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package com.sun.faces.facelets.tag.jsf;
import com.sun.faces.component.validator.ComponentValidators;
import com.sun.faces.facelets.tag.MetaRulesetImpl;
import com.sun.faces.util.Util;
import com.sun.faces.util.RequestStateManager;
import javax.el.ValueExpression;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.view.AttachedObjectHandler;
import javax.faces.view.facelets.*;
import java.io.IOException;
import java.util.Set;
import java.util.HashSet;
public class ValidatorTagHandlerDelegateImpl extends TagHandlerDelegate implements AttachedObjectHandler {
protected final ValidatorHandler owner;
private final boolean wrapping;
// ------------------------------------------------------------ Constructors
public ValidatorTagHandlerDelegateImpl(ValidatorHandler owner) {
this.owner = owner;
wrapping = isWrapping();
}
// ----------------------------------------- Methods from TagHandlerDelegate
@Override
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException {
ComponentSupport.copyPassthroughAttributes(ctx, parent, owner.getTag());
if (wrapping) {
applyWrapping(ctx, parent);
} else {
applyNested(ctx, parent);
}
}
@Override
public MetaRuleset createMetaRuleset(Class type) {
Util.notNull("type", type);
MetaRuleset m = new MetaRulesetImpl(owner.getTag(), type);
return m.ignore("binding").ignore("disabled").ignore("for");
}
// -------------------------------------- Methods from AttachedObjectHandler
@SuppressWarnings({"unchecked"})
public void applyAttachedObject(FacesContext context, UIComponent parent) {
FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
EditableValueHolder evh = (EditableValueHolder) parent;
if (owner.isDisabled(ctx)) {
Set<String> disabledIds = (Set<String>)
RequestStateManager.get(context, RequestStateManager.DISABLED_VALIDATORS);
if (disabledIds == null) {
disabledIds = new HashSet<String>(3);
RequestStateManager.set(context,
RequestStateManager.DISABLED_VALIDATORS,
disabledIds);
}
disabledIds.add(owner.getValidatorId(ctx));
return;
}
ValueExpression ve = null;
Validator v = null;
if (owner.getBinding() != null) {
ve = owner.getBinding().getValueExpression(ctx, Validator.class);
v = (Validator) ve.getValue(ctx);
}
if (v == null) {
v = this.createValidator(ctx);
if (ve != null) {
ve.setValue(ctx, v);
}
}
if (v == null) {
throw new TagException(owner.getTag(), "No Validator was created");
}
owner.setAttributes(ctx, v);
evh.addValidator(v);
}
public String getFor() {
String result = null;
TagAttribute attr = owner.getTagAttribute("for");
if (null != attr) {
if (attr.isLiteral()) {
result = attr.getValue();
} else {
FacesContext context = FacesContext.getCurrentInstance();
FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
result = (String)attr.getValueExpression(ctx, String.class).getValue(ctx);
}
}
return result;
}
// ------------------------------------------------------- Protected Methods
protected ComponentValidators.ValidatorInfo createValidatorInfo(FaceletContext ctx) {
return new ComponentValidators.ValidatorInfo(ctx, owner);
}
// --------------------------------------------------------- Private Methods
// Tests whether the valiator tag is wrapping other tags.
private boolean isWrapping() {
// Would be nice if there was some easy way to determine whether
// we are a leaf handler. However, even leaf handlers have a
// non-null nextHandler - the CompilationUnit.LEAF instance.
// We assume that if we've got a TagHandler or CompositeFaceletHandler
// as our nextHandler, we are not a leaf.
return ((owner.getValidatorConfig().getNextHandler() instanceof TagHandler) ||
(owner.getValidatorConfig().getNextHandler() instanceof CompositeFaceletHandler));
}
private void applyWrapping(FaceletContext ctx,
UIComponent parent) throws IOException {
ComponentValidators validators = ComponentValidators.getValidators(ctx.getFacesContext(), true);
validators.pushValidatorInfo(createValidatorInfo(ctx));
owner.getValidatorConfig().getNextHandler().apply(ctx, parent);
validators.popValidatorInfo();
}
private void applyNested(FaceletContext ctx,
UIComponent parent) {
// only process if it's been created
if (!ComponentHandler.isNew(parent)) {
return;
}
if (parent instanceof EditableValueHolder) {
applyAttachedObject(ctx.getFacesContext(), parent);
} else if (UIComponent.isCompositeComponent(parent)) {
if (null == owner.getFor()) {
// PENDING(): I18N
throw new TagException(owner.getTag(),
"validator tags nested within composite components must have a non-null \"for\" attribute");
}
// Allow the composite component to know about the target
// component.
CompositeComponentTagHandler.getAttachedObjectHandlers(parent).add(owner);
} else {
throw new TagException(owner.getTag(),
"Parent not an instance of EditableValueHolder: " + parent);
}
}
/**
* Template method for creating a Validator instance
*
* @param ctx
* FaceletContext to use
* @return a new Validator instance
*/
private Validator createValidator(FaceletContext ctx) {
String id = owner.getValidatorId(ctx);
if (id == null) {
throw new TagException(
owner.getTag(),
"A validator id was not specified. Typically the validator id is set in the constructor ValidateHandler(ValidatorConfig)");
}
return ctx.getFacesContext().getApplication().createValidator(id);
}
}