A {@code Field} permits widening conversions to occur during a get or - * set access operation, but throws an {@code IllegalArgumentException} if a - * narrowing conversion would occur. - * - * @see Member - * @see java.lang.Class - * @see java.lang.Class#getFields() - * @see java.lang.Class#getField(String) - * @see java.lang.Class#getDeclaredFields() - * @see java.lang.Class#getDeclaredField(String) - * - * @author Kenneth Russell - * @author Nakul Saraiya - */ -public final -class Field extends AccessibleObject implements Member { - - private Class clazz; - private int slot; - // This is guaranteed to be interned by the VM in the 1.4 - // reflection implementation - private String name; - private Class type; - private int modifiers; - // Generics and annotations support - private transient String signature; - private byte[] annotations; - // For sharing of FieldAccessors. This branching structure is - // currently only two levels deep (i.e., one root Field and - // potentially many Field objects pointing to it.) - private Field root; - - // Generics infrastructure - - private String getGenericSignature() {return signature;} - - - /** - * Package-private constructor used by ReflectAccess to enable - * instantiation of these objects in Java code from the java.lang - * package via sun.reflect.LangReflectAccess. - */ - Field(Class declaringClass, - String name, - Class type, - int modifiers, - int slot, - String signature, - byte[] annotations) - { - this.clazz = declaringClass; - this.name = name; - this.type = type; - this.modifiers = modifiers; - this.slot = slot; - this.signature = signature; - this.annotations = annotations; - } - - /** - * Package-private routine (exposed to java.lang.Class via - * ReflectAccess) which returns a copy of this Field. The copy's - * "root" field points to this Field. - */ - Field copy() { - // This routine enables sharing of FieldAccessor objects - // among Field objects which refer to the same underlying - // method in the VM. (All of this contortion is only necessary - // because of the "accessibility" bit in AccessibleObject, - // which implicitly requires that new java.lang.reflect - // objects be fabricated for each reflective call on Class - // objects.) - Field res = new Field(clazz, name, type, modifiers, slot, signature, annotations); - res.root = this; - return res; - } - - /** - * Returns the {@code Class} object representing the class or interface - * that declares the field represented by this {@code Field} object. - */ - public Class getDeclaringClass() { - return clazz; - } - - /** - * Returns the name of the field represented by this {@code Field} object. - */ - public String getName() { - return name; - } - - /** - * Returns the Java language modifiers for the field represented - * by this {@code Field} object, as an integer. The {@code Modifier} class should - * be used to decode the modifiers. - * - * @see Modifier - */ - public int getModifiers() { - return modifiers; - } - - /** - * Returns {@code true} if this field represents an element of - * an enumerated type; returns {@code false} otherwise. - * - * @return {@code true} if and only if this field represents an element of - * an enumerated type. - * @since 1.5 - */ - public boolean isEnumConstant() { - return (getModifiers() & Modifier.ENUM) != 0; - } - - /** - * Returns {@code true} if this field is a synthetic - * field; returns {@code false} otherwise. - * - * @return true if and only if this field is a synthetic - * field as defined by the Java Language Specification. - * @since 1.5 - */ - public boolean isSynthetic() { - return Modifier.isSynthetic(getModifiers()); - } - - /** - * Returns a {@code Class} object that identifies the - * declared type for the field represented by this - * {@code Field} object. - * - * @return a {@code Class} object identifying the declared - * type of the field represented by this object - */ - public Class getType() { - return type; - } - - /** - * Returns a {@code Type} object that represents the declared type for - * the field represented by this {@code Field} object. - * - *
If the {@code Type} is a parameterized type, the - * {@code Type} object returned must accurately reflect the - * actual type parameters used in the source code. - * - *
If the type of the underlying field is a type variable or a - * parameterized type, it is created. Otherwise, it is resolved. - * - * @return a {@code Type} object that represents the declared type for - * the field represented by this {@code Field} object - * @throws GenericSignatureFormatError if the generic field - * signature does not conform to the format specified in - * The Java™ Virtual Machine Specification - * @throws TypeNotPresentException if the generic type - * signature of the underlying field refers to a non-existent - * type declaration - * @throws MalformedParameterizedTypeException if the generic - * signature of the underlying field refers to a parameterized type - * that cannot be instantiated for any reason - * @since 1.5 - */ - public Type getGenericType() { - throw new UnsupportedOperationException(); - } - - - /** - * Compares this {@code Field} against the specified object. Returns - * true if the objects are the same. Two {@code Field} objects are the same if - * they were declared by the same class and have the same name - * and type. - */ - public boolean equals(Object obj) { - if (obj != null && obj instanceof Field) { - Field other = (Field)obj; - return (getDeclaringClass() == other.getDeclaringClass()) - && (getName() == other.getName()) - && (getType() == other.getType()); - } - return false; - } - - /** - * Returns a hashcode for this {@code Field}. This is computed as the - * exclusive-or of the hashcodes for the underlying field's - * declaring class name and its name. - */ - public int hashCode() { - return getDeclaringClass().getName().hashCode() ^ getName().hashCode(); - } - - /** - * Returns a string describing this {@code Field}. The format is - * the access modifiers for the field, if any, followed - * by the field type, followed by a space, followed by - * the fully-qualified name of the class declaring the field, - * followed by a period, followed by the name of the field. - * For example: - *
