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/*
* IzPack - Copyright 2001-2012 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/
* http://izpack.codehaus.org/
*
* Copyright 2012 Tim Anderson
*
* Licensed 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 com.izforge.izpack.installer.panel;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.izforge.izpack.api.adaptator.IXMLElement;
import com.izforge.izpack.api.adaptator.impl.XMLElementImpl;
import com.izforge.izpack.api.data.AutomatedInstallData;
import com.izforge.izpack.api.data.DynamicInstallerRequirementValidator;
import com.izforge.izpack.api.data.InstallData;
import com.izforge.izpack.api.data.Panel;
import com.izforge.izpack.api.data.PanelActionConfiguration;
import com.izforge.izpack.api.factory.ObjectFactory;
import com.izforge.izpack.api.handler.AbstractUIHandler;
import com.izforge.izpack.api.installer.DataValidator;
import com.izforge.izpack.api.resource.Messages;
import com.izforge.izpack.api.rules.Condition;
import com.izforge.izpack.data.PanelAction;
import com.izforge.izpack.data.PanelAction.ActionStage;
/**
* Encapsulates a {@link Panel} and its user-interface representation.
*
* @author Tim Anderson
*/
public abstract class AbstractPanelView implements PanelView
{
/**
* The panel.
*/
private final Panel panel;
/**
* The panel user interface class.
*/
private final Class viewClass;
/**
* The factory for creating the view.
*/
private final ObjectFactory factory;
/**
* The panel index.
*/
private int index;
/**
* The panel user interface.
*/
private T view;
/**
* Determines if the user interface is visible.
*/
private boolean visible = true;
/**
* Ordered list of panel data validators
*/
private List validators = new ArrayList();
/**
* The installation data.
*/
private final InstallData installData;
/**
* Actions to invoke prior to the panel being displayed.
*/
private final List preActivationActions = new ArrayList();
/**
* Actions to invoke prior to the panel being validated.
*/
private final List preValidationActions = new ArrayList();
/**
* Actions to invoke after the panel being validated.
*/
private final List postValidationActions = new ArrayList();
/**
* The logger.
*/
private static final Logger logger = Logger.getLogger(AbstractPanelView.class.getName());
/**
* Constructs a {@code PanelView}.
*
* @param panel the panel
* @param viewClass the panel user interface class
* @param factory the factory for creating the view
* @param installData the installation data
*/
public AbstractPanelView(Panel panel, Class viewClass, ObjectFactory factory, InstallData installData)
{
this.panel = panel;
this.viewClass = viewClass;
this.factory = factory;
this.installData = installData;
}
/**
* Returns the panel identifier.
*
* @return the panel identifier
*/
@Override
public String getPanelId()
{
return panel.getPanelId();
}
/**
* Returns the panel.
*
* @return the panel
*/
@Override
public Panel getPanel()
{
return panel;
}
/**
* Returns the panel index.
*
* This is the offset of the panel relative to the other panels, visible or not.
*
* @return the panel index
*/
@Override
public int getIndex()
{
return index;
}
/**
* Sets the panel index.
*
* @param index the index
*/
@Override
public void setIndex(int index)
{
this.index = index;
}
/**
* Returns the panel user interface.
*
* The view will be created if it doesn't exist.
*
* If the panel has a {@link DataValidator} specified, this will be constructed, with both the panel and view
* supplied for injection into it's constructor.
*
* @return the panel user interface
*/
@Override
public T getView()
{
if (view == null)
{
executePreConstructionActions();
view = createView(panel, viewClass);
List dataValidatorClassNames = panel.getValidators();
for (String dataValidatorClassName : dataValidatorClassNames)
{
validators.add(factory.create(dataValidatorClassName, DataValidator.class, panel, view));
}
addActions(panel.getPreActivationActions(), preActivationActions, ActionStage.preactivate);
addActions(panel.getPreValidationActions(), preValidationActions, ActionStage.prevalidate);
addActions(panel.getPostValidationActions(), postValidationActions, ActionStage.postvalidate);
initialise(view, panel, installData);
}
return view;
}
/**
* Sets the visibility of the panel.
*
* @param visible if {@code true} the panel is visible, otherwise it is hidden
*/
@Override
public void setVisible(boolean visible)
{
this.visible = visible;
}
/**
* Determines the visibility of the panel.
*
* @return {@code true} if the panel is visible, {@code false} if it is hidden
*/
@Override
public boolean isVisible()
{
return visible;
}
/**
* Determines if the panel is valid. Dynamic variables are automatically refreshed.
*
* @return {@code true} if the panel is valid
*/
@Override
public boolean isValid()
{
return isValid(true);
}
/**
* Determines if the panel is valid.
