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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: DefaultElementContext.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.context;
import java.util.HashMap;
public class DefaultElementContext implements ElementContext
{
private HashMap strings;
private HashMap counters;
private ElementContext parentContext;
public DefaultElementContext(final ElementContext parentContext)
{
this.parentContext = parentContext;
}
/**
* Returns the value for the given counter. If no counter exists under that
* name, this method returns 0.
*
* @param counterName
* @return the value for the given counter.
*/
public int getCounterValue(final String counterName)
{
if (counters != null)
{
final Integer counterValue = (Integer) counters.get(counterName);
if (counterValue != null)
{
return counterValue.intValue();
}
}
if (parentContext != null)
{
return parentContext.getCounterValue(counterName);
}
return 0;
}
/**
* Increments the counter with the given name. If no counter is known under
* that name, the root node will create one.
*
* @param name
* @param value
*/
public void incrementCounter(final String name, final int value)
{
// Step 1: Check if the counter is locally defined.
if (counters != null)
{
if (counters.containsKey(name))
{
final int oldValue = getCounterValue(name);
counters.put(name, new Integer(oldValue + value));
return;
}
}
// check if we have a parent, which may know that counter ...
if (parentContext != null)
{
parentContext.incrementCounter(name, value);
return;
}
// ok, being desperate: Create a new one ..
final int oldValue = getCounterValue(name);
if (counters == null)
{
counters = new HashMap();
}
counters.put(name, new Integer(oldValue + value));
}
/**
* Reseting an counter creates a new Counter-Instance. Counters from parent
* elements are not affected and remain unchanged. All further operations
* issued by all sub-elements will now work with this counter.
*
* @param name
* @param value
*/
public void resetCounter(final String name, final int value)
{
if (counters == null)
{
counters = new HashMap();
}
counters.put(name, new Integer(value));
}
public boolean isCounterDefined(final String counterName)
{
if (counters == null)
{
return false;
}
return counters.containsKey(counterName);
}
/**
* Sets a named string.
*
* @param name the name
* @param value the value
* @param define if set to true, this defines a new nesting context.
*/
public void setString(final String name, final String value, final boolean define)
{
if (!define)
{
// not define ...
if (parentContext != null)
{
parentContext.setString(name, value, define);
return;
}
}
if (value == null)
{
if (strings != null)
{
strings.remove(name);
}
// else ignore the request
}
else
{
if (strings == null)
{
strings = new HashMap();
}
strings.put(name, value);
}
}
/**
* Retrieves the value for a given string. The value returned always
* represents the *actual* value, ignoring any possibly defined
* page-policies.
*
* @param name
* @return
*/
public String getString(final String name)
{
if (strings != null)
{
final String value = (String) strings.get(name);
if (value != null)
{
return value;
}
}
if (parentContext != null)
{
return parentContext.getString(name);
}
else
{
return null;
}
}
}
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