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Public API for the Apache MyFaces Trinidad project
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/*
* 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.model;
import java.util.HashMap;
import java.util.Map;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
/**
*
* There are two common scenarios for processes,
* "Plus One" and "Max Visited" which are explained below.
*
* - "Plus One" - from the current step the user can
* navigate to any previous page and the next page.
* If the user is on the 5th step of a process
* and goes back to step 2, then the user can only
* navigate from step 2 to step 1 and step 3.
*
* - "Max Visited" - the user can navigate to the max
* visited page. If the user is currently on the max
* visited page then the user can also navigate to
* the next page. If the user is on the 5th step of a
* process and goes back to step 2, then the user can
* navigate from step 2 to steps 1, 2, 3, 4, and 5.
*
*
*
*
*
* A node in a process should be readOnly
* if that step of the process is not reachable from the current
* step.
*
*
* A node in a process should be immediate if the values
* in the current step don't need to be validated.
*
*
*/
public class ProcessUtils
{
//**********************************
// Plus One Process methods
//**********************************
/**
*
*
* Determines immediate for a "plus one" process.
* Immediate will be true for any previous step, and false otherwise.
* For example if the user is on step 5
* and goes back to step 2, the user will have to come back
* to step 5 again, so the fields on page 5 don't need to
* be validated when going back to steps 1,2,3,4, but should be
* validated when going to step 6.
*
*
*
* @param model the model instance to use.
* When the model is passed in a call to model.getPath should return the
* path for the "current" node.
* @param defaultReturnValue if the current and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node should be immediate.
*/
public static boolean isImmediate(
MenuModel model,
boolean defaultReturnValue
)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors(model,
focusPath,
currPath);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
model.setRowKey(focusPath);
int focusIndex = model.getRowIndex();
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (currIndex < focusIndex)
return true;
return false;
}
/**
*
* Determines readOnly for a "plus one" process.
* ReadOnly will be true for any step past the next available step
*
* @param model the model instance to use.
* When the model is passed in a call to model.getPath should return the
* path for the "current" node.
* @param defaultReturnValue if the current and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node should be immediate.
*/
public static boolean isReadOnly(
MenuModel model,
boolean defaultReturnValue
)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors(model,
focusPath,
currPath);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
if (focusPath.equals(currPath))
{
model.setRowKey(currPath);
return true;
}
model.setRowKey(focusPath);
int focusIndex = model.getRowIndex();
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (currIndex > (focusIndex + 1))
return true;
return false;
}
private static boolean _hasDifferentAncestors(
MenuModel model,
Object key1,
Object key2
)
{
// if either key is null return true
if ( key1 == null || key2 == null)
return true;
int depth = model.getDepth(key2);
if ( depth != model.getDepth(key1))
{
return true;
}
if (depth > 0)
{
model.setRowKey(key1);
Object key1ParentPath = model.getContainerRowKey();
model.setRowKey(key2);
Object key2ParentPath = model.getContainerRowKey();
if (!key2ParentPath.equals(key1ParentPath))
{
return true;
}
}
return false;
}
//**********************************
// Max process methods
//**********************************
/**
*
* Determines immediate for a "max visited" process.
* When the current step and the max step are the same
* immediate will be true for any previous step, and false otherwise.
* If the current step is before the max step,
* immediate will be false.
*
* @param model the model instance to use.
* When the model is passed in a call to model.getRowKey should return the
* rowKey for the "current" node.
* @param maxVisitedRowKey the rowKey to use to determine the max node
* @param defaultReturnValue if the current, max, and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node should be immediate.
*/
public static boolean isImmediate(
MenuModel model,
Object maxVisitedRowKey,
boolean defaultReturnValue
)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors(model,
focusPath,
currPath,
maxVisitedRowKey);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
model.setRowKey(focusPath);
int focusIndex = model.getRowIndex();
model.setRowKey(maxVisitedRowKey);
int maxIndex = model.getRowIndex();
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (maxIndex == focusIndex &&
currIndex < focusIndex)
return true;
return false;
}
/**
*
* Determines readOnly for a "max visited" process.
* When the current step and the max step are the same,
* readOnly will be true for any step past the next available step.
* If the current step is before the max step,
* then readOnly will be true for any step past the max step.
*
* @param model the model instance to use.
* When the model is passed in a call to model.getRowKey should return the
* rowKey for the "current" node.
* @param maxVisitedRowKey the rowKey to use to determine the max node
* @param defaultReturnValue if the current, max, and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node should be immediate.
*/
public static boolean isReadOnly(
MenuModel model,
Object maxVisitedRowKey,
boolean defaultReturnValue
)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors(model,
focusPath,
currPath,
maxVisitedRowKey);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
if (focusPath.equals(currPath))
{
model.setRowKey(currPath);
return true;
}
model.setRowKey(focusPath);
int focusIndex = model.getRowIndex();
model.setRowKey(maxVisitedRowKey);
int maxIndex = model.getRowIndex();
if (maxIndex == focusIndex)
maxIndex = maxIndex + 1;
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (currIndex > maxIndex)
return true;
return false;
}
// Plus One case
/**
* For the Plus One case, a stop is considered visited if,
* - it's before the current or,
* - is the current stop itself
*
* @param model the menuModel instance to use. When the model is passed in,
* a call to model.getRowKey should return the rowKey for the "current" node.