- * public static final int java.lang.Thread.MIN_PRIORITY - * private int java.io.FileDescriptor.fd - *- * - *
The modifiers are placed in canonical order as specified by - * "The Java Language Specification". This is {@code public}, - * {@code protected} or {@code private} first, and then other - * modifiers in the following order: {@code static}, {@code final}, - * {@code transient}, {@code volatile}. - */ - public String toString() { - int mod = getModifiers(); - return (((mod == 0) ? "" : (Modifier.toString(mod) + " ")) - + getTypeName(getType()) + " " - + getTypeName(getDeclaringClass()) + "." - + getName()); - } - - /** - * Returns a string describing this {@code Field}, including - * its generic type. The format is the access modifiers for the - * field, if any, followed by the generic field type, followed by - * a space, followed by the fully-qualified name of the class - * declaring the field, followed by a period, followed by the name - * of the field. - * - *
The modifiers are placed in canonical order as specified by - * "The Java Language Specification". This is {@code public}, - * {@code protected} or {@code private} first, and then other - * modifiers in the following order: {@code static}, {@code final}, - * {@code transient}, {@code volatile}. - * - * @return a string describing this {@code Field}, including - * its generic type - * - * @since 1.5 - */ - public String toGenericString() { - int mod = getModifiers(); - Type fieldType = getGenericType(); - return (((mod == 0) ? "" : (Modifier.toString(mod) + " ")) - + ((fieldType instanceof Class) ? - getTypeName((Class)fieldType): fieldType.toString())+ " " - + getTypeName(getDeclaringClass()) + "." - + getName()); - } - - /** - * Returns the value of the field represented by this {@code Field}, on - * the specified object. The value is automatically wrapped in an - * object if it has a primitive type. - * - *
The underlying field's value is obtained as follows: - * - *
If the underlying field is a static field, the {@code obj} argument - * is ignored; it may be null. - * - *
Otherwise, the underlying field is an instance field. If the - * specified {@code obj} argument is null, the method throws a - * {@code NullPointerException}. If the specified object is not an - * instance of the class or interface declaring the underlying - * field, the method throws an {@code IllegalArgumentException}. - * - *
If this {@code Field} object is enforcing Java language access control, and - * the underlying field is inaccessible, the method throws an - * {@code IllegalAccessException}. - * If the underlying field is static, the class that declared the - * field is initialized if it has not already been initialized. - * - *
Otherwise, the value is retrieved from the underlying instance - * or static field. If the field has a primitive type, the value - * is wrapped in an object before being returned, otherwise it is - * returned as is. - * - *
If the field is hidden in the type of {@code obj}, - * the field's value is obtained according to the preceding rules. - * - * @param obj object from which the represented field's value is - * to be extracted - * @return the value of the represented field in object - * {@code obj}; primitive values are wrapped in an appropriate - * object before being returned - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not an - * instance of the class or interface declaring the underlying - * field (or a subclass or implementor thereof). - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - */ - public Object get(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).get(obj); - } - - /** - * Gets the value of a static or instance {@code boolean} field. - * - * @param obj the object to extract the {@code boolean} value - * from - * @return the value of the {@code boolean} field - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code boolean} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public boolean getBoolean(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getBoolean(obj); - } - - /** - * Gets the value of a static or instance {@code byte} field. - * - * @param obj the object to extract the {@code byte} value - * from - * @return the value of the {@code byte} field - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code byte} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public byte getByte(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getByte(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code char} or of another primitive type convertible to - * type {@code char} via a widening conversion. - * - * @param obj the object to extract the {@code char} value - * from - * @return the value of the field converted to type {@code char} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code char} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public char getChar(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getChar(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code short} or of another primitive type convertible to - * type {@code short} via a widening conversion. - * - * @param obj the object to extract the {@code short} value - * from - * @return the value of the field converted to type {@code short} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code short} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public short getShort(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getShort(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code int} or of another primitive type convertible to - * type {@code int} via a widening conversion. - * - * @param obj the object to extract the {@code int} value - * from - * @return the value