ReaderBasedJsonParser (The Adobe AEM Quickstart and Web Application.)

java.lang.Object
- com.fasterxml.jackson.core.JsonParser
- - com.fasterxml.jackson.core.base.ParserMinimalBase
  - - com.fasterxml.jackson.core.base.ParserBase
    - - com.fasterxml.jackson.core.json.ReaderBasedJsonParser

All Implemented Interfaces:

Versioned, java.io.Closeable, java.lang.AutoCloseable
```
public class ReaderBasedJsonParser
extends ParserBase
```
This is a concrete implementation of JsonParser, which is based on a Reader to handle low-level character conversion tasks.

Nested Class Summary
- Nested classes/interfaces inherited from class com.fasterxml.jackson.core.JsonParser
  JsonParser.Feature, JsonParser.NumberType

Constructor Summary

Constructors
Constructor and Description
`ReaderBasedJsonParser(IOContext ctxt, int features, java.io.Reader r, ObjectCodec codec, CharsToNameCanonicalizer st)` Constructor called when input comes as a `Reader`, and buffer allocation can be done using default mechanism.
`ReaderBasedJsonParser(IOContext ctxt, int features, java.io.Reader r, ObjectCodec codec, CharsToNameCanonicalizer st, char[] inputBuffer, int start, int end, boolean bufferRecyclable)` Constructor called when caller wants to provide input buffer directly (or needs to, in case of bootstrapping having read some of contents) and it may or may not be recyclable use standard recycle context.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`finishToken()` Method that may be used to force full handling of the current token so that even if lazy processing is enabled, the whole contents are read for possible retrieval.
`byte[]`	`getBinaryValue(Base64Variant b64variant)` Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value.
`ObjectCodec`	`getCodec()` Accessor for `ObjectCodec` associated with this parser, if any.
`JsonLocation`	`getCurrentLocation()` Method that returns location of the last processed character; usually for error reporting purposes
`java.lang.Object`	`getInputSource()` Method that can be used to get access to object that is used to access input being parsed; this is usually either `InputStream` or `Reader`, depending on what parser was constructed with.
`JacksonFeatureSet<StreamReadCapability>`	`getReadCapabilities()` Accessor for getting metadata on capabilities of this parser, based on underlying data format being read (directly or indirectly).
`java.lang.String`	`getText()` Method for accessing textual representation of the current event; if no current event (before first call to `nextToken()`, or after encountering end-of-input), returns null.
`int`	`getText(java.io.Writer writer)` Method to read the textual representation of the current token in chunks and pass it to the given Writer.
`char[]`	`getTextCharacters()` Method similar to `JsonParser.getText()`, but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information.
`int`	`getTextLength()` Accessor used with `JsonParser.getTextCharacters()`, to know length of String stored in returned buffer.
`int`	`getTextOffset()` Accessor used with `JsonParser.getTextCharacters()`, to know offset of the first text content character within buffer.
`JsonLocation`	`getTokenLocation()` Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.
`java.lang.String`	`getValueAsString()` Method that will try to convert value of current token to a `String`.
`java.lang.String`	`getValueAsString(java.lang.String defValue)` Method that will try to convert value of current token to a `String`.
`java.lang.Boolean`	`nextBooleanValue()` Method that fetches next token (as if calling `JsonParser.nextToken()`) and if it is `JsonToken.VALUE_TRUE` or `JsonToken.VALUE_FALSE` returns matching Boolean value; otherwise return null.
`java.lang.String`	`nextFieldName()` Method that fetches next token (as if calling `JsonParser.nextToken()`) and verifies whether it is `JsonToken.FIELD_NAME`; if it is, returns same as `JsonParser.getCurrentName()`, otherwise null.
`boolean`	`nextFieldName(SerializableString sstr)` Method that fetches next token (as if calling `JsonParser.nextToken()`) and verifies whether it is `JsonToken.FIELD_NAME` with specified name and returns result of that comparison.
`int`	`nextIntValue(int defaultValue)` Method that fetches next token (as if calling `JsonParser.nextToken()`) and if it is `JsonToken.VALUE_NUMBER_INT` returns 32-bit int value; otherwise returns specified default value It is functionally equivalent to:
`long`	`nextLongValue(long defaultValue)` Method that fetches next token (as if calling `JsonParser.nextToken()`) and if it is `JsonToken.VALUE_NUMBER_INT` returns 64-bit long value; otherwise returns specified default value It is functionally equivalent to:
`java.lang.String`	`nextTextValue()` Method that fetches next token (as if calling `JsonParser.nextToken()`) and if it is `JsonToken.VALUE_STRING` returns contained String value; otherwise returns null.
`JsonToken`	`nextToken()` Main iteration method, which will advance stream enough to determine type of the next token, if any.
`int`	`readBinaryValue(Base64Variant b64variant, java.io.OutputStream out)` Similar to `JsonParser.readBinaryValue(OutputStream)` but allows explicitly specifying base64 variant to use.
`int`	`releaseBuffered(java.io.Writer w)` Method that can be called to push back any content that has been read but not consumed by the parser.
`void`	`setCodec(ObjectCodec c)` Setter that allows defining `ObjectCodec` associated with this parser, if any.

