#region License
/*
* Copyright 2002-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#endregion
using System.Collections;
using Spring.Expressions;
namespace Spring.Validation{
/// <summary>
/// <see cref="IValidator"/> implementation that supports grouping of validators.
/// </summary>
/// <remarks>
/// <p>
/// This validator will be valid when <b>one and only one</b> of the validators in the <c>Validators</c> collection are valid
/// </p>
/// <p>
/// <c>ValidationErrors</c> property will return a union of all validation error messages
/// for the contained validators, but only if this validator is not valid (meaning, when none
/// of the contained validators are valid).
/// </p>
/// <p>
/// By default, this validator group uses <c><see cref="BaseValidatorGroup.FastValidate"/> == true</c> semantics.
/// </p>
/// </remarks>
/// <author>Aleksandar Seovic</author>
/// <author>Erich Eichinger</author>
public class ExclusiveValidatorGroup : BaseValidatorGroup
{
#region Constructors
/// <summary>
/// Initializes a new instance of the <see cref="ExclusiveValidatorGroup"/> class.
/// </summary>
public ExclusiveValidatorGroup()
{
this.FastValidate = true;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExclusiveValidatorGroup"/> class.
/// </summary>
/// <param name="when">The expression that determines if this validator should be evaluated.</param>
public ExclusiveValidatorGroup(string when)
: base(when)
{
this.FastValidate = true;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExclusiveValidatorGroup"/> class.
/// </summary>
/// <param name="when">The expression that determines if this validator should be evaluated.</param>
public ExclusiveValidatorGroup(IExpression when)
: base(when)
{
this.FastValidate = true;
}
#endregion
/// <summary>
/// Actual implementation how to validate the specified object.
/// </summary>
/// <param name="validationContext">The object to validate.</param>
/// <param name="contextParams">Additional context parameters.</param>
/// <param name="errors"><see cref="ValidationErrors"/> instance to add error messages to.</param>
/// <returns><c>True</c> if validation was successful, <c>False</c> otherwise.</returns>
protected override bool ValidateGroup(IDictionary contextParams, IValidationErrors errors, object validationContext)
{
ValidationErrors tmpErrors = new ValidationErrors();
bool valid = false;
foreach (IValidator validator in Validators)
{
bool tmpValid = validator.Validate(validationContext, contextParams, tmpErrors);
if (valid && tmpValid)
{
valid = false;
if (this.FastValidate)
{
break;
}
}
else if (tmpValid)
{
valid = true;
}
}
if (!valid)
{
errors.MergeErrors(tmpErrors);
}
return valid;
}
}
}
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