* @param defaultReturnValue if the current and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node has been visited.
*/
public static boolean isVisited(
MenuModel model,
boolean defaultReturnValue
)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors (model,
focusPath,
currPath);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
// current node is active
if (focusPath.equals(currPath))
{
model.setRowKey(currPath);
return true;
}
// nodes before the current node are visited
model.setRowKey(focusPath);
int focusIndex = model.getRowIndex();
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (currIndex <= focusIndex)
return true;
return false;
}
/**
* For the Max Visited case, a stop is considered visited if
* - a stop is before the active stop
* - or is the active stop
*
* @param model the menuModel instance to use. When the model is passed in, a
* call to model.getRowKey should return the rowKey for the "current" node.
* @param maxVisitedRowKey the rowKey to use to determine the max visited node
* @param defaultReturnValue if the current, maxVisited and focus nodes aren't
* siblings in the tree, this value will be returned.
* @return whether or not the current node has been visited.
*/
public static boolean isVisited (
MenuModel model,
Object maxVisitedRowKey,
boolean defaultReturnValue)
{
Object focusPath = model.getFocusRowKey();
Object currPath = model.getRowKey();
boolean returnDefault = _hasDifferentAncestors(model,
focusPath,
currPath,
maxVisitedRowKey);
if (returnDefault)
{
model.setRowKey(currPath);
return defaultReturnValue;
}
// on active node
if (focusPath.equals(currPath))
{
model.setRowKey(currPath);
return true;
}
model.setRowKey(maxVisitedRowKey);
int maxIndex = model.getRowIndex();
model.setRowKey(currPath);
int currIndex = model.getRowIndex();
if (currIndex <= maxIndex)
return true;
return false;
}
/**
* Get the rowKey of the max visited node in the respective process.
* If null set maxVisitedRowKey to be the focus rowKey.
* If set but the focus rowKey is after maxVisitedRowKey,
* set maxVisitedRowKey to the focus rowKey.
*
* @param model the model instance to use.
* When the model is passed in a call to model.getRowKey should return the
* key for the "current" node.
* @param maxPathKey this key is used to store the maxVisitedRowKey in both the
* session and request map.
* @return the rowKey to the "max visited" node.
*/
@SuppressWarnings("unchecked")
public static Object getMaxVisitedRowKey(
MenuModel model,
String maxPathKey
)
{
assert(maxPathKey != null);
ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
Map requestMap = externalContext.getRequestMap();
Object maxRowKey = requestMap.get(maxPathKey);
boolean mustCompareWithFocusRow = true;
//TODO - if I change this to use pageFlowScope it doesn't work.
// figure out why.
Map sessionMap = externalContext.getSessionMap();
Map maxPathMap = (Map)sessionMap.get(maxPathKey);
if (maxPathMap == null)
maxPathMap = new HashMap();
Object focusRowKey = model.getFocusRowKey();
Object parentRowKey = model.getContainerRowKey(focusRowKey);
if (parentRowKey == null)
parentRowKey = _MAX_PATH_TOP;
if (maxRowKey == null)
{
maxRowKey = maxPathMap.get(parentRowKey);
if (maxRowKey == null)
{
maxRowKey = focusRowKey;
maxPathMap.put(parentRowKey, maxRowKey);
sessionMap.put(maxPathKey, maxPathMap);
// for fast access store maxRowKey in the requestMap
requestMap.put(maxPathKey, maxRowKey);
mustCompareWithFocusRow = false;
}
}
if (mustCompareWithFocusRow)
{
// figure out if focusRowKey > maxPath, if so set a new maxPath,
// the result is set on the request so we do this once per request.
Object currPath = model.getRowKey();
boolean hasDifferentAncestors = _hasDifferentAncestors(model,
focusRowKey,
maxRowKey);
//TODO - should I default this to focusPath?
if (hasDifferentAncestors)
{
model.setRowKey(currPath);
return null;
}
model.setRowKey(focusRowKey);
int focusRowIndex = model.getRowIndex();
model.setRowKey(maxRowKey);
int maxRowIndex = model.getRowIndex();
if (focusRowIndex > maxRowIndex)
{
maxPathMap.put(parentRowKey, focusRowKey);
sessionMap.put(maxPathKey, maxPathMap);
requestMap.put(maxPathKey, focusRowKey);
}
else
{
requestMap.put(maxPathKey, maxRowKey);
}
model.setRowKey(currPath);
}
return maxRowKey;
}
@SuppressWarnings("unchecked")
public static void clearMaxPath(
String maxPathKey
)
{
if (maxPathKey != null)
{
Map sessionMap = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
sessionMap.put(maxPathKey, null);
}
}
private static boolean _hasDifferentAncestors(
MenuModel model,
Object key1,
Object key2,
Object key3
)
{
boolean diff1 = _hasDifferentAncestors(model, key1, key2);
if (diff1)
return true;
boolean diff2 = _hasDifferentAncestors(model, key1, key3);
if ( diff2)
return true;
return false;
}
private static final Object _MAX_PATH_TOP = new Object();
}