/
customconstraints.pot
687 lines (615 loc) · 24.7 KB
/
customconstraints.pot
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# SOME DESCRIPTIVE TITLE.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: http://bugs.kde.org\n"
"POT-Creation-Date: 2011-11-14 10:37+0000\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <kde-i18n-doc@kde.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
#. Tag: title
#: customconstraints.xml:24
#, no-c-format
msgid "Creating custom constraints"
msgstr ""
#. Tag: para
#: customconstraints.xml:26
#, no-c-format
msgid "Though the Bean Validation API defines a whole set of standard constraint annotations one can easily think of situations in which these standard annotations won't suffice. For these cases you are able to create custom constraints tailored to your specific validation requirements in a simple manner."
msgstr ""
#. Tag: title
#: customconstraints.xml:33
#, no-c-format
msgid "Creating a simple constraint"
msgstr ""
#. Tag: para
#: customconstraints.xml:35
#, no-c-format
msgid "To create a custom constraint, the following three steps are required:"
msgstr ""
#. Tag: para
#: customconstraints.xml:40
#, no-c-format
msgid "Create a constraint annotation"
msgstr ""
#. Tag: para
#: customconstraints.xml:44
#, no-c-format
msgid "Implement a validator"
msgstr ""
#. Tag: para
#: customconstraints.xml:48
#, no-c-format
msgid "Define a default error message"
msgstr ""
#. Tag: title
#: customconstraints.xml:53
#, no-c-format
msgid "The constraint annotation"
msgstr ""
#. Tag: para
#: customconstraints.xml:55
#, no-c-format
msgid "Let's write a constraint annotation, that can be used to express that a given string shall either be upper case or lower case. We'll apply it later on to the <property>licensePlate</property> field of the <classname>Car</classname> class from <xref linkend=\"validator-gettingstarted\"/> to ensure, that the field is always an upper-case string."
msgstr ""
#. Tag: para
#: customconstraints.xml:62
#, no-c-format
msgid "First we need a way to express the two case modes. We might use <classname>String</classname> constants, but a better way to go is to use a Java 5 enum for that purpose:"
msgstr ""
#. Tag: title
#: customconstraints.xml:67
#, no-c-format
msgid "Enum <classname>CaseMode</classname> to express upper vs. lower case"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:70
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"public enum CaseMode {\n"
" UPPER, \n"
" LOWER;\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:73
#, no-c-format
msgid "Now we can define the actual constraint annotation. If you've never designed an annotation before, this may look a bit scary, but actually it's not that hard:"
msgstr ""
#. Tag: title
#: customconstraints.xml:78
#, no-c-format
msgid "Defining CheckCase constraint annotation"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:80
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import static java.lang.annotation.ElementType.*;\n"
"import static java.lang.annotation.RetentionPolicy.*;\n"
"\n"
"import java.lang.annotation.Documented;\n"
"import java.lang.annotation.Retention;\n"
"import java.lang.annotation.Target;\n"
"\n"
"import javax.validation.Constraint;\n"
"import javax.validation.Payload;\n"
"\n"
"@Target( { METHOD, FIELD, ANNOTATION_TYPE })\n"
"@Retention(RUNTIME)\n"
"@Constraint(validatedBy = CheckCaseValidator.class)\n"
"@Documented\n"
"public @interface CheckCase {\n"
"\n"
" String message() default \"{com.mycompany.constraints.checkcase}\";\n"
"\n"
" Class<?>[] groups() default {};\n"
"\n"
" Class<? extends Payload>[] payload() default {};\n"
" \n"
" CaseMode value();\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:83
#, no-c-format
msgid "An annotation type is defined using the <code>@interface</code> keyword. All attributes of an annotation type are declared in a method-like manner. The specification of the Bean Validation API demands, that any constraint annotation defines"
msgstr ""
#. Tag: para
#: customconstraints.xml:90
#, no-c-format
msgid "an attribute <property>message</property> that returns the default key for creating error messages in case the constraint is violated"
msgstr ""
#. Tag: para
#: customconstraints.xml:96
#, no-c-format
msgid "an attribute <property>groups</property> that allows the specification of validation groups, to which this constraint belongs (see <xref linkend=\"validator-usingvalidator-validationgroups\"/>). This must default to an empty array of type <classname>Class<?></classname>."
msgstr ""
#. Tag: para
#: customconstraints.xml:104
#, no-c-format
msgid "an attribute <classname>payload</classname> that can be used by clients of the Bean Validation API to assign custom payload objects to a constraint. This attribute is not used by the API itself."
msgstr ""
#. Tag: para
#: customconstraints.xml:108
#, no-c-format
msgid "An example for a custom payload could be the definition of a severity."
