org.primefaces.expression.impl.WidgetVarExpressionResolver 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.expression.impl;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.visit.VisitContext;
import javax.faces.context.FacesContext;
import org.primefaces.expression.ClientIdSearchExpressionResolver;
import org.primefaces.expression.SearchExpressionResolver;
/**
* {@link SearchExpressionResolver} for the "@widgetVar" keyword.
*/
public class WidgetVarExpressionResolver implements SearchExpressionResolver, ClientIdSearchExpressionResolver {
private static final Pattern PATTERN = Pattern.compile("@widgetVar\\((\\w+)\\)");
public UIComponent resolveComponent(FacesContext context, UIComponent source, UIComponent last, String expression) {
try {
Matcher matcher = PATTERN.matcher(expression);
if (matcher.matches()) {
WidgetVarVisitCallback visitCallback = new WidgetVarVisitCallback(matcher.group(1));
context.getViewRoot().visitTree(VisitContext.createVisitContext(context), visitCallback);
return visitCallback.getComponent();
} else {
throw new FacesException("Expression does not match following pattern @widgetVar(var). Expression: \"" + expression + "\"");
}
} catch (Exception e) {
throw new FacesException("Expression does not match following pattern @widgetVar(var). Expression: \"" + expression + "\"", e);
}
}
public String resolveClientIds(FacesContext context, UIComponent source, UIComponent last, String expression) {
// just return the complete expression, the client side will take care of it
// e.g. @widgetVar(myWidget)
return expression;
}
}