de.lmu.ifi.dbs.elki.application.jsmap
Class JSONBuffer

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.

Nested Class Summary

static class	JSONBuffer.JSONException Class to represent JSON encoding exceptions.
(package private) static class	JSONBuffer.ops Operations on the stack.

Field Summary

(package private) StringBuffer	buffer The actual buffer we serialize to
(package private) Stack<JSONBuffer.ops>	stack Operations stack for detecting errors

Constructor Summary

JSONBuffer(StringBuffer buffer)
Constructor.

Method Summary

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 StringBuffer buffer

The actual buffer we serialize to

stack

final Stack<JSONBuffer.ops> stack

Operations stack for detecting errors

Constructor Detail

JSONBuffer

public JSONBuffer(StringBuffer 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