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:111
#, no-c-format
msgid ""
"public class Severity {\n"
" public static class Info extends Payload {};\n"
" public static class Error extends Payload {};\n"
"}\n"
"\n"
"public class ContactDetails {\n"
" @NotNull(message=\"Name is mandatory\", payload=Severity.Error.class)\n"
" private String name;\n"
"\n"
" @NotNull(message=\"Phone number not specified, but not mandatory\", payload=Severity.Info.class)\n"
" private String phoneNumber;\n"
"\n"
" // ...\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:113
#, no-c-format
msgid "Now a client can after the validation of a <classname>ContactDetails</classname> instance access the severity of a constraint using <methodname>ConstraintViolation.getConstraintDescriptor().getPayload()</methodname> and adjust its behaviour depending on the severity."
msgstr ""
#. Tag: para
#: customconstraints.xml:122
#, no-c-format
msgid "Besides those three mandatory attributes (<property>message</property>, <property>groups</property> and <property>payload</property>) we add another one allowing for the required case mode to be specified. The name <property>value</property> is a special one, which can be omitted upon using the annotation, if it is the only attribute specified, as e.g. in <code>@CheckCase(CaseMode.UPPER)</code>."
msgstr ""
#. Tag: para
#: customconstraints.xml:130
#, no-c-format
msgid "In addition we annotate the annotation type with a couple of so-called meta annotations:"
msgstr ""
#. Tag: para
#: customconstraints.xml:135
#, no-c-format
msgid "<code>@Target({ METHOD, FIELD, ANNOTATION_TYPE })</code>: Says, that methods, fields and annotation declarations may be annotated with @CheckCase (but not type declarations e.g.)"
msgstr ""
#. Tag: para
#: customconstraints.xml:141
#, no-c-format
msgid "<code>@Retention(RUNTIME)</code>: Specifies, that annotations of this type will be available at runtime by the means of reflection"
msgstr ""
#. Tag: para
#: customconstraints.xml:147
#, no-c-format
msgid "<code>@Constraint(validatedBy = CheckCaseValidator.class)</code>: Specifies the validator to be used to validate elements annotated with @CheckCase"
msgstr ""
#. Tag: para
#: customconstraints.xml:153
#, no-c-format
msgid "<code>@Documented</code>: Says, that the use of <code>@CheckCase</code> will be contained in the JavaDoc of elements annotated with it"
msgstr ""
#. Tag: para
#: customconstraints.xml:160
#, no-c-format
msgid "Hibernate Validator provides support for the validation of method parameters using constraint annotations (see <xref linkend=\"validator-customoptions-methodvalidation\"/>)."
msgstr ""
#. Tag: para
#: customconstraints.xml:164
#, no-c-format
msgid "In order to use a custom constraint for parameter validation the <classname>ElementType.PARAMETER</classname> must be specified within the <classname>@Target</classname> annotation. This is already the case for all constraints defined by the Bean Validation API and also the custom constraints provided by Hibernate Validator."
msgstr ""
#. Tag: title
#: customconstraints.xml:173
#, no-c-format
msgid "The constraint validator"
msgstr ""
#. Tag: para
#: customconstraints.xml:176
#, no-c-format
msgid "Next, we need to implement a constraint validator, that's able to validate elements with a <classname>@CheckCase</classname> annotation. To do so, we implement the interface <classname>ConstraintValidator</classname> as shown below:"
msgstr ""
#. Tag: title
#: customconstraints.xml:182
#, no-c-format
msgid "Implementing a constraint validator for the constraint <classname>CheckCase</classname>"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:185
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import javax.validation.ConstraintValidator;\n"
"import javax.validation.ConstraintValidatorContext;\n"
"\n"
"public class CheckCaseValidator implements ConstraintValidator<CheckCase, String> {\n"
"\n"
" private CaseMode caseMode;\n"
"\n"
" public void initialize(CheckCase constraintAnnotation) {\n"
" this.caseMode = constraintAnnotation.value();\n"
" }\n"
"\n"
" public boolean isValid(String object, ConstraintValidatorContext constraintContext) {\n"
"\n"
" if (object == null)\n"
" return true;\n"
"\n"
" if (caseMode == CaseMode.UPPER)\n"
" return object.equals(object.toUpperCase());\n"
" else\n"
" return object.equals(object.toLowerCase());\n"
" }\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:188
#, no-c-format
msgid "The <classname>ConstraintValidator</classname> interface defines two type parameters, which we set in our implementation. The first one specifies the annotation type to be validated (in our example <classname>CheckCase</classname>), the second one the type of elements, which the validator can handle (here <classname>String</classname>)."
