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org.primefaces.component.outputlabel.OutputLabelRenderer Maven / Gradle / Ivy
/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.component.outputlabel;
import org.primefaces.util.EditableValueHolderState;
import java.io.IOException;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.PropertyNotFoundException;
import javax.el.ValueExpression;
import javax.faces.component.ContextCallback;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.validation.constraints.NotNull;
import javax.validation.metadata.ConstraintDescriptor;
import org.primefaces.component.api.InputHolder;
import org.primefaces.config.PrimeConfiguration;
import org.primefaces.context.RequestContext;
import org.primefaces.el.ValueExpressionAnalyzer;
import org.primefaces.expression.SearchExpressionFacade;
import org.primefaces.metadata.BeanValidationMetadataExtractor;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.ComponentUtils;
import org.primefaces.util.CompositeUtils;
import org.primefaces.util.HTML;
import org.primefaces.util.SharedStringBuilder;
public class OutputLabelRenderer extends CoreRenderer {
private static final Logger LOG = Logger.getLogger(OutputLabelRenderer.class.getName());
private static final String SB_STYLE_CLASS = OutputLabelRenderer.class.getName() + "#styleClass";
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
final ResponseWriter writer = context.getResponseWriter();
final OutputLabel label = (OutputLabel) component;
final String clientId = label.getClientId(context);
final String value = ComponentUtils.getValueToRender(context, label);
final StringBuilder styleClass = SharedStringBuilder.get(context, SB_STYLE_CLASS);
styleClass.append(OutputLabel.STYLE_CLASS);
if (label.getStyleClass() != null) {
styleClass.append(" ");
styleClass.append(label.getStyleClass());
}
final EditableValueHolderState state = new EditableValueHolderState();;
String _for = label.getFor();
if (!isValueBlank(_for)) {
ContextCallback callback = new ContextCallback() {
@Override
public void invokeContextCallback(FacesContext context, UIComponent target) {
if (target instanceof InputHolder) {
InputHolder inputHolder = ((InputHolder) target);
state.setClientId(inputHolder.getInputClientId());
inputHolder.setLabelledBy(clientId);
}
else {
state.setClientId(target.getClientId(context));
}
if (target instanceof UIInput) {
UIInput input = (UIInput) target;
if (value != null && (input.getAttributes().get("label") == null || input.getValueExpression("label") == null)) {
ValueExpression ve = label.getValueExpression("value");
if(ve != null) {
input.setValueExpression("label", ve);
}
else {
String labelString = value;
int colonPos = labelString.lastIndexOf(':');
if(colonPos != -1) {
labelString = labelString.substring(0, colonPos);
}
input.getAttributes().put("label", labelString);
}
}
if (!input.isValid()) {
styleClass.append(" ui-state-error");
}
if (label.isIndicateRequired()) {
state.setRequired(input.isRequired());
// fallback if required=false
if (!state.isRequired()) {
PrimeConfiguration config = RequestContext.getCurrentInstance().getApplicationContext().getConfig();
if (config.isBeanValidationAvailable() && isNotNullDefined(input, context)) {
state.setRequired(true);
}
}
}
}
}
};
UIComponent forComponent = SearchExpressionFacade.resolveComponent(context, label, _for);
if (CompositeUtils.isComposite(forComponent)) {
CompositeUtils.invokeOnDeepestEditableValueHolder(context, forComponent, callback);
}
else {
callback.invokeContextCallback(context, forComponent);
}
}
writer.startElement("label", label);
writer.writeAttribute("id", clientId, "id");
writer.writeAttribute("class", styleClass.toString(), "id");
renderPassThruAttributes(context, label, HTML.LABEL_ATTRS);
if (!isValueBlank(_for)) {
writer.writeAttribute("for", state.getClientId(), "for");
}
if (value != null) {
if (label.isEscape()) {
writer.writeText(value, "value");
}
else {
writer.write(value);
}
}
renderChildren(context, label);
if (!isValueBlank(_for) && label.isIndicateRequired() && state.isRequired()) {
encodeRequiredIndicator(writer, label);
}
writer.endElement("label");
}
protected void encodeRequiredIndicator(ResponseWriter writer, OutputLabel label) throws IOException {
writer.startElement("span", label);
writer.writeAttribute("class", OutputLabel.REQUIRED_FIELD_INDICATOR_CLASS, null);
writer.write("*");
writer.endElement("span");
}
protected boolean isNotNullDefined(UIInput input, FacesContext context) {
// skip @NotNull check
// see GitHub #14
if (!RequestContext.getCurrentInstance().getApplicationContext().getConfig().isInterpretEmptyStringAsNull()) {
return false;
}
try {
Set> constraints = BeanValidationMetadataExtractor.extractDefaultConstraintDescriptors(
context, RequestContext.getCurrentInstance(), ValueExpressionAnalyzer.getExpression(context.getELContext(), input.getValueExpression("value")));
if (constraints != null && !constraints.isEmpty()) {
for (ConstraintDescriptor constraintDescriptor : constraints) {
if (constraintDescriptor.getAnnotation().annotationType().equals(NotNull.class)) {
return true;
}
}
}
}
catch (PropertyNotFoundException e) {
String message = "Skip evaluating @NotNull for outputLabel and referenced component \"" + input.getClientId(context) + "\" because"
+ " the ValueExpression of the \"value\" attribute"
+ " isn't resolvable completely (e.g. a sub-expression returns null)";
LOG.log(Level.FINE, message);
}
return false;
}
@Override
public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
//Do nothing
}
@Override
public boolean getRendersChildren() {
return true;
}
}
