org.primefaces.facelets.MethodRule Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of primefaces Show documentation

PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

There is a newer version: 14.0.0-RC3

Show newest version

/**
 * The MIT License
 *
 * Copyright (c) 2009-2019 PrimeTek
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.primefaces.facelets;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import javax.el.MethodExpression;
import javax.faces.FacesException;

import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.MetaRule;
import javax.faces.view.facelets.Metadata;
import javax.faces.view.facelets.MetadataTarget;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributeException;

/**
 * Optional Rule for binding Method[Binding|Expression] properties
 *
 * @author Mike Kienenberger
 * @author Jacob Hookom
 *
 * Implementation copied from Facelets 1.1.14, as it got hidden by JSF 2.0
 */
public class MethodRule extends MetaRule {

    private final String methodName;
    private final Class returnTypeClass;
    private final Class[] params;

    public MethodRule(String methodName, Class returnTypeClass, Class[] params) {
        this.methodName = methodName;
        this.returnTypeClass = returnTypeClass;
        this.params = params;
    }

    @Override
    public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta) {
        if (false == name.equals(this.methodName)) {
            return null;
        }

        Class type = meta.getPropertyType(name);

        if (MethodExpression.class.equals(type)) {
            Method method = meta.getWriteMethod(name);
            if (method != null) {
                return new MethodExpressionMetadata(method, attribute, this.returnTypeClass, this.params);
            }
        }
        else if (type != null && "javax.faces.el.MethodBinding".equals(type.getName())) {
            throw new FacesException("javax.faces.el.MethodBinding should not be used anymore!");
        }

        return null;
    }

    private static class MethodExpressionMetadata extends Metadata {

        private final Method method;
        private final TagAttribute attribute;
        private final Class[] paramList;
        private final Class returnType;

        public MethodExpressionMetadata(Method method, TagAttribute attribute, Class returnType, Class[] paramList) {
            this.method = method;
            this.attribute = attribute;
            this.paramList = paramList;
            this.returnType = returnType;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            MethodExpression expr = this.attribute.getMethodExpression(ctx, this.returnType, this.paramList);

            try {
                this.method.invoke(instance, new Object[]{expr});
            }
            catch (InvocationTargetException e) {
                throw new TagAttributeException(this.attribute, e.getCause());
            }
            catch (Exception e) {
                throw new TagAttributeException(this.attribute, e);
            }
        }
    }

}