msgstr ""
#. Tag: para
#: customconstraints.xml:195
#, no-c-format
msgid "In case a constraint annotation is allowed at elements of different types, a <classname>ConstraintValidator</classname> for each allowed type has to be implemented and registered at the constraint annotation as shown above."
msgstr ""
#. Tag: para
#: customconstraints.xml:200
#, no-c-format
msgid "The implementation of the validator is straightforward. The <methodname>initialize()</methodname> method gives us access to the attribute values of the annotation to be validated. In the example we store the <classname>CaseMode</classname> in a field of the validator for further usage."
msgstr ""
#. Tag: para
#: customconstraints.xml:206
#, no-c-format
msgid "In the <methodname>isValid()</methodname> method we implement the logic, that determines, whether a <classname>String</classname> is valid according to a given <classname>@CheckCase</classname> annotation or not. This decision depends on the case mode retrieved in <classname>initialize()</classname>. As the Bean Validation specification recommends, we consider <code>null</code> values as being valid. If <code>null</code> is not a valid value for an element, it should be annotated with <code>@NotNull</code> explicitly."
msgstr ""
#. Tag: title
#: customconstraints.xml:216
#, no-c-format
msgid "The ConstraintValidatorContext"
msgstr ""
#. Tag: para
#: customconstraints.xml:218
#, no-c-format
msgid "relies on the default error message generation by just returning <constant>true</constant> or <constant>false</constant> from the <methodname>isValid</methodname> call. Using the passed <classname>ConstraintValidatorContext</classname> object it is possible to either add additional error messages or completely disable the default error message generation and solely define custom error messages. The <classname>ConstraintValidatorContext</classname> API is modeled as fluent interface and is best demonstrated with an example:"
msgstr ""
#. Tag: title
#: customconstraints.xml:230
#, no-c-format
msgid "Use of ConstraintValidatorContext to define custom error messages"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:233
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import javax.validation.ConstraintValidator;\n"
"import javax.validation.ConstraintValidatorContext;\n"
"\n"
"public class CheckCaseValidator implements ConstraintValidator<CheckCase, String> {\n"
"\n"
" private CaseMode caseMode;\n"
"\n"
" public void initialize(CheckCase constraintAnnotation) {\n"
" this.caseMode = constraintAnnotation.value();\n"
" }\n"
"\n"
" public boolean isValid(String object, ConstraintValidatorContext constraintContext) {\n"
"\n"
" if (object == null)\n"
" return true;\n"
" \n"
" boolean isValid;\n"
" if (caseMode == CaseMode.UPPER) {\n"
" isValid = object.equals(object.toUpperCase());\n"
" }\n"
" else {\n"
" isValid = object.equals(object.toLowerCase());\n"
" }\n"
" \n"
" if(!isValid) {\n"
" constraintContext.disableDefaultConstraintViolation();\n"
" constraintContext.buildConstraintViolationWithTemplate( \"{com.mycompany.constraints.CheckCase.message}\" ).addConstraintViolation();\n"
" }\n"
" return result;\n"
" }\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:236
#, no-c-format
msgid "shows how you can disable the default error message generation and add a custom error message using a specified message template. In this example the use of the <classname>ConstraintValidatorContext</classname> results in the same error message as the default error message generation."
msgstr ""
#. Tag: para
#: customconstraints.xml:242
#, no-c-format
msgid "It is important to end each new constraint violation with <methodname>addConstraintViolation</methodname>. Only after that the new constraint violation will be created."
msgstr ""
#. Tag: para
#: customconstraints.xml:247
#, no-c-format
msgid "In case you are implementing a <classname>ConstraintValidator</classname> a class level constraint it is also possible to adjust set the property path for the created constraint violations. This is important for the case where you validate multiple properties of the class or even traverse the object graph. A custom property path creation could look like <xref linkend=\"example-custom-error\"/>."