*
* @param refreshVariables whether to refresh dynamic variables before validating
* @return {@code true} if the panel is valid
*/
@Override
public boolean isValid(boolean refreshVariables)
{
boolean result = false;
if (refreshVariables)
{
installData.getVariables().refresh();
}
executePreValidationActions();
List conditions = installData.getDynamicInstallerRequirements();
if (conditions == null || validateDynamicConditions())
{
result = validators.size() == 0 || validateData();
}
executePostValidationActions();
return result;
}
/**
* Save the contents of the panel into install data.
*/
@Override
public void saveData()
{
//Panel specific should be overwritten my the panel
}
/**
* Determines if the panel can be shown.
*
* @return {@code true} if the panel can be shown
*/
@Override
public boolean canShow()
{
boolean visible;
String panelId = panel.getPanelId();
installData.refreshVariables();
if (panel.hasCondition())
{
visible = installData.getRules().isConditionTrue(panel.getCondition());
logger.fine("Panel '" + getPanelId() + "' depending on condition '" + panel.getCondition() + "' " + (visible?"can be shown":"will be skipped"));
}
else
{
visible = installData.getRules().canShowPanel(panelId, installData.getVariables());
logger.fine("Panel '" + getPanelId() + "' " + (visible?"can be shown":"will be skipped"));
}
if (!visible && panel.isDisplayHidden())
{
visible = true;
logger.fine("Panel '" + getPanelId() + "' depending on displayHidden can be shown read-only");
}
if (!visible && panel.hasDisplayHiddenCondition())
{
visible = installData.getRules().isConditionTrue(panel.getDisplayHiddenCondition());
panel.setDisplayHidden(visible);
logger.fine("Panel '" + getPanelId() + "' depending on displayHiddenCondition '" + panel.getDisplayHiddenCondition() + "' " + (visible?"can be shown read-only":"will be skipped"));
}
if (visible)
{
if (!panel.isReadonly() && panel.hasReadonlyCondition())
{
boolean readonly = installData.getRules().isConditionTrue(panel.getReadonlyCondition());
panel.setReadonly(readonly);
logger.fine("Panel '" + getPanelId() + "' depending on readonlyCondition '" + panel.getReadonlyCondition() + "' " + (readonly?"is forcibly read-only":"is editable"));
}
}
return visible;
}
/**
* Executes actions prior to activating the panel.
*/
public void executePreActivationActions()
{
execute(preActivationActions);
}
/**
* Executes actions prior to validating the panel.
*/
public void executePreValidationActions()
{
execute(preValidationActions);
}
/**
* Executes actions after validating the panel.
*/
public void executePostValidationActions()
{
execute(postValidationActions);
}
/**
* Returns a handler to prompt the user.
*
* @return the handler
*/
protected abstract AbstractUIHandler getHandler();
/**
* Creates a new view.
*
* @param panel the panel to create the view for
* @param viewClass the view base class
* @return the new view
*/
protected T createView(Panel panel, Class viewClass)
{
return factory.create(panel.getClassName(), viewClass, panel, this);
}
/**
* Initialises the view.
*
* This implementation is a no-op.
*
* @param view the view to initialise
* @param panel the panel the view represents
* @param installData the installation data
*/
protected void initialise(T view, Panel panel, InstallData installData)
{
}
/**
* Validates dynamic conditions.
*
* @return {@code true} if there are no conditions, or conditions validate successfully
*/
protected boolean validateDynamicConditions()
{
boolean result = true;
try
{
for (DynamicInstallerRequirementValidator validator : installData.getDynamicInstallerRequirements())
{
if (!isValid(validator, installData))
{
result = false;
break;
}
}
}
catch (Throwable exception)
{
logger.log(Level.WARNING, "Panel " + getPanelId() + ": Could not validate dynamic conditions", exception);
result = false;
}
return result;
}
/**
* Evaluates the panel data validator.
*
* @return {@code true} if the validator evaluated successfully, or with a warning that the user chose to skip;
* otherwise {@code false}
*/
protected boolean validateData()
{
boolean result = true;
DataValidator[] validatorArray = validators.toArray(new DataValidator[] {});
for (int i = 0; i < validatorArray.length; i++)
{
DataValidator validator = validatorArray[i];
if (!isValid(validator, i, installData))
{
result = false;
break;
}
}
return result;
}
/**
* Evaluates a validator.
*
* If the validator returns a warning status, then a prompt will be displayed asking the user to skip the
* validation or not.
*
* @param validator the validator to evaluate
* @param index the index in the list of validators for finding its appropriate validator condition
* @param installData the installation data
* @return {@code true} if the validator evaluated successfully, or with a warning that the user chose to skip;
* otherwise {@code false}
*/
private boolean isValid(DataValidator validator, Integer index, InstallData installData)
{
String dataValidatorConditionId = panel.getValidatorCondition(index);
if (dataValidatorConditionId != null)
{
Condition dataValidatorCondition = installData.getRules().getCondition(dataValidatorConditionId);
if (!dataValidatorCondition.isTrue())
{
// Skip panel validation
logger.fine("Panel " + getPanelId() + ": Skip validation (" + validator.getClass().getName() +")");
return true;
}
}
return isValid(validator, installData);
}
/**
* Evaluates a validator.
