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org.butterfaces.component.base.renderer.HtmlBasicRenderer Maven / Gradle / Ivy
package org.butterfaces.component.base.renderer;
import org.butterfaces.component.behavior.JsfAjaxRequest;
import org.butterfaces.component.html.feature.Readonly;
import org.butterfaces.resolver.ClientBehaviorResolver;
import org.butterfaces.util.StringUtils;
import javax.faces.component.*;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.convert.Converter;
import javax.faces.render.Renderer;
import java.io.IOException;
import java.util.*;
/**
* Basic butterfaces renderer.
*/
public class HtmlBasicRenderer extends Renderer {
public static final String ELEMENT_DIV = "div";
public static final String ELEMENT_SPAN = "span";
public static final String ELEMENT_SECTION = "section";
public static final String ATTRIBUTE_ID = "id";
public static final String ATTRIBUTE_STYLE = "style";
public static final String ATTRIBUTE_CLASS = "class";
public static final String ATTRIBUTE_PLACEHOLDER = "placeholder";
@Override
public void encodeChildren(final FacesContext context,
final UIComponent component) throws IOException {
if (!component.isRendered()) {
return;
}
if (component.getChildCount() > 0) {
for (UIComponent child : component.getChildren()) {
encodeRecursive(context, child);
}
}
}
@Override
public void encodeEnd(final FacesContext context,
final UIComponent component) throws IOException {
if (!component.isRendered()) {
return;
}
getEndTextToRender(context, component, getCurrentValue(context, component));
}
/**
* @param component Component from which to return a facet
* @param name Name of the desired facet
* @return the specified facet from the specified component, but
* only if its rendered property is
* set to true.
*/
protected UIComponent getFacet(UIComponent component, String name) {
final UIComponent facet = component.getFacet(name);
return facet != null && facet.isRendered() ? facet : null;
}
@Override
public void decode(final FacesContext context,
final UIComponent component) {
if (!component.isRendered() || ((component instanceof Readonly) && ((Readonly) component).isReadonly())) {
return;
}
if (!(component instanceof UIInput)) {
return;
}
String clientId = decodeBehaviors(context, component);
if (clientId == null) {
clientId = component.getClientId(context);
}
setSubmittedValue(component, context.getExternalContext().getRequestParameterMap().get(clientId));
}
protected final String decodeBehaviors(final FacesContext context,
final UIComponent component) {
if (!(component instanceof ClientBehaviorHolder)) {
return null;
}
final ClientBehaviorHolder holder = (ClientBehaviorHolder) component;
final Map> behaviors = holder.getClientBehaviors();
if (behaviors.isEmpty()) {
return null;
}
final ExternalContext external = context.getExternalContext();
final Map params = external.getRequestParameterMap();
final String behaviorEvent = params.get("javax.faces.behavior.event");
if (behaviorEvent != null) {
final List behaviorsForEvent = behaviors.get(behaviorEvent);
if (behaviorsForEvent != null && behaviorsForEvent.size() > 0) {
final String behaviorSource = params.get("javax.faces.source");
final String clientId = component.getClientId();
if (isBehaviorSource(behaviorSource, clientId)) {
for (ClientBehavior behavior : behaviorsForEvent) {
behavior.decode(context, component);
}
}
return clientId;
}
}
return null;
}
protected void setSubmittedValue(final UIComponent component,
final Object value) {
if (component instanceof UIInput) {
((UIInput) component).setSubmittedValue(value);
}
}
/**
* Render boolean value if attribute is set to true.
*
* @param attributeName attribute name
* @param component the component
* @param writer html response writer
* @throws IOException thrown by writer
*/
protected void renderBooleanValue(final UIComponent component,
final ResponseWriter writer,
final String attributeName) throws IOException {
if (component.getAttributes().get(attributeName) != null && Boolean.valueOf(component.getAttributes().get(attributeName).toString())) {
writer.writeAttribute(attributeName, true, attributeName);
}
}
/**
* Render string value if attribute is not empty.
*
* @param attributeName attribute name
* @param component the component
* @param writer html response writer
* @throws IOException thrown by writer
*/
protected void renderStringValue(final UIComponent component,
final ResponseWriter writer,
final String attributeName) throws IOException {
if (component.getAttributes().get(attributeName) != null
&& StringUtils.isNotEmpty(component.getAttributes().get(attributeName).toString())
&& shouldRenderAttribute(component.getAttributes().get(attributeName))) {
writer.writeAttribute(attributeName, component.getAttributes().get(attributeName).toString().trim(), attributeName);
}
}
/**
* Render string value if attribute is equals to matching value.
