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/**
* ===========================================
* LibLayout : a free Java layouting library
* ===========================================
*
* Project Info: http://reporting.pentaho.org/liblayout/
*
* (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: ChainingComponent.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.util;
import java.util.ArrayList;
import java.util.Arrays;
/**
* A chaining component accepts calls from outside, forwards them to its
* wrapped object, and records all calls to the next chain element. Only
* after the initial call has been fully completed (and thus the wrapped
* object is back in a consistent state) all generated sub-calls will be
* forwarded to the next chain element.
*
* Of course, the whole architecture assumes, that the execution flow is a
* one-way street and that the execution and computation of the n-th step does
* not rely on results and/or the current state of the n+1-th step.
*
* It is guaranteed, that all calls are executed in the same order they have
* been recorded.
*
* @author Thomas Morgner
*/
public abstract class ChainingComponent
{
public static final int STATE_FRESH = 0;
public static final int STATE_ERROR = 1;
public static final int STATE_DONE = 2;
public static class RecordedCall
{
private int methodId;
private Object parameters;
private int state;
public RecordedCall(final int method, final Object parameters)
{
this.methodId = method;
this.parameters = parameters;
}
public int getState()
{
return state;
}
public void setState(final int state)
{
this.state = state;
}
public int getMethod()
{
return methodId;
}
public Object getParameters()
{
return parameters;
}
}
private ArrayList calls;
public ChainingComponent()
{
calls = new ArrayList();
}
public void addCall (final RecordedCall c)
{
calls.add(c);
}
public void clear ()
{
calls.clear();
}
protected RecordedCall[] retrieveRecordedCalls()
{
final RecordedCall[] recordedCalls = (RecordedCall[]) calls.toArray(new RecordedCall[calls.size()]);
calls.clear();
return recordedCalls;
}
public void setRecordedCalls (final RecordedCall[] recordedCalls)
{
calls.addAll(Arrays.asList(recordedCalls));
}
public synchronized void replay (final Object target) throws ChainingCallException
{
// Copy all recorded calls and be done with it.
final RecordedCall[] recordedCalls = retrieveRecordedCalls();
for (int i = 0; i < recordedCalls.length; i++)
{
final RecordedCall call = recordedCalls[i];
if (call.getState() == STATE_FRESH)
{
try
{
invoke(target, call.getMethod(), call.getParameters());
call.setState(STATE_DONE);
}
catch(Exception e)
{
call.setState(STATE_ERROR);
throw new ChainingCallException("Chained Call failed:", e);
}
}
}
}
protected abstract void invoke (Object target, int methodId, Object parameters)
throws Exception;
}
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