Package com.expediagroup.transformer.utils

Class ClassUtils

java.lang.Object
com.expediagroup.transformer.utils.ClassUtils
public final class ClassUtils
extends java.lang.Object
Reflection utils for Class objects.

  • Field Summary

    Fields
    Modifier and Type Field Description
    static java.lang.String BUILD_METHOD_NAME
    Default method name used by a Builder for creating an object.
    static java.util.Set<java.lang.Class<?>> CUSTOM_SPECIAL_TYPES
    Custom special types.

  • Constructor Summary

    Constructors
    Constructor Description
    ClassUtils()
    Default constructor.

  • Method Summary

    Modifier and Type Method Description
    boolean allParameterAnnotatedWith​(java.lang.reflect.Constructor constructor, java.lang.Class<? extends java.lang.annotation.Annotation> annotationClass)
    Checks if any of the class constructor's parameters are not annotated with the given class.
    boolean areParameterNamesAvailable​(java.lang.reflect.Constructor constructor)
    Checks if the constructor's parameters names are defined.
    <K> java.lang.reflect.Constructor<K> getAllArgsConstructor​(java.lang.Class<K> clazz)
    Retrieves the all args constructor.
    java.util.Optional<java.lang.Class<?>> getBuilderClass​(java.lang.Class<?> targetClass)
    Returns the builder class.
    java.lang.reflect.Method getBuildMethod​(java.lang.Class<?> parentClass, java.lang.Class<?> builderClass)
    Get build method inside the Builder class.
    ClassType getClassType​(java.lang.Class<?> clazz)
    Returns the class type.
    java.lang.Class<?> getConcreteClass​(java.lang.reflect.Field field, java.lang.Object fieldValue)
    Returns the concrete class of a field.
    java.lang.reflect.Parameter[] getConstructorParameters​(java.lang.reflect.Constructor constructor)
    Gets all the constructor parameters.
    java.lang.Class[] getDeclaredClasses​(java.lang.Class<?> clazz)
    Retrieves all classes defined into the given one.
    java.util.List<java.lang.reflect.Field> getDeclaredFields​(java.lang.Class<?> clazz, boolean skipStatic)
    Return the fields of a class.
    java.lang.Object getDefaultTypeValue​(java.lang.Class<?> objectType)
    Gets the default value of a primitive type.
    <T> java.lang.Class<?> getFieldClass​(java.lang.reflect.Field field, T objectInstance)
    Returns the concrete class of a field.
    java.util.List<java.lang.reflect.Method> getGetterMethods​(java.lang.Class<?> clazz)
    Retrieves all the getters method for the given class.
    <T> T getInstance​(java.lang.reflect.Constructor constructor, java.lang.Object... constructorArgs)
    Creates an instance of the given class invoking the given constructor.
    <K> java.util.function.Supplier<K> getNoArgsConstructor​(java.lang.Class<K> clazz)
    Retrieves the no args constructor.
    java.util.List<java.lang.reflect.Field> getNotFinalFields​(java.lang.Class<?> clazz, java.lang.Boolean skipStatic)
    Returns all the not final fields.
    java.util.List<java.lang.reflect.Field> getPrivateFields​(java.lang.Class<?> clazz)
    Return the private fields of a class.
    java.util.List<java.lang.reflect.Field> getPrivateFields​(java.lang.Class<?> clazz, boolean skipFinal)
    Return the private fields of a class.
    java.util.List<java.lang.reflect.Field> getPrivateFinalFields​(java.lang.Class<?> clazz)
    Return the private final fields of a class.
    java.util.List<java.lang.reflect.Method> getSetterMethods​(java.lang.Class<?> clazz)
    Retrieves all the setters method for the given class.
    int getTotalFields​(java.lang.Class<?> clazz, java.util.function.Predicate<? super java.lang.reflect.Field> predicate)
    Return the total fields matching with the given predicate.
    <K> boolean hasAccessibleConstructors​(java.lang.Class<K> targetClass)
    Checks if the destination class has accessible constructor.
    boolean hasField​(java.lang.Object target, java.lang.String fieldName)
    Checks that the class has a specific field.
    boolean hasFinalFields​(java.lang.Class<?> clazz)
    Checks if a class has any final field.
    boolean hasSetterMethods​(java.lang.Class<?> clazz)
    Checks if a class has setter methods.
    static boolean isBigDecimal​(java.lang.Class<?> type)
    Checks if the given type is a BigDecimal.
    static boolean isBigInteger​(java.lang.Class<?> type)
    Checks if the given type is a BigInteger.
    static boolean isBoolean​(java.lang.Class<?> type)
    Checks if the given type is a Boolean.
    static boolean isByte​(java.lang.Class<?> type)
    Checks if the given type is a Byte.
    static boolean isByteArray​(java.lang.Class<?> type)
    Checks if the given type is a byte[].
    static boolean isChar​(java.lang.Class<?> type)
    Checks if the given type is a Character.
    static boolean isDouble​(java.lang.Class<?> type)
    Checks if the given type is a Double.
    static boolean isFloat​(java.lang.Class<?> type)
    Checks if the given type is a Float.
    static boolean isInt​(java.lang.Class<?> type)
    Checks if the given type is an Integer.
    static boolean isLong​(java.lang.Class<?> type)
    Checks if the given type is a Long.
    boolean isPrimitiveOrSpecialType​(java.lang.Class<?> clazz)
    Checks if an object is a primitive or special type.
    boolean isPrimitiveType​(java.lang.Class<?> clazz)
    Checks if an object is a special type.
    boolean isPrimitiveTypeArray​(java.lang.Class<?> clazz)
    Checks if an object is a primitive type array.
    static boolean isShort​(java.lang.Class<?> type)
    Checks if the given type is a Short.
    boolean isSpecialType​(java.lang.Class<?> clazz)
    Checks if an object is a special type.
    static boolean isString​(java.lang.Class<?> type)
    Checks if the given type is a String.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • BUILD_METHOD_NAME