*
* @param attributeName attribute name
* @param component the component
* @param writer html response writer
* @param matchingValue matchingValue
* @throws IOException thrown by writer
*/
protected void renderStringValue(final UIComponent component,
final ResponseWriter writer,
final String attributeName,
final String matchingValue) throws IOException {
if (component.getAttributes().get(attributeName) != null
&& matchingValue.equalsIgnoreCase(component.getAttributes().get(attributeName).toString())
&& shouldRenderAttribute(component.getAttributes().get(attributeName))) {
writer.writeAttribute(attributeName, matchingValue, attributeName);
}
}
protected void renderEventValue(final UIComponent component,
final ResponseWriter writer,
final String attributeName,
final String eventName) throws IOException {
final Optional componentEventFunction = createComponentEventFunction(component, attributeName);
final Optional ajaxEventFunction = createAjaxEventFunction((UIComponentBase) component, eventName);
if (componentEventFunction.isPresent() && ajaxEventFunction.isPresent()) {
writer.writeAttribute(attributeName, ajaxEventFunction.get() + ";" + componentEventFunction.get(), null);
} else if (componentEventFunction.isPresent()) {
writer.writeAttribute(attributeName, componentEventFunction.get(), null);
} else if (ajaxEventFunction.isPresent()) {
writer.writeAttribute(attributeName, ajaxEventFunction.get(), null);
}
}
private boolean isBehaviorSource(final String behaviorSourceId,
final String componentClientId) {
return (behaviorSourceId != null && behaviorSourceId.equals(componentClientId));
}
private String getCurrentValue(FacesContext context, final UIComponent component) {
if (component instanceof UIInput) {
Object submittedValue = ((UIInput) component).getSubmittedValue();
if (submittedValue != null) {
// value may not be a String...
return submittedValue.toString();
}
}
if (component instanceof ValueHolder) {
final ValueHolder valueHolder = (ValueHolder) component;
final Object value = valueHolder.getValue();
final Converter converter = valueHolder.getConverter();
if (converter != null && value != null) {
return converter.getAsString(context, component, value);
}
if (value != null) {
return value.toString();
}
}
return null;
}
protected void getEndTextToRender(final FacesContext context,
final UIComponent component,
final String currentValue) throws IOException {
// no-op unless overridden
}
private boolean shouldRenderAttribute(Object value) {
if (value == null)
return false;
if (value instanceof Boolean) {
return (Boolean) value;
} else if (value instanceof Number) {
final Number number = (Number) value;
if (value instanceof Integer)
return number.intValue() != Integer.MIN_VALUE;
else if (value instanceof Double)
return number.doubleValue() != Double.MIN_VALUE;
else if (value instanceof Long)
return number.longValue() != Long.MIN_VALUE;
else if (value instanceof Byte)
return number.byteValue() != Byte.MIN_VALUE;
else if (value instanceof Float)
return number.floatValue() != Float.MIN_VALUE;
else if (value instanceof Short)
return number.shortValue() != Short.MIN_VALUE;
}
return true;
}
protected String writeIdAttributeIfNecessary(final FacesContext context,
final ResponseWriter writer,
final UIComponent component) throws IOException {
if (shouldWriteIdAttribute(component)) {
return this.writeIdAttribute(context, writer, component);
}
return null;
}
protected String writeIdAttribute(final FacesContext context,
final ResponseWriter writer,
final UIComponent component) throws IOException {
final String clientId = component.getClientId(context);
writer.writeAttribute(ATTRIBUTE_ID, clientId, ATTRIBUTE_ID);
return clientId;
}
protected boolean shouldWriteIdAttribute(UIComponent component) {
String id;
return (null != (id = component.getId()) &&
(!id.startsWith(UIViewRoot.UNIQUE_ID_PREFIX) ||
((component instanceof ClientBehaviorHolder) &&
!((ClientBehaviorHolder) component).getClientBehaviors().isEmpty())));
}
protected void encodeRecursive(final FacesContext context,
final UIComponent component) throws IOException {
if (!component.isRendered()) {
return;
}
component.encodeBegin(context);
if (component.getRendersChildren()) {
component.encodeChildren(context);
} else {
final Iterator childComponentsIterator = getChildren(component);
while (childComponentsIterator.hasNext()) {
encodeRecursive(context, childComponentsIterator.next());
}
}
component.encodeEnd(context);
}
protected Iterator getChildren(UIComponent component) {
if (component.getChildCount() > 0) {
return component.getChildren().iterator();
} else {
return Collections.emptyIterator();
}
}
protected Optional createComponentEventFunction(UIComponent component, String attributeName) {
return component.getAttributes().get(attributeName) instanceof String
? Optional.of((String) component.getAttributes().get(attributeName))
: Optional.empty();
}
protected Optional createAjaxEventFunction(UIComponentBase component, String eventName) {
return ClientBehaviorResolver.findFirstActiveAjaxBehavior(component, eventName)
.map(behavior -> new JsfAjaxRequest(component, behavior, eventName).toString());
}
}
