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org.zkoss.bind.impl.SaveFormBindingImpl Maven / Gradle / Ivy
/* SaveFormBindingImpl.java
Purpose:
Description:
History:
Aug 9, 2011 6:30:34 PM, Created by henrichen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.impl;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javassist.util.proxy.MethodHandler;
import javassist.util.proxy.Proxy;
import javassist.util.proxy.ProxyFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.zkoss.bind.BindContext;
import org.zkoss.bind.Binder;
import org.zkoss.bind.Form;
import org.zkoss.bind.FormLegacy;
import org.zkoss.bind.FormLegacyExt;
import org.zkoss.bind.FormStatus;
import org.zkoss.bind.Property;
import org.zkoss.bind.ValidationContext;
import org.zkoss.bind.Validator;
import org.zkoss.bind.proxy.FormProxyHandler;
import org.zkoss.bind.sys.BindEvaluatorX;
import org.zkoss.bind.sys.BinderCtrl;
import org.zkoss.bind.sys.ConditionType;
import org.zkoss.bind.sys.SaveFormBinding;
import org.zkoss.bind.sys.debugger.BindingExecutionInfoCollector;
import org.zkoss.bind.sys.debugger.impl.info.SaveInfo;
import org.zkoss.bind.sys.debugger.impl.info.ValidationInfo;
import org.zkoss.lang.reflect.Fields;
import org.zkoss.xel.ExpressionX;
import org.zkoss.xel.ValueReference;
import org.zkoss.zel.PropertyNotFoundException;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
/**
* Implementation of {@link SaveFormBinding}.
* @author henrichen
* @since 6.0.0
*/
public class SaveFormBindingImpl extends FormBindingImpl implements SaveFormBinding {
private static final Logger log = LoggerFactory.getLogger(SaveFormBindingImpl.class);
private static final long serialVersionUID = 1463169907348730644L;
private final ExpressionX _validator;
private final Map _validatorArgs;
private static final String VALUEREF = "$VALUEREF$";
public SaveFormBindingImpl(Binder binder, Component comp, String formId, String saveExpr,
ConditionType conditionType, String command, Map bindingArgs, String validatorExpr,
Map validatorArgs) {
super(binder, comp, formId, saveExpr, conditionType, command, bindingArgs);
final BindEvaluatorX eval = binder.getEvaluatorX();
_validator = validatorExpr == null ? null : parseValidator(eval, validatorExpr);
_validatorArgs = validatorArgs;
Form form = getFormBean();
if (form instanceof FormLegacy)
return;
// force to init Form for validation
getFormBean(BindContextUtil.newBindContext(binder, this, false, null, getComponent(), null));
}
public Map getValidatorArgs() {
return _validatorArgs;
}
protected boolean ignoreTracker() {
return true;
}
private ExpressionX parseValidator(BindEvaluatorX eval, String validatorExpr) {
// final BindContext ctx = BindContextUtil.newBindContext(getBinder(), this, false, null, getComponent(), null);
// ctx.setAttribute(BinderImpl.IGNORE_TRACKER, Boolean.TRUE);//ignore tracker when doing el, we don't need to trace validator
//don't provide a bindcontext when pare expression of validator with this binding,
//do so, the tracker will not also tracking the validator dependence with this binding.
