JSONBuffer (ELKI: Environment for DeveLoping KDD-Applications Supported by Index-Structures)

java.lang.Object
- de.lmu.ifi.dbs.elki.application.jsmap.JSONBuffer

```
public class JSONBuffer
extends Object
```
Helper class to produce JSON output. Try hard to ensure validity of the output.

Author:

Erich Schubert

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`JSONBuffer.JSONException` Class to represent JSON encoding exceptions.
`(package private) static class`	`JSONBuffer.Operand` Operations on the stack.

Field Summary

Fields
Modifier and Type	Field and Description
`(package private) StringBuilder`	`buffer` The actual buffer we serialize to
`(package private) Stack<JSONBuffer.Operand>`	`stack` Operations stack for detecting errors

Constructor Summary

Constructors
Constructor and Description

JSONBuffer(StringBuilder buffer)
Constructor.

Constructors
Constructor and Description
`JSONBuffer(StringBuilder buffer)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`private void`	`addQuotedString(Object cont)` Add a string in quotes.
`private void`	`addSeparator()` Add a separator
`JSONBuffer`	`append(double cont)` Append double
`JSONBuffer`	`append(double[] cont)` Append double array
`JSONBuffer`	`append(int cont)` Append integer
`JSONBuffer`	`append(int[] cont)` Append integer array
`JSONBuffer`	`appendKeyArray(Object key)` Append a key an start a new array
`JSONBuffer`	`appendKeyHash(Object key)` Append a key an start a new hash
`JSONBuffer`	`appendKeyValue(Object key, Object val)` Append a key-value pair as string.
`JSONBuffer`	`appendNewline()` Append a newline, for human readability
`JSONBuffer`	`appendString(Object cont)` Append a string in quotes
`JSONBuffer`	`closeArray()` Close an array context.
`JSONBuffer`	`closeHash()` Close an hash context.
`static String`	`jsonEscapeString(String orig)` String escaping for JSON
`private void`	`removeSeparator()` Remove a separator character if present
`JSONBuffer`	`startArray()` Start an array context.
`JSONBuffer`	`startHash()` Start an hash context.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - buffer
```
final StringBuilder buffer
```
    The actual buffer we serialize to
  - stack
```
final Stack<JSONBuffer.Operand> stack
```
    Operations stack for detecting errors
- Constructor Detail
  - JSONBuffer
```
public JSONBuffer(StringBuilder buffer)
```
    Constructor.
    
    Parameters:
    buffer - Buffer to serialize to
- Method Detail
  - jsonEscapeString
```
public static String jsonEscapeString(String orig)
```
    String escaping for JSON
    
    Parameters:
    orig - Original string
    
    Returns:
    JSON safe string
  - appendString
```
public JSONBuffer appendString(Object cont)
```
    Append a string in quotes
    
    Parameters:
    cont - Contents
    
    Returns:
    Buffer for chaining
  - append
```
public JSONBuffer append(double cont)
```
    Append double
    
    Parameters:
    cont - Contents
    
    Returns:
    Buffer for chaining
  - append
```
public JSONBuffer append(int cont)
```
    Append integer
    
    Parameters:
    cont - Contents
    
    Returns:
    Buffer for chaining
  - append
```
public JSONBuffer append(double[] cont)
```
    Append double array
    
    Parameters:
    cont - Contents
    
    Returns:
    Buffer for chaining
  - append
```
public JSONBuffer append(int[] cont)
```
    Append integer array
    
    Parameters:
    cont - Contents
    
    Returns:
    Buffer for chaining
  - addQuotedString
```
private void addQuotedString(Object cont)
```
    Add a string in quotes.
    
    Parameters:
    cont - Object to put as string
  - appendKeyValue
```
public JSONBuffer appendKeyValue(Object key,
                        Object val)
```
    Append a key-value pair as string.
    
    Parameters:
    key - Key to append
    val - Value to append
    
    Returns:
    Buffer for chaining
  - appendKeyHash
```
public JSONBuffer appendKeyHash(Object key)
```
    Append a key an start a new hash
    
    Parameters:
    key - Key to append
    
    Returns:
    Buffer for chaining
  - appendKeyArray
```
public JSONBuffer appendKeyArray(Object key)
```
    Append a key an start a new array
    
    Parameters:
    key - Key to append
    
    Returns:
    Buffer for chaining
  - startArray
```
public JSONBuffer startArray()
```
    Start an array context. Must only be called on an empty or array context.
    
    Returns:
    Buffer for chaining
  - startHash
```
public JSONBuffer startHash()
```
    Start an hash context. Must only be called on an empty or array context.
    
    Returns:
    Buffer for chaining
  - closeArray
```
public JSONBuffer closeArray()
```
    Close an array context.
    
    Returns:
    Buffer for chaining
  - closeHash
```
public JSONBuffer closeHash()
```
    Close an hash context.
    
    Returns:
    Buffer for chaining
  - removeSeparator
```
private void removeSeparator()
```
    Remove a separator character if present
  - addSeparator
```
private void addSeparator()
```
    Add a separator
  - appendNewline
```
public JSONBuffer appendNewline()
```
    Append a newline, for human readability
    
    Returns:
    Buffer for chaining

Class JSONBuffer

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

buffer

stack

Constructor Detail

JSONBuffer

Method Detail

jsonEscapeString

appendString

append

append

append

append

addQuotedString

appendKeyValue

appendKeyHash

appendKeyArray

startArray

startHash

closeArray

closeHash

removeSeparator

addSeparator

appendNewline