      public static final java.lang.String BUILD_METHOD_NAME
      Default method name used by a Builder for creating an object.
      See Also:
      Constant Field Values

    • CUSTOM_SPECIAL_TYPES

      public static final java.util.Set<java.lang.Class<?>> CUSTOM_SPECIAL_TYPES
      Custom special types.

  • Constructor Details

    • ClassUtils

      public ClassUtils()
      Default constructor.

  • Method Details

    • isPrimitiveOrSpecialType

      public boolean isPrimitiveOrSpecialType​(java.lang.Class<?> clazz)
      Checks if an object is a primitive or special type.
      Parameters:
      clazz - the class to check
      Returns:
      true if is primitive or special type, false otherwise

    • isPrimitiveType

      public boolean isPrimitiveType​(java.lang.Class<?> clazz)
      Checks if an object is a special type.
      Parameters:
      clazz - the class to check
      Returns:
      true if is special type, false otherwise

    • isPrimitiveTypeArray

      public boolean isPrimitiveTypeArray​(java.lang.Class<?> clazz)
      Checks if an object is a primitive type array.
      Parameters:
      clazz - the class to check
      Returns:
      true if is primitive type array, false otherwise

    • isSpecialType

      public boolean isSpecialType​(java.lang.Class<?> clazz)
      Checks if an object is a special type. The label "Special classes" refers to all objects that has to be copied without applying any special transformation.
      Parameters:
      clazz - the class to check
      Returns:
      true if is special type, false otherwise

    • isDouble

      public static boolean isDouble​(java.lang.Class<?> type)
      Checks if the given type is a Double.
      Parameters:
      type - the class to check
      Returns:
      true if is Double

    • isFloat

      public static boolean isFloat​(java.lang.Class<?> type)
      Checks if the given type is a Float.
      Parameters:
      type - the class to check
      Returns:
      true if is Float

    • isLong

      public static boolean isLong​(java.lang.Class<?> type)
      Checks if the given type is a Long.
      Parameters:
      type - the class to check
      Returns:
      true if is Long

    • isShort

      public static boolean isShort​(java.lang.Class<?> type)
      Checks if the given type is a Short.
      Parameters:
      type - the class to check
      Returns:
      true if is Short

    • isInt

      public static boolean isInt​(java.lang.Class<?> type)
      Checks if the given type is an Integer.
      Parameters:
      type - the class to check
      Returns:
      true if is Integer

    • isByte

      public static boolean isByte​(java.lang.Class<?> type)
      Checks if the given type is a Byte.
      Parameters:
      type - the class to check
      Returns:
      true if is Byte

    • isChar

      public static boolean isChar​(java.lang.Class<?> type)
      Checks if the given type is a Character.
      Parameters:
      type - the class to check
      Returns:
      true if is Character

