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#983, #975 rephrase documentation of AfterMapping/BeforeMapping and document @Context usage

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This commit is contained in:
Andreas Gudian 2017-01-02 00:17:25 +01:00
parent ac03999170
commit 32bf03642c
2 changed files with 52 additions and 45 deletions
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46
core-common/src/main/java/org/mapstruct/AfterMapping.java
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@ -23,36 +23,40 @@ import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.mapstruct.util.Experimental;
/**
* Marks a method to be invoked at the end of a generated mapping method, right before the last {@code return} statement
* of the mapping method. The method can be implemented in an abstract mapper class or be declared in a type (class or
* interface) referenced in {@link Mapper#uses()} in order to be used in a mapping method.
* of the mapping method. The method can be implemented in an abstract mapper class, be declared in a type (class or
* interface) referenced in {@link Mapper#uses()}, or in a type used as {@code @}{@link Context} parameter in order to
* be used in a mapping method.
* <p>
* Only methods with return type {@code void} may be annotated with this annotation.
* <p>
* If the method has parameters, the method invocation is only generated if all parameters can be <em>assigned</em> by
* the source or target parameters of the mapping method:
* The method invocation is only generated if the return type of the method (if non-{@code void}) is assignable to the
* return type of the mapping method and all parameters can be <em>assigned</em> by the available source, target or
* context parameters of the mapping method:
* <ul>
* <li>A parameter annotated with {@code @}{@link MappingTarget} is populated with the target instance of the mapping.
* </li>
* <li>A parameter annotated with {@code @}{@link TargetType} is populated with the target type of the mapping.</li>
* <li>Any other parameter is populated with a source parameter of the mapping, whereas each source parameter is used
* once at most.</li>
* <li>Parameters annotated with {@code @}{@link Context} are populated with the context parameters of the mapping
* method.</li>
* <li>Any other parameter is populated with a source parameter of the mapping.</li>
* </ul>
* <p>
* All <em>after-mapping</em> methods that can be applied to a mapping method will be used. Their order is determined by
* their location of definition:
* <ul>
* <li>The order of methods within one type can not be guaranteed, as it depends on the compiler and the processing
* environment implementation.</li>
* <li>Methods declared in one type are used after methods declared in their super-type.</li>
* <li>Methods implemented in the mapper itself are used before methods from types referenced in {@link Mapper#uses()}.
* For non-{@code void} methods, the return value of the method invocation is returned as the result of the mapping
* method if it is not {@code null}.
* <p>
* All <em>after-mapping</em> methods that can be applied to a mapping method will be used. {@code @}{@link Qualifier} /
* {@code @}{@link Named} can be used to filter the methods to use.
* <p>
* The order of the method invocation is determined by their location of definition:
* <ol>
* <li>Methods declared on {@code @}{@link Context} parameters, ordered by the parameter order.</li>
* <li>Methods implemented in the mapper itself.</li>
* <li>Methods from types referenced in {@link Mapper#uses()}, in the order of the type declaration in the annotation.
* </li>
* <li>Types referenced in {@link Mapper#uses()} are searched for <em>after-mapping</em> methods in the order specified
* in the annotation.</li>
* </ul>
* <li>Methods declared in one type are used after methods declared in their super-type</li>
* </ol>
* <em>Important:</em> the order of methods declared within one type can not be guaranteed, as it depends on the
* compiler and the processing environment implementation.
* <p>
* Example:
*
@ -97,8 +101,8 @@ import org.mapstruct.util.Experimental;
*
* @author Andreas Gudian
* @see BeforeMapping
* @see Context
*/
@Experimental
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.CLASS)
public @interface AfterMapping {

51
core-common/src/main/java/org/mapstruct/BeforeMapping.java
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@ -23,39 +23,42 @@ import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.mapstruct.util.Experimental;
/**
* Marks a method to be invoked at the beginning of a generated mapping method. The method can be implemented in an
* abstract mapper class or be declared in a type (class or interface) referenced in {@link Mapper#uses()} in order to
* be used in a mapping method.
* abstract mapper class, be declared in a type (class or interface) referenced in {@link Mapper#uses()}, or in a type
* used as {@code @}{@link Context} parameter in order to be used in a mapping method.
* <p>
* Only methods with return type {@code void} may be annotated with this annotation.
* <p>
* If the method has parameters, the method invocation is only generated if all parameters can be <em>assigned</em> by
* the source or target parameters of the mapping method:
* The method invocation is only generated if the return type of the method (if non-{@code void}) is assignable to the
* return type of the mapping method and all parameters can be <em>assigned</em> by the available source, target or
* context parameters of the mapping method:
* <ul>
* <li>A parameter annotated with {@code @}{@link MappingTarget} is populated with the target instance of the mapping.
* </li>
* <li>A parameter annotated with {@code @}{@link TargetType} is populated with the target type of the mapping.</li>
* <li>Any other parameter is populated with a source parameter of the mapping, whereas each source parameter is used
* once at most.</li>
* <li>Parameters annotated with {@code @}{@link Context} are populated with the context parameters of the mapping
* method.</li>
* <li>Any other parameter is populated with a source parameter of the mapping.</li>
* </ul>
* If a <em>before-mapping</em> method does not contain a {@code @}{@link MappingTarget} parameter, it is invoked
* directly at the beginning of the applicable mapping method. If it contains a {@code @}{@link MappingTarget}
* parameter, the method is invoked after the target parameter has been initialized in the mapping method.
* <p>
* All <em>before-mapping</em> methods that can be applied to a mapping method will be used. Their order is determined
* by their location of definition:
* <ul>
* <li>The order of methods within one type can not be guaranteed, as it depends on the compiler and the processing
* environment implementation.</li>
* <li>Methods declared in one type are used after methods declared in their super-type.</li>
* <li>Methods implemented in the mapper itself are used before methods from types referenced in {@link Mapper#uses()}.
* For non-{@code void} methods, the return value of the method invocation is returned as the result of the mapping
* method if it is not {@code null}.
* <p>
* All <em>before-mapping</em> methods that can be applied to a mapping method will be used. {@code @}{@link Qualifier}
* / {@code @}{@link Named} can be used to filter the methods to use.
* <p>
* The order of the method invocation is determined by their their variant and their location of definition:
* <ol>
* <li>Methods without an {@code @}{@link MappingTarget} parameter are called before any null-checks on source
* parameters and constructing a new target bean.</li>
* <li>Methods with an {@code @}{@link MappingTarget} parameter are called after constructing a new target bean.</li>
* <li>Methods declared on {@code @}{@link Context} parameters, ordered by the parameter order.</li>
* <li>Methods implemented in the mapper itself.</li>
* <li>Methods from types referenced in {@link Mapper#uses()}, in the order of the type declaration in the annotation.
* </li>
* <li>Types referenced in {@link Mapper#uses()} are searched for <em>after-mapping</em> methods in the order specified
* in the annotation.</li>
* </ul>
* <li>Methods declared in one type are used after methods declared in their super-type</li>
* </ol>
* <em>Important:</em> the order of methods declared within one type can not be guaranteed, as it depends on the
* compiler and the processing environment implementation.
* <p>
* Example:
*
@ -101,8 +104,8 @@ import org.mapstruct.util.Experimental;
*
* @author Andreas Gudian
* @see AfterMapping
* @see Context
*/
@Experimental
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.CLASS)
public @interface BeforeMapping {