Methods inherited from class com.fasterxml.jackson.core.base.ParserBase
_getByteArrayBuilder, close, disable, enable, getBigIntegerValue, getCurrentName, getCurrentValue, getDecimalValue, getDoubleValue, getFloatValue, getIntValue, getLongValue, getNumberType, getNumberValue, getNumberValueExact, getParsingContext, getTokenCharacterOffset, getTokenColumnNr, getTokenLineNr, hasTextCharacters, isClosed, isNaN, overrideCurrentName, overrideStdFeatures, setCurrentValue, setFeatureMask, version

Methods inherited from class com.fasterxml.jackson.core.base.ParserMinimalBase
clearCurrentToken, currentToken, currentTokenId, getCurrentToken, getCurrentTokenId, getLastClearedToken, getValueAsBoolean, getValueAsDouble, getValueAsInt, getValueAsInt, getValueAsLong, getValueAsLong, hasCurrentToken, hasToken, hasTokenId, isExpectedNumberIntToken, isExpectedStartArrayToken, isExpectedStartObjectToken, nextValue, skipChildren

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

- Constructor Detail
  - ReaderBasedJsonParser
```
public ReaderBasedJsonParser(IOContext ctxt,
                             int features,
                             java.io.Reader r,
                             ObjectCodec codec,
                             CharsToNameCanonicalizer st,
                             char[] inputBuffer,
                             int start,
                             int end,
                             boolean bufferRecyclable)
```
    Constructor called when caller wants to provide input buffer directly (or needs to, in case of bootstrapping having read some of contents) and it may or may not be recyclable use standard recycle context.
    
    Parameters:
    
    ctxt - I/O context to use
    
    features - Standard stream read features enabled
    
    r - Reader used for reading actual content, if any; null if none
    
    codec - ObjectCodec to delegate object deserialization to
    
    st - Name canonicalizer to use
    
    inputBuffer - Input buffer to read initial content from (before Reader)
    
    start - Pointer in inputBuffer that has the first content character to decode
    
    end - Pointer past the last content character in inputBuffer
    
    bufferRecyclable - Whether inputBuffer passed is managed by Jackson core (and thereby needs recycling)
    
    Since:
    
    2.4
  - ReaderBasedJsonParser
```
public ReaderBasedJsonParser(IOContext ctxt,
                             int features,
                             java.io.Reader r,
                             ObjectCodec codec,
                             CharsToNameCanonicalizer st)
```
    Constructor called when input comes as a Reader, and buffer allocation can be done using default mechanism.
    
    Parameters:
    
    ctxt - I/O context to use
    
    features - Standard stream read features enabled
    
    r - Reader used for reading actual content, if any; null if none
    
    codec - ObjectCodec to delegate object deserialization to
    
    st - Name canonicalizer to use
- Method Detail
  - getCodec
```
public ObjectCodec getCodec()
```
    Description copied from class: JsonParser
    
    Accessor for ObjectCodec associated with this parser, if any. Codec is used by JsonParser.readValueAs(Class) method (and its variants).
    
    Specified by:
    
    getCodec in class JsonParser
    
    Returns:
    
    Codec assigned to this parser, if any; null if none
  - setCodec
```
public void setCodec(ObjectCodec c)
```
    Description copied from class: JsonParser
    
    Setter that allows defining ObjectCodec associated with this parser, if any. Codec is used by JsonParser.readValueAs(Class) method (and its variants).
    
    Specified by:
    
    setCodec in class JsonParser
    
    Parameters:
    
    c - Codec to assign, if any; null if none
  - getReadCapabilities
```
public JacksonFeatureSet<StreamReadCapability> getReadCapabilities()
```
    Description copied from class: JsonParser
    
    Accessor for getting metadata on capabilities of this parser, based on underlying data format being read (directly or indirectly).
    
