JSF分页组件

package com.corejsf.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 Tags { public static void setString(UIComponent component, String attributeName, String attributeValue) { if (attributeValue == null) return; 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; if (UIComponentTag.isValueReference(attributeValue)) setValueBinding(component, attributeName, attributeValue); else component.getAttributes().put(attributeName, new Integer(attributeValue)); } public static void setDouble(UIComponent component, String attributeName, String attributeValue) { if (attributeValue == null) return; if (UIComponentTag.isValueReference(attributeValue)) setValueBinding(component, attributeName, attributeValue); else component.getAttributes().put(attributeName, new Double(attributeValue)); } public static void setBoolean(UIComponent component, String attributeName, String attributeValue) { if (attributeValue == null) return; if (UIComponentTag.isValueReference(attributeValue)) setValueBinding(component, attributeName, attributeValue); else component.getAttributes().put(attributeName, new Boolean(attributeValue)); } public static void setValueBinding(UIComponent component, String attributeName, String attributeValue) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); ValueBinding vb = app.createValueBinding(attributeValue); component.setValueBinding(attributeName, vb); } public static void setActionListener(UIComponent component, String attributeValue) { setMethodBinding(component, "actionListener", attributeValue, new Class[] { ActionEvent.class }); } 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 setAction(UIComponent component, String attributeValue) { if (attributeValue == null) return; if (UIComponentTag.isValueReference(attributeValue)) setMethodBinding(component, "action", attributeValue, new Class[] {}); else { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); MethodBinding mb = new ActionMethodBinding(attributeValue); component.getAttributes().put("action", mb); } } 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 app = context.getApplication(); MethodBinding mb = app.createMethodBinding(attributeValue, paramTypes); component.getAttributes().put(attributeName, mb); } } public static String eval(String expression) { if (expression == null) return null; if (UIComponentTag.isValueReference(expression)) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); return "" + app.createValueBinding(expression).getValue(context); } else return expression; } public static Integer evalInteger(String expression) { if (expression == null) return null; if (UIComponentTag.isValueReference(expression)) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); Object r = app.createValueBinding(expression).getValue(context); if (r == null) return null; else if (r instanceof Integer) return (Integer) r; else return new Integer(r.toString()); } else return new Integer(expression); } public static Double evalDouble(String expression) { if (expression == null) return null; if (UIComponentTag.isValueReference(expression)) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); Object r = app.createValueBinding(expression).getValue(context); if (r == null) return null; else if (r instanceof Double) return (Double) r; else return new Double(r.toString()); } else return new Double(expression); } public static Boolean evalBoolean(String expression) { if (expression == null) return null; if (UIComponentTag.isValueReference(expression)) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); Object r = app.createValueBinding(expression).getValue(context); if (r == null) return null; else if (r instanceof Boolean) return (Boolean) r; else return new Boolean(r.toString()); } else return new Boolean(expression); } private static class ActionMethodBinding extends MethodBinding implements Serializable { private String result; public ActionMethodBinding(String result) { this.result = result; } public Object invoke(FacesContext context, Object params[]) { return result; } public String getExpressionString() { return result; } public Class getType(FacesContext context) { return String.class; } } }