/**
* Copyright 2005-2016 hdiv.org
*
* 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 org.hdiv.components;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import javax.faces.component.UIComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.component.UIParameter;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import org.hdiv.state.StateManager;
import org.hdiv.util.ConstantsJsf;
import org.hdiv.util.HDIVUtil;
/**
* <p>
* UIParameter component extension.
* </p>
* <p>
* This component is used to define the parameters of CommandLink and OutputLink. It stores the real values as component's attributes, in
* the JSF state.
* </p>
* <p>
* Next request will be validated against the stored data.
* </p>
* @author Gotzon Illarramendi
*/
public class UIParameterExtension extends UIParameter {
/**
* Returns the values of the parameter for the requested row in the dataTable
*
* @param context {@link FacesContext}
* @param parentClientId Parent ClientId
* @return parameter values
*/
public Collection<Object> getStateValue(final FacesContext context, final String parentClientId) {
Object val = getValue();
// If it has previously been stored in the state, return the stored value else return the default
StateManager stateManager = getStateManager(context);
if (stateManager != null) {
Collection<Object> values = stateManager.restoreState(parentClientId + UINamingContainer.getSeparatorChar(context) + getName());
if (values != null && values.size() > 0) {
return values;
}
}
return Collections.singletonList(val);
}
/*
* (non-Javadoc)
*
* @see javax.faces.component.UIComponent#encodeBegin(javax.faces.context. FacesContext)
*/
@Override
public void encodeBegin(final FacesContext context) throws IOException {
// HDIV parameter name
HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
String hdivParameter = HDIVUtil.getRequestContext(request).getHdivParameterName();
String name = getName();
if (name != null && name.equals(hdivParameter)) {
// It is the Hdiv parameter added automatically by the link, so do nothing
}
else {
UIComponent parent = getParent();
String parentClientId = parent.getClientId(context);
// It is a parameter added by the application, so store its value in the JSF state to be able to validate it in future requests.
Object val = getValue();
StateManager stateManager = getStateManager(context);
if (stateManager != null) {
String id = parentClientId + UINamingContainer.getSeparatorChar(context) + name;
stateManager.saveState(id, val);
}
}
super.encodeBegin(context);
}
protected StateManager getStateManager(final FacesContext context) {
StateManager stateManager = (StateManager) context.getExternalContext().getRequestMap()
.get(ConstantsJsf.HDIV_STATE_MANAGER_ATTRIBUTE_KEY);
return stateManager;
}
}