JsfTagUtils.java

/**
 * Copyright © 2002 Instituto Superior Técnico
 *
 * This file is part of FenixEdu Academic.
 *
 * FenixEdu Academic is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FenixEdu Academic is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with FenixEdu Academic.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fenixedu.academic.ui.faces.components.util;

import java.io.Serializable;

import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.MethodBinding;
import javax.faces.el.ValueBinding;
import javax.faces.event.ActionEvent;
import javax.faces.event.ValueChangeEvent;
import javax.faces.webapp.UIComponentTag;

public class JsfTagUtils {
    public static void setString(UIComponent component, String attributeName, String attributeValue) {
        if (attributeValue == null) {
            return;
        } else if (UIComponentTag.isValueReference(attributeValue)) {
            setValueBinding(component, attributeName, attributeValue);
        } else {
            component.getAttributes().put(attributeName, attributeValue);
        }

    }

    public static void setInteger(UIComponent component, String attributeName, String attributeValue) {
        if (attributeValue == null) {
            return;
        } else if (UIComponentTag.isValueReference(attributeValue)) {
            setValueBinding(component, attributeName, attributeValue);
        } else {
            component.getAttributes().put(attributeName, Integer.valueOf(attributeValue));
        }

    }

    public static void setBoolean(UIComponent component, String attributeName, String attributeValue) {
        if (attributeValue == null) {
            return;
        } else if (UIComponentTag.isValueReference(attributeValue)) {
            setValueBinding(component, attributeName, attributeValue);
        } else {
            component.getAttributes().put(attributeName, Boolean.valueOf(attributeValue));
        }

    }

    public static void setValueBinding(UIComponent component, String attributeName, String attributeValue) {
        FacesContext context = FacesContext.getCurrentInstance();
        Application application = context.getApplication();
        ValueBinding valueBinding = application.createValueBinding(attributeValue);

        component.setValueBinding(attributeName, valueBinding);
    }

    public static void setMethodBinding(UIComponent component, String attributeName, String attributeValue, Class[] paramTypes) {
        if (attributeValue == null) {
            return;
        }

        if (UIComponentTag.isValueReference(attributeValue)) {
            FacesContext context = FacesContext.getCurrentInstance();
            Application application = context.getApplication();
            MethodBinding methodBinding = application.createMethodBinding(attributeValue, paramTypes);
            component.getAttributes().put(attributeName, methodBinding);
        }
    }

    public static void setAction(UIComponent component, String attributeValue) {
        if (attributeValue == null) {
            return;
        }

        if (UIComponentTag.isValueReference(attributeValue)) {
            MethodBinding methodBinding = new ActionMethodBinding(attributeValue);
            component.getAttributes().put("action", methodBinding);

        } else {
            setString(component, "action", attributeValue);
        }
    }

    public static void setValueChangeListener(UIComponent component, String attributeValue) {
        setMethodBinding(component, "valueChangeListener", attributeValue, new Class[] { ValueChangeEvent.class });
    }

    public static void setValidator(UIComponent component, String attributeValue) {
        setMethodBinding(component, "validator", attributeValue, new Class[] { FacesContext.class, UIComponent.class,
                Object.class });
    }

    public static void setActionListener(UIComponent component, String attributeValue) {
        setMethodBinding(component, "actionListener", attributeValue, new Class[] { ActionEvent.class });
    }

    private static class ActionMethodBinding extends MethodBinding implements Serializable {
        /**
         * 
         */
        private static final long serialVersionUID = -3737332393091493840L;

        private String result;

        public ActionMethodBinding(String result) {
            this.result = result;
        }

        @Override
        public Object invoke(FacesContext context, Object params[]) {
            return result;
        }

        @Override
        public String getExpressionString() {
            return result;
        }

        @Override
        public Class getType(FacesContext context) {
            return String.class;
        }
    }

}