    • isBoolean

      public static boolean isBoolean​(java.lang.Class<?> type)
      Checks if the given type is a Boolean.
      Parameters:
      type - the class to check
      Returns:
      true if is Boolean

    • isString

      public static boolean isString​(java.lang.Class<?> type)
      Checks if the given type is a String.
      Parameters:
      type - the class to check
      Returns:
      true if is String

    • isBigInteger

      public static boolean isBigInteger​(java.lang.Class<?> type)
      Checks if the given type is a BigInteger.
      Parameters:
      type - the class to check
      Returns:
      true if is String

    • isBigDecimal

      public static boolean isBigDecimal​(java.lang.Class<?> type)
      Checks if the given type is a BigDecimal.
      Parameters:
      type - the class to check
      Returns:
      true if is String

    • isByteArray

      public static boolean isByteArray​(java.lang.Class<?> type)
      Checks if the given type is a byte[].
      Parameters:
      type - the class to check
      Returns:
      true if is String

    • getPrivateFinalFields

      public java.util.List<java.lang.reflect.Field> getPrivateFinalFields​(java.lang.Class<?> clazz)
      Return the private final fields of a class.
      Parameters:
      clazz - class from which gets the field
      Returns:
      a list of private final fields.

    • getTotalFields

      public int getTotalFields​(java.lang.Class<?> clazz, java.util.function.Predicate<? super java.lang.reflect.Field> predicate)
      Return the total fields matching with the given predicate.
      Parameters:
      clazz - class from which gets the field
      predicate - the condition that needs to match
      Returns:
      the total matching item.

    • getPrivateFields

      public java.util.List<java.lang.reflect.Field> getPrivateFields​(java.lang.Class<?> clazz)
      Return the private fields of a class.
      Parameters:
      clazz - class from which gets the field
      Returns:
      a list of private final fields.

    • getPrivateFields

      public java.util.List<java.lang.reflect.Field> getPrivateFields​(java.lang.Class<?> clazz, boolean skipFinal)
      Return the private fields of a class.
      Parameters:
      clazz - class from which gets the field
      skipFinal - if true it skips the final fields otherwise all private fields are retrieved.
      Returns:
      a list of private fields.

    • getDeclaredFields

      public java.util.List<java.lang.reflect.Field> getDeclaredFields​(java.lang.Class<?> clazz, boolean skipStatic)
      Return the fields of a class.
      Parameters:
      clazz - class from which gets the field
      skipStatic - if true it skips the static fields otherwise all private fields are retrieved.
      Returns:
      a list of class fields.

    • getFieldClass

      public <T> java.lang.Class<?> getFieldClass​(java.lang.reflect.Field field, T objectInstance)
      Returns the concrete class of a field.
      Type Parameters:
      T - the object instance class.
      Parameters:
      field - the field for which the concrete class has to be retrieved.
      objectInstance - the object instance.
      Returns:
      the concrete class of a field

    • getConcreteClass

      public java.lang.Class<?> getConcreteClass​(java.lang.reflect.Field field, java.lang.Object fieldValue)
      Returns the concrete class of a field.
      Parameters:
      field - the field for which the concrete class has to be retrieved.
      fieldValue - the field value.
      Returns:
      the concrete class of a field

    • hasAccessibleConstructors

      public <K> boolean hasAccessibleConstructors​(java.lang.Class<K> targetClass)
      Checks if the destination class has accessible constructor.
      Type Parameters:
      K - the target object type
      Parameters:
      targetClass - the destination object class
      Returns:
      true if the target class uses the builder pattern

    • getDeclaredClasses

      public java.lang.Class[] getDeclaredClasses​(java.lang.Class<?> clazz)
      Retrieves all classes defined into the given one.
      Parameters:
      clazz - class where we search for a nested class
      Returns:
      all classes defined into the given one

    • getBuilderClass

      public java.util.Optional<java.lang.Class<?>> getBuilderClass​(java.lang.Class<?> targetClass)
      Returns the builder class.
      Parameters:
      targetClass - the class where the builder should be searched
      Returns:
      the Builder class if available.