msgstr ""
#. Tag: title
#: customconstraints.xml:256
#, no-c-format
msgid "Adding new <classname>ConstraintViolation</classname> with custom property path"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:259
#, no-c-format
msgid ""
"public boolean isValid(Group group, ConstraintValidatorContext constraintValidatorContext) {\n"
" boolean isValid = false;\n"
" ...\n"
"\n"
" if(!isValid) {\n"
" constraintValidatorContext\n"
" .buildConstraintViolationWithTemplate( \"{my.custom.template}\" )\n"
" .addNode( \"myProperty\" ).addConstraintViolation();\n"
" }\n"
" return isValid;\n"
"}"
msgstr ""
#. Tag: title
#: customconstraints.xml:265
#, no-c-format
msgid "The error message"
msgstr ""
#. Tag: para
#: customconstraints.xml:267
#, no-c-format
msgid "Finally we need to specify the error message, that shall be used, in case a <classname>@CheckCase</classname> constraint is violated. To do so, we add the following to our custom <filename>ValidationMessages.properties</filename> (see also <xref linkend=\"section-message-interpolation\"/>)"
msgstr ""
#. Tag: title
#: customconstraints.xml:274
#, no-c-format
msgid "Defining a custom error message for the <classname>CheckCase</classname> constraint"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:277
#, no-c-format
msgid "com.mycompany.constraints.CheckCase.message=Case mode must be {value}."
msgstr ""
#. Tag: para
#: customconstraints.xml:280
#, no-c-format
msgid "If a validation error occurs, the validation runtime will use the default value, that we specified for the message attribute of the <classname>@CheckCase</classname> annotation to look up the error message in this file."
msgstr ""
#. Tag: title
#: customconstraints.xml:287
#, no-c-format
msgid "Using the constraint"
msgstr ""
#. Tag: para
#: customconstraints.xml:289
#, no-c-format
msgid "Now that our first custom constraint is completed, we can use it in the <classname>Car</classname> class from the <xref linkend=\"validator-gettingstarted\"/> chapter to specify that the <property>licensePlate</property> field shall only contain upper-case strings:"
msgstr ""
#. Tag: title
#: customconstraints.xml:296
#, no-c-format
msgid "Applying the <classname>CheckCase</classname> constraint"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:299
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import javax.validation.constraints.Min;\n"
"import javax.validation.constraints.NotNull;\n"
"import javax.validation.constraints.Size;\n"
"\n"
"public class Car {\n"
"\n"
" @NotNull\n"
" private String manufacturer;\n"
"\n"
" @NotNull\n"
" @Size(min = 2, max = 14)\n"
" @CheckCase(CaseMode.UPPER)\n"
" private String licensePlate;\n"
"\n"
" @Min(2)\n"
" private int seatCount;\n"
" \n"
" public Car(String manufacturer, String licencePlate, int seatCount) {\n"
"\n"
" this.manufacturer = manufacturer;\n"
" this.licensePlate = licencePlate;\n"
" this.seatCount = seatCount;\n"
" }\n"
"\n"
" //getters and setters ...\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:302
#, no-c-format
msgid "Finally let's demonstrate in a little test that the <classname>@CheckCase</classname> constraint is properly validated:"
msgstr ""
#. Tag: title
#: customconstraints.xml:307
#, no-c-format
msgid "Testcase demonstrating the <classname>CheckCase</classname> validation"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:310
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import static org.junit.Assert.*;\n"
"\n"
"import java.util.Set;\n"
"\n"
"import javax.validation.ConstraintViolation;\n"
"import javax.validation.Validation;\n"
"import javax.validation.Validator;\n"
"import javax.validation.ValidatorFactory;\n"
"\n"
"import org.junit.BeforeClass;\n"
"import org.junit.Test;\n"
"\n"
"public class CarTest {\n"
"\n"
" private static Validator validator;\n"
"\n"
" @BeforeClass\n"
" public static void setUp() {\n"
" ValidatorFactory factory = Validation.buildDefaultValidatorFactory();\n"
" validator = factory.getValidator();\n"
" }\n"
"\n"
" @Test\n"
" public void testLicensePlateNotUpperCase() {\n"
"\n"
" Car car = new Car(\"Morris\", \"dd-ab-123\", 4);\n"
"\n"
" Set<ConstraintViolation<Car>> constraintViolations =\n"
" validator.validate(car);\n"
" assertEquals(1, constraintViolations.size());\n"
" assertEquals(\n"
" \"Case mode must be UPPER.\", \n"
" constraintViolations.iterator().next().getMessage());\n"
" }\n"
"\n"
" @Test\n"
" public void carIsValid() {\n"
"\n"
" Car car = new Car(\"Morris\", \"DD-AB-123\", 4);\n"
"\n"
" Set<ConstraintViolation<Car>> constraintViolations =\n"
" validator.validate(car);\n"
"\n"
" assertEquals(0, constraintViolations.size());\n"
" }\n"
"}"
msgstr ""
#. Tag: title
#: customconstraints.xml:316
#, no-c-format
msgid "Constraint composition"
msgstr ""
#. Tag: para
#: customconstraints.xml:318
#, no-c-format
msgid "Looking at the <property>licensePlate</property> field of the <classname>Car</classname> class in <xref linkend=\"example-car-with-checkcase\"/>, we see three constraint annotations already. In complexer scenarios, where even more constraints could be applied to one element, this might become a bit confusing easily. Furthermore, if we had a <property>licensePlate</property> field in another class, we would have to copy all constraint declarations to the other class as well, violating the DRY principle."