of the field converted to type {@code int} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code int} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public int getInt(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getInt(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code long} or of another primitive type convertible to - * type {@code long} via a widening conversion. - * - * @param obj the object to extract the {@code long} value - * from - * @return the value of the field converted to type {@code long} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code long} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public long getLong(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getLong(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code float} or of another primitive type convertible to - * type {@code float} via a widening conversion. - * - * @param obj the object to extract the {@code float} value - * from - * @return the value of the field converted to type {@code float} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code float} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public float getFloat(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getFloat(obj); - } - - /** - * Gets the value of a static or instance field of type - * {@code double} or of another primitive type convertible to - * type {@code double} via a widening conversion. - * - * @param obj the object to extract the {@code double} value - * from - * @return the value of the field converted to type {@code double} - * - * @exception IllegalAccessException if this {@code Field} object - * is enforcing Java language access control and the underlying - * field is inaccessible. - * @exception IllegalArgumentException if the specified object is not - * an instance of the class or interface declaring the - * underlying field (or a subclass or implementor - * thereof), or if the field value cannot be - * converted to the type {@code double} by a - * widening conversion. - * @exception NullPointerException if the specified object is null - * and the field is an instance field. - * @exception ExceptionInInitializerError if the initialization provoked - * by this method fails. - * @see Field#get - */ - public double getDouble(Object obj) - throws IllegalArgumentException, IllegalAccessException - { - return getFieldAccessor(obj).getDouble(obj); - } - - /** - * Sets the field represented by this {@code Field} object on the - * specified object argument to the specified new value. The new - * value is automatically unwrapped if the underlying field has a - * primitive type. - * - *
The operation proceeds as follows: - * - *
If the underlying field is static, the {@code obj} argument is - * ignored; it may be null. - * - *
Otherwise the underlying field is an instance field. If the - * specified object argument is null, the method throws a - * {@code NullPointerException}. If the specified object argument is not - * an instance of the class or interface declaring the underlying - * field, the method throws an {@code IllegalArgumentException}. - * - *
If this {@code Field} object is enforcing Java language access control, and - * the underlying field is inaccessible, the method throws an - * {@code IllegalAccessException}. - * - *
If the underlying field is final, the method throws an - * {@code IllegalAccessException} unless {@code setAccessible(true)} - * has succeeded for this {@code Field} object - * and the field is non-static. Setting a final field in this way - * is meaningful only during deserialization or reconstruction of - * instances of classes with blank final fields, before they are - * made available for access by other parts of a program. Use in - * any other context may have unpredictable effects, including cases - * in which other parts of a program continue to use the original - * value of this field. - * - *
If the underlying field is of a primitive type, an unwrapping - * conversion is attempted to convert the new value to a value of - * a primitive type. If this attempt fails, the method throws an - * {@code IllegalArgumentException}. - * - *
If, after possible unwrapping, the new value cannot be - * converted to the type of the underlying field by an identity or - * widening conversion, the method throws an - * {@code IllegalArgumentException}. - * - *
If the underlying field is static, the class that declared the - * field is initialized if it has not already been initialized. - * - *
The field is set to the possibly unwrapped and widened new value. - * - *
If the field is hidden in the type of {@code obj},
- * the field's value is set according to the preceding rules.
- *
- * @param obj the object whose field should be modified
- * @param value the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- */
- public void set(Object obj, Object value)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).set(obj, value);
- }
-
- /**
- * Sets the value of a field as a {@code boolean} on the specified object.
- * This method is equivalent to
- * {@code set(obj, zObj)},
- * where {@code zObj} is a {@code Boolean} object and
- * {@code zObj.booleanValue() == z}.
- *
- * @param obj the object whose field should be modified
- * @param z the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setBoolean(Object obj, boolean z)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setBoolean(obj, z);
- }
-
- /**
- * Sets the value of a field as a {@code byte} on the specified object.
- * This method is equivalent to
- * {@code set(obj, bObj)},
- * where {@code bObj} is a {@code Byte} object and
- * {@code bObj.byteValue() == b}.
- *
- * @param obj the object whose field should be modified
- * @param b the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setByte(Object obj, byte b)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setByte(obj, b);
- }
-
- /**
- * Sets the value of a field as a {@code char} on the specified object.