*
* If the validator returns a warning status, then a prompt will be displayed asking the user to skip the
* validation or not.
*
* @param validator the validator to evaluate
* @param index the index in the list of validators for finding its appropriate validator condition
* @param installData the installation data
* @return {@code true} if the validator evaluated successfully, or with a warning that the user chose to skip;
* otherwise {@code false}
*/
private boolean isValid(DataValidator validator, InstallData installData)
{
boolean result = false;
DataValidator.Status status = validator.validateData(installData);
logger.fine("Panel " + getPanelId() + ": Data validation status=" + status + " (" + validator.getClass().getName() + ")");
if (status == DataValidator.Status.OK)
{
result = true;
}
else
{
if (status == DataValidator.Status.WARNING)
{
String message = getMessage(validator.getWarningMessageId(), true);
if (message == null)
{
logger.warning("Panel " + getPanelId() + ": No warning message for validator " + validator.getClass().getName());
}
result = isWarningValid(message, validator.getDefaultAnswer());
}
else
{
String message = getMessage(validator.getErrorMessageId(), true);
if (message == null)
{
logger.warning("Panel " + getPanelId() + ": No error message for validator " + validator.getClass().getName());
message = "Validation error";
}
getHandler().emitError(getMessage("data.validation.error.title"), message);
}
}
return result;
}
/**
* Determines the behaviour when a warning is encountered during validation.
*
* @param message the validation message. May be {@code null}
* @param defaultAnswer the default response for warnings
* @return {@code true} if the warning doesn't invalidate the panel; {@code false} if it does
*/
protected boolean isWarningValid(String message, boolean defaultAnswer)
{
boolean result = false;
if (message != null)
{
if (getHandler().emitWarning(getMessage("data.validation.warning.title"), message))
{
result = true;
logger.fine("Panel " + getPanelId() + ": User decided to skip validation warning");
}
}
else
{
logger.fine("Panel " + getPanelId() + ": No warning message available, using default answer=" + defaultAnswer);
result = defaultAnswer;
}
return result;
}
/**
* Returns the factory.
*
* @return the factory
*/
protected ObjectFactory getFactory()
{
return factory;
}
/**
* Helper to return a localised message, given its id.
*
* @param id the message identifier
* @return the corresponding message or {@code null} if none is found
*/
protected String getMessage(String id)
{
return getMessage(id, false);
}
/**
* Executes actions.
*
* @param actions the actions to execute
*/
private void execute(List actions)
{
AbstractUIHandler handler = getHandler();
for (PanelAction action : actions)
{
action.executeAction(installData, handler);
}
}
/**
* Executes actions prior to creating the panel.
*
* Both the panel and view are supplied for injection into the action's constructor.
*/
private void executePreConstructionActions()
{
List configurations = panel.getPreConstructionActions();
if (configurations != null)
{
for (PanelActionConfiguration config : configurations)
{
PanelAction action = factory.create(config.getActionClassName(), PanelAction.class, panel,
ActionStage.preconstruct);
action.initialize(config);
action.executeAction(installData, null);
}
}
}
/**
* Creates {@link PanelAction}s, adding them to the supplied list.
*
* Both the panel and view are supplied for injection into the action's constructor.
*
* @param configurations the action class names. May be {@code null}
* @param actions the actions to add to
* @param stage the action stage
*/
private void addActions(List configurations, List actions,
ActionStage stage)
{
if (configurations != null)
{
for (PanelActionConfiguration config : configurations)
{
PanelAction action = factory.create(config.getActionClassName(), PanelAction.class, panel, view,
stage);
action.initialize(config);
actions.add(action);
}
}
}
/**
* Helper to return a localised message, given its id.
*
* @param id the message identifier
* @param replace if {@code true}, replace any variables in the message with their corresponding values
* @return the corresponding message or {@code null} if none is found
*/
private String getMessage(String id, boolean replace)
{
String message = null;
if (id != null)
{
Messages messages = installData.getMessages();
message = messages.get(id);
if (replace)
{
message = installData.getVariables().replace(message);
}
}
return message;
}
/**
* Creates an empty root element prepared for adding auto-installation records for this panel.
*
* @return IXMLElement The prepared panel record XML
*/
protected final IXMLElement createPanelRootRecord()
{
IXMLElement panelRoot = new XMLElementImpl(panel.getClassName(), installData.getInstallationRecord());
String panelId = panel.getPanelId();
if (panelId != null)
{
panelRoot.setAttribute(AutomatedInstallData.AUTOINSTALL_PANELROOT_ATTR_ID, panelId);
}
return panelRoot;
}
}