msgstr ""
#. Tag: para
#: customconstraints.xml:327
#, no-c-format
msgid "This problem can be tackled using compound constraints. In the following we create a new constraint annotation <classname>@ValidLicensePlate</classname>, that comprises the constraints <classname>@NotNull</classname>, <classname>@Size</classname> and <classname>@CheckCase</classname>:"
msgstr ""
#. Tag: title
#: customconstraints.xml:334
#, no-c-format
msgid "Creating a composing constraint <classname>ValidLicensePlate</classname>"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:337
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"import static java.lang.annotation.ElementType.*;\n"
"import static java.lang.annotation.RetentionPolicy.*;\n"
"\n"
"import java.lang.annotation.Documented;\n"
"import java.lang.annotation.Retention;\n"
"import java.lang.annotation.Target;\n"
"\n"
"import javax.validation.Constraint;\n"
"import javax.validation.Payload;\n"
"import javax.validation.constraints.NotNull;\n"
"import javax.validation.constraints.Size;\n"
"\n"
"@NotNull\n"
"@Size(min = 2, max = 14)\n"
"@CheckCase(CaseMode.UPPER)\n"
"@Target( { METHOD, FIELD, ANNOTATION_TYPE })\n"
"@Retention(RUNTIME)\n"
"@Constraint(validatedBy = {})\n"
"@Documented\n"
"public @interface ValidLicensePlate {\n"
"\n"
" String message() default \"{com.mycompany.constraints.validlicenseplate}\";\n"
"\n"
" Class<?>[] groups() default {};\n"
"\n"
" Class<? extends Payload>[] payload() default {};\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:340
#, no-c-format
msgid "To do so, we just have to annotate the constraint declaration with its comprising constraints (btw. that's exactly why we allowed annotation types as target for the <classname>@CheckCase</classname> annotation). As no additional validation is required for the <classname>@ValidLicensePlate</classname> annotation itself, we don't declare a validator within the <classname>@Constraint </classname>meta annotation."
msgstr ""
#. Tag: para
#: customconstraints.xml:348
#, no-c-format
msgid "Using the new compound constraint at the <property>licensePlate</property> field now is fully equivalent to the previous version, where we declared the three constraints directly at the field itself:"
msgstr ""
#. Tag: title
#: customconstraints.xml:354
#, no-c-format
msgid "Application of composing constraint <classname>ValidLicensePlate</classname>"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:357
#, no-c-format
msgid ""
"package com.mycompany;\n"
"\n"
"public class Car {\n"
"\n"
" @ValidLicensePlate\n"
" private String licensePlate;\n"
"\n"
" //...\n"
"\n"
"}"
msgstr ""
#. Tag: para
#: customconstraints.xml:360
#, no-c-format
msgid "The set of <classname>ConstraintViolations</classname> retrieved when validating a <classname>Car</classname> instance will contain an entry for each violated composing constraint of the <classname>@ValidLicensePlate</classname> constraint. If you rather prefer a single <classname>ConstraintViolation</classname> in case any of the composing constraints is violated, the <classname>@ReportAsSingleViolation</classname> meta constraint can be used as follows:"
msgstr ""
#. Tag: title
#: customconstraints.xml:370
#, no-c-format
msgid "Usage of <classname>@ReportAsSingleViolation</classname>"
msgstr ""
#. Tag: programlisting
#: customconstraints.xml:372
#, no-c-format
msgid ""
"//...\n"
"@ReportAsSingleViolation\n"
"public @interface ValidLicensePlate {\n"
"\n"
" String message() default \"{com.mycompany.constraints.validlicenseplate}\";\n"
"\n"
" Class<?>[] groups() default {};\n"
"\n"
" Class<? extends Payload>[] payload() default {};\n"
"\n"
"}"
msgstr ""