121 lines
4.7 KiB
Ruby
121 lines
4.7 KiB
Ruby
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# -*- coding: utf-8 -*-
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# Extracted from dm-validations 0.9.10
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#
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# Copyright (c) 2007 Guy van den Berg
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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module CouchRest
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module Validation
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# All validators extend this base class. Validators must:
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#
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# * Implement the initialize method to capture its parameters, also calling
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# super to have this parent class capture the optional, general :if and
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# :unless parameters.
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# * Implement the call method, returning true or false. The call method
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# provides the validation logic.
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#
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# @author Guy van den Berg
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class GenericValidator
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attr_accessor :if_clause, :unless_clause
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attr_reader :field_name
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# Construct a validator. Capture the :if and :unless clauses when present.
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#
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# @param field<String, Symbol> The property specified for validation
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#
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# @option :if<Symbol, Proc> The name of a method or a Proc to call to
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# determine if the validation should occur.
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# @option :unless<Symbol, Proc> The name of a method or a Proc to call to
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# determine if the validation should not occur
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# All additional key/value pairs are passed through to the validator
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# that is sub-classing this GenericValidator
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#
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def initialize(field, opts = {})
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@if_clause = opts.delete(:if)
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@unless_clause = opts.delete(:unless)
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end
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# Add an error message to a target resource. If the error corresponds to a
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# specific field of the resource, add it to that field, otherwise add it
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# as a :general message.
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#
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# @param <Object> target the resource that has the error
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# @param <String> message the message to add
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# @param <Symbol> field_name the name of the field that caused the error
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#
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# TODO - should the field_name for a general message be :default???
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#
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def add_error(target, message, field_name = :general)
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target.errors.add(field_name, message)
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end
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# Call the validator. "call" is used so the operation is BoundMethod and
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# Block compatible. This must be implemented in all concrete classes.
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#
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# @param <Object> target the resource that the validator must be called
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# against
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# @return <Boolean> true if valid, otherwise false
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def call(target)
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raise NotImplementedError, "CouchRest::Validation::GenericValidator::call must be overriden in a subclass"
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end
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# Determines if this validator should be run against the
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# target by evaluating the :if and :unless clauses
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# optionally passed while specifying any validator.
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#
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# @param <Object> target the resource that we check against
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# @return <Boolean> true if should be run, otherwise false
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def execute?(target)
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if unless_clause = self.unless_clause
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if unless_clause.is_a?(Symbol)
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return false if target.send(unless_clause)
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elsif unless_clause.respond_to?(:call)
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return false if unless_clause.call(target)
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end
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end
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if if_clause = self.if_clause
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if if_clause.is_a?(Symbol)
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return target.send(if_clause)
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elsif if_clause.respond_to?(:call)
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return if_clause.call(target)
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end
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end
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true
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end
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def ==(other)
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self.class == other.class &&
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self.field_name == other.field_name &&
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self.class == other.class &&
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self.if_clause == other.if_clause &&
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self.unless_clause == other.unless_clause &&
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self.instance_variable_get(:@options) == other.instance_variable_get(:@options)
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end
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end # class GenericValidator
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end # module Validation
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end # module CouchRest
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