormat.BASIC_UTC_FORMAT.format(getExistsAt())
);
}
break;
case TIME_RANGE_VIEW:
if(lowerBound == null) {
id.append("(-\u221E");
} else {
id.append(
'['
).append(
toString(lowerBound)
);
}
id.append(',');
if(upperBound == null) {
id.append("\u221E)");
} else {
id.append(
toString(upperBound)
).append(
includeUpperBound ? ']' : ')'
);
}
break;
}
this.id = id.toString();
}
/**
*
*/
private final ViewKind viewKind;
/**
*
*/
private final V validAt;
/**
*
*/
private final Date existsAt;
/**
* validFrom
*/
private final V lowerBound;
/**
* validTo or invalidFrom
*/
private final V upperBound;
/**
* The state context's id
*/
private final String id;
/**
* Implements Serializable
*/
private static final long serialVersionUID = 113453722360985152L;
/**
* Tests the transaction time
*
* @param existsAt null stands for the "head"
* @param createdAt
* @param removedAt
*
* @return true if the entry exists at the given transaction time
*/
public static boolean compareTransactionTime(
Date existsAt,
Date createdAt,
Date removedAt
){
return existsAt == null ? removedAt == null : (
(createdAt != null && !existsAt.before(createdAt)) &&
(removedAt == null || existsAt.before(removedAt))
);
}
//------------------------------------------------------------------------
// Implements StateContext
//------------------------------------------------------------------------
/* (non-Javadoc)
* @see org.openmdx.state2.cci.StateContext#getViewKind()
*/
public ViewKind getViewKind() {
return this.viewKind;
}
/* (non-Javadoc)
* @see org.openmdx.state2.cci.StateContext#getExistsAt()
*/
public Date getExistsAt() {
return this.existsAt;
}
/**
* A time point view's validAt
*
* @return validAt in case of a TIME_POINT_VIEW,
* null otherwise
*/
public V getValidAt(
){
return
this.validAt == null && this.viewKind == ViewKind.TIME_POINT_VIEW ? newValidAt() :
this.validAt;
}
/**
* Retrieve validAt's default value
*
* @return validAt's default value
*/
protected abstract V newValidAt();
/**
* Tells from when on modifications are valid
*
* @return the view's validFrom
*/
public V getValidFrom(
){
return this.lowerBound;
}
/**
* Tells up to when modifications are valid
*
* @return the view's validFrom
*/
protected V getUpperBound(
){
return this.upperBound;
}
/**
* Convert a valid time point into its XML format
*
* @param timePoint
*
* @return the time points string representation
*/
protected abstract String toString(
V timePoint
);
//------------------------------------------------------------------------
// Extends Object
//------------------------------------------------------------------------
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
return
obj instanceof StateViewContext &&
this.id.equals(((StateViewContext)obj).id);
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return this.id.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return this.id;
}
}
