SpatialDataType (H2 Database Engine wt-1.0.1 API)

java.lang.Object
- org.h2.mvstore.rtree.SpatialDataType

所有已实现的接口:

DataType
```
public class SpatialDataType
extends Object
implements DataType
```
A spatial data type. This class supports up to 31 dimensions. Each dimension can have a minimum and a maximum value of type float. For each dimension, the maximum value is only stored when it is not the same as the minimum.

构造器概要

构造器
构造器和说明

SpatialDataType(int dimensions)

构造器
构造器和说明
`SpatialDataType(int dimensions)`

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`int`	`compare(Object a, Object b)` Compare two keys.
`boolean`	`contains(Object objA, Object objB)` Check whether a contains b.
`boolean`	`equals(Object a, Object b)` Check whether two spatial values are equal.
`float`	`getAreaIncrease(Object objA, Object objB)` Get the area increase by extending a to contain b.
`int[]`	`getExtremes(ArrayList<Object> list)` Get the most extreme pair (elements that are as far apart as possible).
`int`	`getMemory(Object obj)` Estimate the used memory in bytes.
`void`	`increaseBounds(Object bounds, Object add)` Increase the bounds in the given spatial object.
`boolean`	`isInside(Object objA, Object objB)` Check whether a is completely inside b and does not touch the given bound.
`boolean`	`isOverlap(Object objA, Object objB)` Check whether the two objects overlap.
`Object`	`read(ByteBuffer buff)` Read an object.
`void`	`read(ByteBuffer buff, Object[] obj, int len, boolean key)` Read a list of objects.
`void`	`write(WriteBuffer buff, Object obj)` Write an object.
`void`	`write(WriteBuffer buff, Object[] obj, int len, boolean key)` Write a list of objects.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - SpatialDataType
```
public SpatialDataType(int dimensions)
```
- 方法详细资料
  - compare
```
public int compare(Object a,
                   Object b)
```
    从接口复制的说明: DataType
    
    Compare two keys.
    
    指定者:
    
    compare 在接口中 DataType
    
    参数:
    
    a - the first key
    
    b - the second key
    
    返回:
    
    -1 if the first key is smaller, 1 if larger, and 0 if equal
  - equals
```
public boolean equals(Object a,
                      Object b)
```
    Check whether two spatial values are equal.
    
    参数:
    
    a - the first value
    
    b - the second value
    
    返回:
    
    true if they are equal
  - getMemory
```
public int getMemory(Object obj)
```
    从接口复制的说明: DataType
    
    Estimate the used memory in bytes.
    
    指定者:
    
    getMemory 在接口中 DataType
    
    参数:
    
    obj - the object
    
    返回:
    
    the used memory
  - read
```
public void read(ByteBuffer buff,
                 Object[] obj,
                 int len,
                 boolean key)
```
    从接口复制的说明: DataType
    
    Read a list of objects.
    
    指定者:
    
    read 在接口中 DataType
    
    参数:
    
    buff - the target buffer
    
    obj - the objects
    
    len - the number of objects to read
    
    key - whether the objects are keys
  - write
```
public void write(WriteBuffer buff,
                  Object[] obj,
                  int len,
                  boolean key)
```
    从接口复制的说明: DataType
    
    Write a list of objects.
    
    指定者:
    
    write 在接口中 DataType
    
    参数:
    
    buff - the target buffer
    
    obj - the objects
    
    len - the number of objects to write
    
    key - whether the objects are keys
  - write
```
public void write(WriteBuffer buff,
                  Object obj)
```
    从接口复制的说明: DataType
    
    Write an object.
    
    指定者:
    
    write 在接口中 DataType
    
    参数:
    
    buff - the target buffer
    
    obj - the value
  - read
```
public Object read(ByteBuffer buff)
```
    从接口复制的说明: DataType
    
    Read an object.
    
    指定者:
    
    read 在接口中 DataType
    
    参数:
    
    buff - the source buffer
    
    返回:
    
    the object
  - isOverlap
```
public boolean isOverlap(Object objA,
                         Object objB)
```
    Check whether the two objects overlap.
    
    参数:
    
    objA - the first object
    
    objB - the second object
    
    返回:
    
    true if they overlap
  - increaseBounds
```
public void increaseBounds(Object bounds,
                           Object add)
```
    Increase the bounds in the given spatial object.
    
    参数:
    
    bounds - the bounds (may be modified)
    
    add - the value
  - getAreaIncrease
```
public float getAreaIncrease(Object objA,
                             Object objB)
```
    Get the area increase by extending a to contain b.
    
    参数:
    
    objA - the bounding box
    
    objB - the object
    
    返回:
    
    the area
  - contains
```
public boolean contains(Object objA,
                        Object objB)
```
    Check whether a contains b.
    
    参数:
    
    objA - the bounding box
    
    objB - the object
    
    返回:
    
    the area
  - isInside
```
public boolean isInside(Object objA,
                        Object objB)
```
    Check whether a is completely inside b and does not touch the given bound.
    
    参数:
    
    objA - the object to check
    
    objB - the bounds
    
    返回:
    
    true if a is completely inside b
  - getExtremes
```
public int[] getExtremes(ArrayList<Object> list)
```
    Get the most extreme pair (elements that are as far apart as possible). This method is used to split a page (linear split). If no extreme objects could be found, this method returns null.
    
    参数:
    
    list - the objects
    
    返回:
    
    the indexes of the extremes

类 SpatialDataType

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

SpatialDataType

方法详细资料

compare

equals

getMemory

read

write

write

read

isOverlap

increaseBounds

getAreaIncrease

contains

isInside

getExtremes