    Overrides:
    
    getReadCapabilities in class JsonParser
    
    Returns:
    
    Set of read capabilities for content to read via this parser
  - releaseBuffered
```
public int releaseBuffered(java.io.Writer w)
                    throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that can be called to push back any content that has been read but not consumed by the parser. This is usually done after reading all content of interest using parser. Content is released by writing it to given writer if possible; if underlying input is char-based it can released, if not (byte-based) it can not.
    
    Overrides:
    
    releaseBuffered in class JsonParser
    
    Parameters:
    
    w - Writer to which buffered but unprocessed content is written to
    
    Returns:
    
    -1 if the underlying content source is not char-based (that is, input can not be sent to Writer; otherwise number of chars released (0 if there was nothing to release)
    
    Throws:
    
    java.io.IOException - if write using Writer threw exception
  - getInputSource
```
public java.lang.Object getInputSource()
```
    Description copied from class: JsonParser
    
    Method that can be used to get access to object that is used to access input being parsed; this is usually either InputStream or Reader, depending on what parser was constructed with. Note that returned value may be null in some cases; including case where parser implementation does not want to exposed raw source to caller. In cases where input has been decorated, object returned here is the decorated version; this allows some level of interaction between users of parser and decorator object.
    In general use of this accessor should be considered as "last effort", i.e. only used if no other mechanism is applicable.
    
    Overrides:
    
    getInputSource in class JsonParser
    
    Returns:
    
    Input source this parser was configured with
  - getText
```
public final java.lang.String getText()
                               throws java.io.IOException
```
    Method for accessing textual representation of the current event; if no current event (before first call to nextToken(), or after encountering end-of-input), returns null. Method can be called for any event.
    
    Specified by:
    
    getText in class ParserMinimalBase
    
    Returns:
    
    Textual value associated with the current token (one returned by JsonParser.nextToken() or other iteration methods)
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getText
```
public int getText(java.io.Writer writer)
            throws java.io.IOException
```
    Description copied from class: JsonParser
    Method to read the textual representation of the current token in chunks and pass it to the given Writer. Conceptually same as calling:
```
  writer.write(parser.getText());
```
    but should typically be more efficient as longer content does need to be combined into a single String to return, and write can occur directly from intermediate buffers Jackson uses.
    Overrides:
    
    getText in class JsonParser
    
    Parameters:
    
    writer - Writer to write textual content to
    
    Returns:
    
    The number of characters written to the Writer
    
    Throws:
    
    java.io.IOException - for low-level read issues or writes using passed writer, or JsonParseException for decoding problems
  - getValueAsString
```
public final java.lang.String getValueAsString()
                                        throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that will try to convert value of current token to a String. JSON Strings map naturally; scalar values get converted to their textual representation. If representation can not be converted to a String value (including structured types like Objects and Arrays and null token), default value of null will be returned; no exceptions are thrown.
    
    Overrides:
    
    getValueAsString in class ParserMinimalBase
    
    Returns:
    
    String value current token is converted to, if possible; null otherwise
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getValueAsString
```
public final java.lang.String getValueAsString(java.lang.String defValue)
                                        throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that will try to convert value of current token to a String. JSON Strings map naturally; scalar values get converted to their textual representation. If representation can not be converted to a String value (including structured types like Objects and Arrays and null token), specified default value will be returned; no exceptions are thrown.
    
    Overrides:
    
    getValueAsString in class ParserMinimalBase
    
    Parameters:
    
    defValue - Default value to return if conversion to String is not possible
    
    Returns:
    
    String value current token is converted to, if possible; def otherwise
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getTextCharacters
```
public final char[] getTextCharacters()
                               throws java.io.IOException
```
    Description copied from class: JsonParser
    Method similar to JsonParser.getText(), but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information. Note, however, that:
    - Textual contents are not guaranteed to start at index 0 (rather, call JsonParser.getTextOffset()) to know the actual offset
    - Length of textual contents may be less than the length of returned buffer: call JsonParser.getTextLength() for actual length of returned content.
    Note that caller MUST NOT modify the returned character array in any way -- doing so may corrupt current parser state and render parser instance useless.
    The only reason to call this method (over JsonParser.getText()) is to avoid construction of a String object (which will make a copy of contents).
    Specified by:
    
    getTextCharacters in class ParserMinimalBase
    
    Returns:
    
    Buffer that contains the current textual value (but not necessarily at offset 0, and not necessarily until the end of buffer)
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getTextLength
```
public final int getTextLength()
                        throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Accessor used with JsonParser.getTextCharacters(), to know length of String stored in returned buffer.
    