return eval.parseExpressionX(null, validatorExpr, Object.class);
}
public Validator getValidator() {
if (_validator == null)
return null;
// final BindContext ctx = BindContextUtil.newBindContext(getBinder(), this, false, null, getComponent(), null);
// ctx.setAttribute(BinderImpl.IGNORE_TRACKER, Boolean.TRUE);//ignore tracker when doing el, we don't need to trace validator
final BindEvaluatorX eval = getBinder().getEvaluatorX();
Object obj = eval.getValue(/*ctx*/null, getComponent(), _validator);
if (obj instanceof Validator) {
return (Validator) obj;
} else if (obj instanceof String) {
return getBinder().getValidator((String) obj); //binder will throw exception if not found
} else {
throw new ClassCastException(
"result of expression '" + _validator.getExpressionString() + "' is not a Validator, is " + obj);
}
}
public Form getFormBean(BindContext ctx) {
Form form = getFormBean();
if (form == null) {
final Binder binder = getBinder();
final BindEvaluatorX eval = binder.getEvaluatorX();
final Component comp = getComponent();
final Object bean = eval.getValue(ctx, comp, _accessInfo.getProperty());
form = initFormBean(bean, (Class) (bean == null ? eval.getType(ctx, comp, _accessInfo.getProperty())
: bean.getClass()), ctx);
}
return form;
}
public void save(BindContext ctx) {
final Binder binder = getBinder();
final Component comp = getComponent(); //ctx.getComponent();
final Form form = getFormBean(ctx);
BindingExecutionInfoCollector collector = ((BinderCtrl) getBinder()).getBindingExecutionInfoCollector();
//update form field into backing bean
if (form instanceof FormLegacy) {
if (form instanceof FormLegacyExt) {
final BindEvaluatorX eval = binder.getEvaluatorX();
for (String field : ((FormLegacyExt) form).getSaveFieldNames()) {
final ExpressionX expr = getFieldExpression(eval, field);
if (expr != null) {
//ZK-911. Load from Form bean via expression(so will use form's AccessFieldName)
final ExpressionX formExpr = getFormExpression(eval, field);
final Object value = eval.getValue(null, comp, formExpr); //form.getField(field);
eval.setValue(ctx, comp, expr, value);
}
//TODO should we clear form dirty and notify formStatus?
}
}
} else {
FormStatus formStatus = form.getFormStatus();
if (formStatus.isDirty()) {
Object origin = null;
try {
// Fix Load_save_formTest.java, if @save is different than @load target.
if (_accessInfo.getProperty().getExpressionString().contains(".")) {
try {
ValueReference valueReference = getValueReference(
ctx);
Object target = Fields.get(valueReference.getBase(),
(String) valueReference.getProperty());
Object formStatusOrigin = formStatus.getOrigin();
if (formStatusOrigin != null && !formStatusOrigin.equals(target)) {
MethodHandler handler = ProxyFactory.getHandler(
(Proxy) formStatusOrigin);
if (handler instanceof FormProxyHandler) {
Field originField = handler.getClass().getSuperclass()
.getDeclaredField("_origin");
// change origin here
originField.setAccessible(true);
origin = originField.get(handler);
originField.set(handler, target);
originField.setAccessible(false);
}
}
} catch (Throwable t) {
// ignore
}
}
formStatus.submit(ctx);
} finally {
// if origin is not null, we should set it back to the form bean.
if (origin != null) {
try {
Object formStatusOrigin = formStatus.getOrigin();
MethodHandler handler = ProxyFactory.getHandler((Proxy) formStatusOrigin);
Field originField = handler.getClass().getSuperclass().getDeclaredField("_origin");
// change origin back here
originField.setAccessible(true);
originField.set(handler, origin);
originField.setAccessible(false);
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
}
}
binder.notifyChange(formStatus, "."); //notify change of fxStatus and fxStatus.*
}
if (collector != null) {
collector.addInfo(new SaveInfo(SaveInfo.FORM_SAVE, comp, getConditionString(ctx), getFormId(),
getPropertyString(), form, getArgs(), null));
}
}
private String getConditionString(BindContext ctx) {
StringBuilder condition = new StringBuilder();
if (getConditionType() == ConditionType.BEFORE_COMMAND) {
condition.append("before = '").append(getCommandName()).append("'");
} else if (getConditionType() == ConditionType.AFTER_COMMAND) {
condition.append("after = '").append(getCommandName()).append("'");
} else {
condition.append(ctx.getTriggerEvent() == null ? "" : "event = " + ctx.getTriggerEvent().getName());
}
return condition.length() == 0 ? null : condition.toString();
}
//--SaveBinding--//
public Property getValidate(BindContext ctx) {