- * This method is equivalent to
- * {@code set(obj, cObj)},
- * where {@code cObj} is a {@code Character} object and
- * {@code cObj.charValue() == c}.
- *
- * @param obj the object whose field should be modified
- * @param c the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setChar(Object obj, char c)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setChar(obj, c);
- }
-
- /**
- * Sets the value of a field as a {@code short} on the specified object.
- * This method is equivalent to
- * {@code set(obj, sObj)},
- * where {@code sObj} is a {@code Short} object and
- * {@code sObj.shortValue() == s}.
- *
- * @param obj the object whose field should be modified
- * @param s the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setShort(Object obj, short s)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setShort(obj, s);
- }
-
- /**
- * Sets the value of a field as an {@code int} on the specified object.
- * This method is equivalent to
- * {@code set(obj, iObj)},
- * where {@code iObj} is a {@code Integer} object and
- * {@code iObj.intValue() == i}.
- *
- * @param obj the object whose field should be modified
- * @param i the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setInt(Object obj, int i)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setInt(obj, i);
- }
-
- /**
- * Sets the value of a field as a {@code long} on the specified object.
- * This method is equivalent to
- * {@code set(obj, lObj)},
- * where {@code lObj} is a {@code Long} object and
- * {@code lObj.longValue() == l}.
- *
- * @param obj the object whose field should be modified
- * @param l the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setLong(Object obj, long l)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setLong(obj, l);
- }
-
- /**
- * Sets the value of a field as a {@code float} on the specified object.
- * This method is equivalent to
- * {@code set(obj, fObj)},
- * where {@code fObj} is a {@code Float} object and
- * {@code fObj.floatValue() == f}.
- *
- * @param obj the object whose field should be modified
- * @param f the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setFloat(Object obj, float f)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setFloat(obj, f);
- }
-
- /**
- * Sets the value of a field as a {@code double} on the specified object.
- * This method is equivalent to
- * {@code set(obj, dObj)},
- * where {@code dObj} is a {@code Double} object and
- * {@code dObj.doubleValue() == d}.
- *
- * @param obj the object whose field should be modified
- * @param d the new value for the field of {@code obj}
- * being modified
- *
- * @exception IllegalAccessException if this {@code Field} object
- * is enforcing Java language access control and the underlying
- * field is either inaccessible or final.
- * @exception IllegalArgumentException if the specified object is not an
- * instance of the class or interface declaring the underlying
- * field (or a subclass or implementor thereof),
- * or if an unwrapping conversion fails.
- * @exception NullPointerException if the specified object is null
- * and the field is an instance field.
- * @exception ExceptionInInitializerError if the initialization provoked
- * by this method fails.
- * @see Field#set
- */
- public void setDouble(Object obj, double d)
- throws IllegalArgumentException, IllegalAccessException
- {
- getFieldAccessor(obj).setDouble(obj, d);
- }
-
- // Convenience routine which performs security checks
- private FieldAccessor getFieldAccessor(Object obj)
- throws IllegalAccessException
- {
- throw new SecurityException();
- }
-
- private static abstract class FieldAccessor {
- abstract void setShort(Object obj, short s);
- abstract void setInt(Object obj, int i);
- abstract void setChar(Object obj, char c);
- abstract void setByte(Object obj, byte b);
- abstract void setBoolean(Object obj, boolean z);
- abstract void set(Object obj, Object value);
- abstract double getDouble(Object obj);
- abstract void setLong(Object obj, long l);
- abstract void setFloat(Object obj, float f);
- abstract void setDouble(Object obj, double d);
- abstract long getLong(Object obj);
- abstract int getInt(Object obj);
- abstract short getShort(Object obj);
- abstract char getChar(Object obj);
- abstract byte getByte(Object obj);
- abstract boolean getBoolean(Object obj);
- abstract Object get(Object obj);
- abstract float getFloat(Object obj);
- }
-
- /*
- * Utility routine to paper over array type names
- */
- static String getTypeName(Class type) {
- if (type.isArray()) {
- try {
- Class cl = type;
- int dimensions = 0;
- while (cl.isArray()) {
- dimensions++;
- cl = cl.getComponentType();
- }
- StringBuffer sb = new StringBuffer();
- sb.append(cl.getName());
- for (int i = 0; i < dimensions; i++) {
- sb.append("[]");
- }
- return sb.toString();
- } catch (Throwable e) { /*FALLTHRU*/ }
- }
- return type.getName();
- }
-
- /**
- * @throws NullPointerException {@inheritDoc}
- * @since 1.5
- */
- public