    Specified by:
    
    getTextLength in class ParserMinimalBase
    
    Returns:
    
    Number of characters within buffer returned by JsonParser.getTextCharacters() that are part of textual content of the current token.
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getTextOffset
```
public final int getTextOffset()
                        throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Accessor used with JsonParser.getTextCharacters(), to know offset of the first text content character within buffer.
    
    Specified by:
    
    getTextOffset in class ParserMinimalBase
    
    Returns:
    
    Offset of the first character within buffer returned by JsonParser.getTextCharacters() that is part of textual content of the current token.
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getBinaryValue
```
public byte[] getBinaryValue(Base64Variant b64variant)
                      throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value. It works similar to getting String value via JsonParser.getText() and decoding result (except for decoding part), but should be significantly more performant.
    Note that non-decoded textual contents of the current token are not guaranteed to be accessible after this method is called. Current implementation, for example, clears up textual content during decoding. Decoded binary content, however, will be retained until parser is advanced to the next event.
    
    Overrides:
    
    getBinaryValue in class ParserBase
    
    Parameters:
    
    b64variant - Expected variant of base64 encoded content (see Base64Variants for definitions of "standard" variants).
    
    Returns:
    
    Decoded binary data
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - readBinaryValue
```
public int readBinaryValue(Base64Variant b64variant,
                           java.io.OutputStream out)
                    throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Similar to JsonParser.readBinaryValue(OutputStream) but allows explicitly specifying base64 variant to use.
    
    Overrides:
    
    readBinaryValue in class JsonParser
    
    Parameters:
    
    b64variant - base64 variant to use
    
    out - Output stream to use for passing decoded binary data
    
    Returns:
    
    Number of bytes that were decoded and written via OutputStream
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - nextToken
```
public final JsonToken nextToken()
                          throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Main iteration method, which will advance stream enough to determine type of the next token, if any. If none remaining (stream has no content other than possible white space before ending), null will be returned.
    
    Specified by:
    
    nextToken in class ParserMinimalBase
    
    Returns:
    
