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package com.sun.faces.facelets.tag;
import com.sun.faces.facelets.el.LegacyMethodBinding;
import javax.el.MethodExpression;
import javax.faces.el.MethodBinding;
import javax.faces.view.facelets.*;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Optional Rule for binding Method[Binding|Expression] properties
*
* @author Mike Kienenberger
* @author Jacob Hookom
*/
public final 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;
}
public Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta) {
if (!name.equals(this.methodName))
return null;
if (MethodBinding.class.equals(meta.getPropertyType(name))) {
Method method = meta.getWriteMethod(name);
if (method != null) {
return new MethodBindingMetadata(method, attribute,
this.returnTypeClass, this.params);
}
} else if (MethodExpression.class.equals(meta.getPropertyType(name))) {
Method method = meta.getWriteMethod(name);
if (method != null) {
return new MethodExpressionMetadata(method, attribute,
this.returnTypeClass, this.params);
}
}
return null;
}
private static class MethodBindingMetadata extends Metadata {
private final Method _method;
private final TagAttribute _attribute;
private Class[] _paramList;
private Class _returnType;
public MethodBindingMetadata(Method method, TagAttribute attribute,
Class returnType, Class[] paramList) {
_method = method;
_attribute = attribute;
_paramList = paramList;
_returnType = returnType;
}
public void applyMetadata(FaceletContext ctx, Object instance) {
MethodExpression expr = _attribute.getMethodExpression(ctx,
_returnType, _paramList);
try {
_method.invoke(instance, new LegacyMethodBinding(expr) );
} catch (InvocationTargetException e) {
throw new TagAttributeException(_attribute, e.getCause());
} catch (Exception e) {
throw new TagAttributeException(_attribute, e);
}
}
}
private static class MethodExpressionMetadata extends Metadata {
private final Method _method;
private final TagAttribute _attribute;
private Class[] _paramList;
private Class _returnType;
public MethodExpressionMetadata(Method method, TagAttribute attribute,
Class returnType, Class[] paramList) {
_method = method;
_attribute = attribute;
_paramList = paramList;
_returnType = returnType;
}
public void applyMetadata(FaceletContext ctx, Object instance) {
MethodExpression expr = _attribute.getMethodExpression(ctx,
_returnType, _paramList);
try {
_method.invoke(instance, expr );
} catch (InvocationTargetException e) {
throw new TagAttributeException(_attribute, e.getCause());
} catch (Exception e) {
throw new TagAttributeException(_attribute, e);
}
}
}
}