/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.trinidad.component;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectInput;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;
/**
* Strongly-typed object for storing UIX Tree State.
* <p>
* @todo All warnings in here map to missing features in our state management
* system.
* @todo Add a decent toString() implementation to improve debugging.
*/
class TreeState implements Externalizable
{
public TreeState()
{
_empty = true;
}
public boolean isEmpty()
{
return _empty;
}
@SuppressWarnings("unchecked")
public void restoreState(FacesContext context, UIXComponentBase component)
{
component.restoreState(context, _state);
int childCount = component.getChildCount();
int arrayCount = (_children == null) ? 0 : _children.length;
int transientCount = 0;
// In Facelets land, we might have transient components *already in* the
// tree - but they won't have had state saved. So, we'd better
// account for those before assuming that our saved state count
// and actual child count can't be reconciled!
if (childCount != arrayCount)
{
List children = component.getChildren();
for (int i = 0; i < childCount; i++)
{
UIComponent child = (UIComponent) children.get(i);
if (child.isTransient())
transientCount++;
}
}
if (arrayCount + transientCount != childCount)
{
if (_LOG.isWarning())
_LOG.warning("SAVED_CHILD_COUNT_NOT_MATCH", new Object[] {arrayCount, childCount});
}
else
{
List children = component.getChildren();
int arrayIndex = 0;
for (int i = 0; i < childCount; i++)
{
UIComponent child = (UIComponent) children.get(i);
if (child.isTransient())
{
continue;
}
else
{
child.processRestoreState(context, _children[arrayIndex]);
arrayIndex++;
}
}
}
// Restore the facets' state
if (_facets != null)
{
assert(_facets.length % 2 == 0);
int facetCount = _facets.length / 2;
// If our count is off, log a warning
if (facetCount < component.getFacetCount())
{
if (_LOG.isWarning())
_LOG.warning("FACETS_STATE_MISSING_WILLNOT_RESTORE", component);
}
for (int i = 0; i < facetCount; i++)
{
assert((_facets[i * 2] == null) ||
(_facets[i * 2] instanceof String));
String facetName = (String) _facets[i * 2];
if (facetName == null)
continue;
Object facetState = _facets[i * 2 + 1];
UIComponent facet = component.getFacet(facetName);
if (facet == null)
{
if (_LOG.isWarning())
_LOG.warning("DISCARDING_SAVED_STATE", facetName);
}
else
{
if (facet.isTransient())
{
if (facetState != null)
{
if (_LOG.isWarning())
_LOG.warning("SAVED_STATE_INCLUDE_TRANSIENT_COMPONENT_STATE", facet);
}
}
else
{
facet.processRestoreState(context, facetState);
}
}
}
}
}
@SuppressWarnings("unchecked")
public void saveState(FacesContext context, UIXComponentBase component)
{
// Save the component's state
_state = component.saveState(context);
if (_state != null)
_empty = false;
// Save the children's state
int childCount = component.getChildCount();
if (childCount == 0)
{
_children = null;
}
else
{
_children = new Object[childCount];
List children = component.getChildren();
int j = 0;
for (int i = 0; i < childCount; i++)
{
UIComponent child = (UIComponent) children.get(i);
if (!child.isTransient())
{
Object childState = child.processSaveState(context);
if (childState != null)
{
_empty = false;
_children[j] = childState;
}
j++;
}
}
// OK - there were some transient components, so the array's too big;
// trim it down
if (j < childCount)
{
Object[] newChildren = new Object[j];
System.arraycopy(_children, 0, newChildren, 0, j);
_children = newChildren;
}
}
// Save the facets' state
int facetCount = component.getFacetCount();
if (facetCount == 0)
{
_facets = null;
}
else
{
_facets = new Object[facetCount * 2];
int i = 0;
Set<Map.Entry<String, UIComponent>> entries = component.getFacets().entrySet();
for(Map.Entry<String, UIComponent> entry : entries)
{
UIComponent facet = entry.getValue();
// Just skip over transient facets
if (facet.isTransient())
continue;
Object facetState = facet.processSaveState(context);
if (facetState != null)
{
_empty = false;
_facets[2 * i] = entry.getKey();
_facets[2 * i + 1] = facetState;
}
i++;
}
// If there's no non-transient facets, then bail
if (i == 0)
_facets = null;
}
}
//
// Implementation of Externalizable - just a bit easier on output
// size, for very little work.
//
public void writeExternal(ObjectOutput out) throws IOException
{
out.writeObject(_state);
out.writeObject(_facets);
out.writeObject(_children);
}
public void readExternal(ObjectInput in)
throws IOException, ClassNotFoundException
{
_state = in.readObject();
_facets = (Object[]) in.readObject();
_children = (Object[]) in.readObject();
}
private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(TreeState.class);
private Object[] _facets;
private Object[] _children;
private Object _state;
private boolean _empty;
private static final long serialVersionUID = 1L;
}