    Next token from the stream, if any found, or null to indicate end-of-input
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - finishToken
```
public void finishToken()
                 throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that may be used to force full handling of the current token so that even if lazy processing is enabled, the whole contents are read for possible retrieval. This is usually used to ensure that the token end location is available, as well as token contents (similar to what calling, say JsonParser.getTextCharacters(), would achieve).
    Note that for many dataformat implementations this method will not do anything; this is the default implementation unless overridden by sub-classes.
    
    Overrides:
    
    finishToken in class JsonParser
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - nextFieldName
```
public boolean nextFieldName(SerializableString sstr)
                      throws java.io.IOException
```
    Description copied from class: JsonParser
    Method that fetches next token (as if calling JsonParser.nextToken()) and verifies whether it is JsonToken.FIELD_NAME with specified name and returns result of that comparison. It is functionally equivalent to:
```
  return (nextToken() == JsonToken.FIELD_NAME) && str.getValue().equals(getCurrentName());
```
    but may be faster for parser to verify, and can therefore be used if caller expects to get such a property name from input next.
    Overrides:
    
    nextFieldName in class JsonParser
    
    Parameters:
    
    sstr - Property name to compare next token to (if next token is JsonToken.FIELD_NAME)
    
    Returns:
    
    True if parser advanced to JsonToken.FIELD_NAME with specified name; false otherwise (different token or non-matching name)
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - nextFieldName
```
public java.lang.String nextFieldName()
                               throws java.io.IOException
```
    Description copied from class: JsonParser
    
    Method that fetches next token (as if calling JsonParser.nextToken()) and verifies whether it is JsonToken.FIELD_NAME; if it is, returns same as JsonParser.getCurrentName(), otherwise null.
    
    Overrides:
    
    nextFieldName in class JsonParser
    
    Returns:
    
    Name of the the JsonToken.FIELD_NAME parser advanced to, if any; null if next token is of some other type
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - nextTextValue
```
public final java.lang.String nextTextValue()
                                     throws java.io.IOException
```
    Description copied from class: JsonParser
    Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_STRING returns contained String value; otherwise returns null. It is functionally equivalent to:
```
  return (nextToken() == JsonToken.VALUE_STRING) ? getText() : null;
```
    but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.
    Overrides:
    
    nextTextValue in class JsonParser
    
    Returns:
    
    Text value of the JsonToken.VALUE_STRING token parser advanced to; or null if next token is of some other type
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - nextIntValue
```
public final int nextIntValue(int defaultValue)
                       throws java.io.IOException
```
    Description copied from class: JsonParser
    Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 32-bit int value; otherwise returns specified default value It is functionally equivalent to:
```
  return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getIntValue() : defaultValue;
```
    but may be faster for parser to process, and can therefore be used if caller expects to get an int value next from input.
    NOTE: value checks are performed similar to JsonParser.getIntValue()
    Overrides:
    
    nextIntValue in class JsonParser
    
    Parameters:
    
    defaultValue - Value to return if next token is NOT of type JsonToken.VALUE_NUMBER_INT
    
    Returns:
    
    Integer (int) value of the JsonToken.VALUE_NUMBER_INT token parser advanced to; or defaultValue if next token is of some other type
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
    
    InputCoercionException - if integer number does not fit in Java int
  - nextLongValue
```
public final long nextLongValue(long defaultValue)
                         throws java.io.IOException
```
    Description copied from class: JsonParser
    Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 64-bit long value; otherwise returns specified default value It is functionally equivalent to:
```
  return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getLongValue() : defaultValue;
```
    but may be faster for parser to process, and can therefore be used if caller expects to get a long value next from input.
    NOTE: value checks are performed similar to JsonParser.getLongValue()
    Overrides:
    
    nextLongValue in class JsonParser
    
    Parameters:
    
    defaultValue - Value to return if next token is NOT of type JsonToken.VALUE_NUMBER_INT
    
    Returns:
    
    long value of the JsonToken.VALUE_NUMBER_INT token parser advanced to; or defaultValue if next token is of some other type
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
    
    InputCoercionException - if integer number does not fit in Java long
  - nextBooleanValue
```
public final java.lang.Boolean nextBooleanValue()
                                         throws java.io.IOException
```
    Description copied from class: JsonParser
    Method that fetches next token (as if calling JsonParser.nextToken()) and if it is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE returns matching Boolean value; otherwise return null. It is functionally equivalent to:
```
  JsonToken t = nextToken();
  if (t == JsonToken.VALUE_TRUE) return Boolean.TRUE;
  if (t == JsonToken.VALUE_FALSE) return Boolean.FALSE;
  return null;
```
    but may be faster for parser to process, and can therefore be used if caller expects to get a Boolean value next from input.
    Overrides:
    
    nextBooleanValue in class JsonParser
    
    Returns:
    
    Boolean value of the JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE token parser advanced to; or null if next token is of some other type
    
    Throws:
    
    java.io.IOException - for low-level read issues, or JsonParseException for decoding problems
  - getTokenLocation
```
public JsonLocation getTokenLocation()
```
    Description copied from class: ParserBase
    
    Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.
    
    Overrides:
    
    getTokenLocation in class ParserBase
    
    Returns:
    
    Starting location of the token parser currently points to
  - getCurrentLocation
```
public JsonLocation getCurrentLocation()
```
    Description copied from class: ParserBase
    
    Method that returns location of the last processed character; usually for error reporting purposes
    
    Overrides:
    
    getCurrentLocation in class ParserBase
    
    Returns:
    
    Location of the last processed input unit (byte or character)

Class ReaderBasedJsonParser

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.core.JsonParser

Constructor Summary

Method Summary

Methods inherited from class com.fasterxml.jackson.core.base.ParserBase

Methods inherited from class com.fasterxml.jackson.core.base.ParserMinimalBase

Methods inherited from class com.fasterxml.jackson.core.JsonParser

Methods inherited from class java.lang.Object

Constructor Detail

ReaderBasedJsonParser

ReaderBasedJsonParser

Method Detail

getCodec

setCodec

getReadCapabilities

releaseBuffered

getInputSource

getText

getText

getValueAsString

getValueAsString

getTextCharacters

getTextLength

getTextOffset

getBinaryValue

readBinaryValue

nextToken

finishToken

nextFieldName

nextFieldName

nextTextValue

nextIntValue

nextLongValue

nextBooleanValue

getTokenLocation

getCurrentLocation