//we should not check this binding need to validate or not here,
//since other validator may want to know the value of porperty of this binding, so just provide it
final Binder binder = getBinder();
final BindEvaluatorX eval = binder.getEvaluatorX();
final Component comp = getComponent(); //ctx.getComponent();
final Form form = getFormBean(ctx);
final ExpressionX expr = getBaseExpression(eval);
if (expr != null) {
final Object base = eval.getValue(ctx, comp, expr);
return new PropertyImpl(base, ".", form);
}
return null;
}
//--SaveFormBinding--//
public Set getValidates(BindContext ctx) {
final Set properties = new HashSet(2);
//we should not check this binding need to validate or not here,
//since other validator may want to know the value of porperty of this binding, so just provide it
final Binder binder = getBinder();
final BindEvaluatorX eval = binder.getEvaluatorX();
final Component comp = getComponent(); //ctx.getComponent();
final Form form = getFormBean(ctx);
//remember base and form field
if (form instanceof Form) {
for (String field : ((BinderCtrl) binder).getSaveFormFieldNames(form)) {
if (field.indexOf("[$INDEX$]") != -1) // skip collection field
continue;
final ExpressionX expr = getFieldExpression(eval, field);
if (expr != null) {
//ZK-911. Load from Form bean via expression(so will use form's AccessFieldName)
final ExpressionX formExpr = getFormExpression(eval, field);
final Object value = eval.getValue(null, comp, formExpr); //form.getField(field);
ValueReference valref = null;
try {
valref = eval.getValueReference(ctx, comp, expr);
} catch (PropertyNotFoundException e) {
//ignore PropertyNotFoundException, might be new added expression
}
if (valref == null)
log.debug("value reference not found by expression [" + expr.getExpressionString()
+ "], check if you are trying to save to a variable only expression");
else
properties.add(new PropertyImpl(valref.getBase(), (String) valref.getProperty(), value));
}
}
}
return properties;
}
public boolean hasValidator() {
return _validator != null;
}
public String getValidatorExpressionString() {
return _validator == null ? null : BindEvaluatorXUtil.getExpressionString(_validator);
}
public void validate(ValidationContext vctx) {
Validator validator = getValidator();
if (validator == null) {
throw new NullPointerException("cannot find validator for " + this);
}
validator.validate(vctx);
BindingExecutionInfoCollector collector = ((BinderCtrl) getBinder()).getBindingExecutionInfoCollector();
if (collector != null) {
collector.addInfo(new ValidationInfo(ValidationInfo.PROP, getComponent(), getValidatorExpressionString(),
validator.toString(), Boolean.valueOf(vctx.isValid()),
((BindContextImpl) vctx.getBindContext()).getValidatorArgs(), null));
}
// //collect notify change
// collectNotifyChange(validator,vctx);
}
// private void collectNotifyChange(Validator validator, ValidationContext vctx) {
// //collect notify change
// ValueReference ref = getValueReference(vctx.getBindContext());
// //for special case that a form bind to vm directly, ex @form(save=vm after 'cmd1'), ref will be null
// if(ref!=null){
// BindELContext.addNotifys(getValidatorMethod(validator.getClass()), ref.getBase(), null, null, vctx.getBindContext());
// }else{
// final BindEvaluatorX eval = getBinder().getEvaluatorX();
// final ExpressionX expr = getBaseExpression(eval);
// if (expr != null) {
// final Object base = eval.getValue(vctx.getBindContext(), getComponent(), expr);
// BindELContext.addNotifys(getValidatorMethod(validator.getClass()), base, null, null, vctx.getBindContext());
// }
// }
// }
//get and cache value reference of this binding
private ValueReference getValueReference(BindContext ctx) {
ValueReference valref = (ValueReference) getAttribute(ctx, VALUEREF);
if (valref == null) {
final Component comp = getComponent(); //ctx.getComponent();
final BindEvaluatorX eval = getBinder().getEvaluatorX();
valref = eval.getValueReference(ctx, comp, _accessInfo.getProperty());
if (valref == null) {
throw new UiException(
"value reference not found by expression [" + _accessInfo.getProperty().getExpressionString()
+ "], check if you are trying to save to a variable only expression");
}
setAttribute(ctx, VALUEREF, valref);
}
return valref;
}
private Method getValidatorMethod(Class cls) {
try {
return cls.getMethod("validate", new Class[] { ValidationContext.class });
} catch (NoSuchMethodException e) {
//ignore
}
return null; //shall never come here
}
}
