Package com.expediagroup.transformer.utils

Class 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.

    • Constructor Summary

      Constructors 
      Constructor Description
      ClassUtils()
      Default constructor.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      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 Detail

      • 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

    • Constructor Detail

      • ClassUtils

        public ClassUtils()
        Default constructor.

    • Method Detail

      • 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.