    • getBuildMethod

      public java.lang.reflect.Method getBuildMethod​(java.lang.Class<?> parentClass, java.lang.Class<?> builderClass)
      Get build method inside the Builder class.
      Parameters:
      parentClass - the class containing the builder
      builderClass - the builder class (see Builder Pattern)
      Returns:
      Builder build method if present

    • getInstance

      public <T> T getInstance​(java.lang.reflect.Constructor constructor, java.lang.Object... constructorArgs)
      Creates an instance of the given class invoking the given constructor.
      Type Parameters:
      T - the class object type.
      Parameters:
      constructor - the constructor to invoke.
      constructorArgs - the constructor args.
      Returns:
      the object instance.
      Throws:
      InstanceCreationException - in case the object creation fails.

    • getNoArgsConstructor

      public <K> java.util.function.Supplier<K> getNoArgsConstructor​(java.lang.Class<K> clazz)
      Retrieves the no args constructor.
      Type Parameters:
      K - the object type
      Parameters:
      clazz - the class from which gets the all arg constructor.
      Returns:
      the no args constructor
      Throws:
      InvalidBeanException - if no default constructor is available

    • getAllArgsConstructor

      public <K> java.lang.reflect.Constructor<K> getAllArgsConstructor​(java.lang.Class<K> clazz)
      Retrieves the all args constructor.
      Type Parameters:
      K - the object type
      Parameters:
      clazz - the class from which gets the all arg constructor.
      Returns:
      the all args constructor

    • getConstructorParameters

      public java.lang.reflect.Parameter[] getConstructorParameters​(java.lang.reflect.Constructor constructor)
      Gets all the constructor parameters.
      Parameters:
      constructor - the constructor.
      Returns:
      the constructor parameters

    • hasField

      public boolean hasField​(java.lang.Object target, java.lang.String fieldName)
      Checks that the class has a specific field.
      Parameters:
      target - the class where the field should be
      fieldName - the field name to retrieve
      Returns:
      true if the field is available, false otherwise

    • hasSetterMethods

      public boolean hasSetterMethods​(java.lang.Class<?> clazz)
      Checks if a class has setter methods.
      Parameters:
      clazz - clazz the clazz containing the methods.
      Returns:
      true if has at least one setter method, false otherwise

    • hasFinalFields

      public boolean hasFinalFields​(java.lang.Class<?> clazz)
      Checks if a class has any final field.
      Parameters:
      clazz - class from which gets the field
      Returns:
      true if it has private final field, false otherwise.

    • allParameterAnnotatedWith

      public boolean allParameterAnnotatedWith​(java.lang.reflect.Constructor constructor, java.lang.Class<? extends java.lang.annotation.Annotation> annotationClass)
      Checks if any of the class constructor's parameters are not annotated with the given class.
      Parameters:
      constructor - the constructor to check.
      annotationClass - the annotation class to retrieve
      Returns:
      true if any of the parameter does not contains the annotation, false otherwise.

    • areParameterNamesAvailable

      public boolean areParameterNamesAvailable​(java.lang.reflect.Constructor constructor)
      Checks if the constructor's parameters names are defined.
      Parameters:
      constructor - the constructor to check.
      Returns:
      true if some parameters names are not defined, false otherwise.

    • getClassType

      public ClassType getClassType​(java.lang.Class<?> clazz)
      Returns the class type.
      Parameters:
      clazz - the class to check
      Returns:
      the class type ClassType

    • getSetterMethods

      public java.util.List<java.lang.reflect.Method> getSetterMethods​(java.lang.Class<?> clazz)
      Retrieves all the setters method for the given class.
      Parameters:
      clazz - the class containing the methods.
      Returns:
      all the class setter methods

    • getGetterMethods

      public java.util.List<java.lang.reflect.Method> getGetterMethods​(java.lang.Class<?> clazz)
      Retrieves all the getters method for the given class.
      Parameters:
      clazz - the class containing the methods.
      Returns:
      all the class getter methods

    • getDefaultTypeValue

      public java.lang.Object getDefaultTypeValue​(java.lang.Class<?> objectType)
      Gets the default value of a primitive type.
      Parameters:
      objectType - the primitive object class
      Returns:
      the default value of a primitive type

    • getNotFinalFields

      public java.util.List<java.lang.reflect.Field> getNotFinalFields​(java.lang.Class<?> clazz, java.lang.Boolean skipStatic)
      Returns all the not final fields.
      Parameters:
      clazz - the class containing fields.
      skipStatic - if true the static fields are skipped.
      Returns:
      a list containing all the not final fields.