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/* Jackson JSON-processor.
 *
 * Copyright (c) 2007- Tatu Saloranta, [email protected]
 */

package com.fasterxml.jackson.core;

/**
 * Enumeration for basic token types used for returning results
 * of parsing JSON content.
 */
public enum JsonToken
{
    /* Some notes on implementation:
     *
     * - Entries are to be ordered such that start/end array/object
     *   markers come first, then field name marker (if any), and
     *   finally scalar value tokens. This is assumed by some
     *   typing checks.
     */

    /**
     * NOT_AVAILABLE can be returned if {@link JsonParser}
     * implementation can not currently return the requested
     * token (usually next one), or even if any will be
     * available, but that may be able to determine this in
     * future. This is the case with non-blocking parsers --
     * they can not block to wait for more data to parse and
     * must return something.
     */
    NOT_AVAILABLE(null, JsonTokenId.ID_NOT_AVAILABLE),

    /**
     * START_OBJECT is returned when encountering '{'
     * which signals starting of an Object value.
     */
    START_OBJECT("{", JsonTokenId.ID_START_OBJECT),
        
    /**
     * END_OBJECT is returned when encountering '}'
     * which signals ending of an Object value
     */
    END_OBJECT("}", JsonTokenId.ID_END_OBJECT),

    /**
     * START_ARRAY is returned when encountering '['
     * which signals starting of an Array value
     */
    START_ARRAY("[", JsonTokenId.ID_START_ARRAY),

    /**
     * END_ARRAY is returned when encountering ']'
     * which signals ending of an Array value
     */
    END_ARRAY("]", JsonTokenId.ID_END_ARRAY),
        
    /**
     * FIELD_NAME is returned when a String token is encountered
     * as a field name (same lexical value, different function)
     */
    FIELD_NAME(null, JsonTokenId.ID_FIELD_NAME),
    
    /**
     * Placeholder token returned when the input source has a concept
     * of embedded Object that are not accessible as usual structure
     * (of starting with {@link #START_OBJECT}, having values, ending with
     * {@link #END_OBJECT}), but as "raw" objects.
     *

* Note: this token is never returned by regular JSON readers, but * only by readers that expose other kinds of source (like * JsonNode-based JSON trees, Maps, Lists and such). */ VALUE_EMBEDDED_OBJECT(null, JsonTokenId.ID_EMBEDDED_OBJECT), /** * VALUE_STRING is returned when a String token is encountered * in value context (array element, field value, or root-level * stand-alone value) */ VALUE_STRING(null, JsonTokenId.ID_STRING), /** * VALUE_NUMBER_INT is returned when an integer numeric token is * encountered in value context: that is, a number that does * not have floating point or exponent marker in it (consists * only of an optional sign, followed by one or more digits; * or, for binary formats, is indicated as integral number * by internal representation). */ VALUE_NUMBER_INT(null, JsonTokenId.ID_NUMBER_INT), /** * VALUE_NUMBER_FLOAT is returned when a numeric token other * than integer is encountered: that is, a number that does * have floating point or exponent marker in it, in addition * to one or more digits (or, for non-textual formats, * has internal floating-point representation). */ VALUE_NUMBER_FLOAT(null, JsonTokenId.ID_NUMBER_FLOAT), /** * VALUE_TRUE is returned when encountering literal "true" in * value context */ VALUE_TRUE("true", JsonTokenId.ID_TRUE), /** * VALUE_FALSE is returned when encountering literal "false" in * value context */ VALUE_FALSE("false", JsonTokenId.ID_FALSE), /** * VALUE_NULL is returned when encountering literal "null" in * value context */ VALUE_NULL("null", JsonTokenId.ID_NULL), ; final String _serialized; final char[] _serializedChars; final byte[] _serializedBytes; final int _id; final boolean _isStructStart, _isStructEnd; final boolean _isNumber; final boolean _isBoolean; final boolean _isScalar; /** * @param token representation for this token, if there is a * single static representation; null otherwise */ JsonToken(String token, int id) { if (token == null) { _serialized = null; _serializedChars = null; _serializedBytes = null; } else { _serialized = token; _serializedChars = token.toCharArray(); // It's all in ascii, can just case... int len = _serializedChars.length; _serializedBytes = new byte[len]; for (int i = 0; i < len; ++i) { _serializedBytes[i] = (byte) _serializedChars[i]; } } _id = id; _isBoolean = (id == JsonTokenId.ID_FALSE || id == JsonTokenId.ID_TRUE); _isNumber = (id == JsonTokenId.ID_NUMBER_INT || id == JsonTokenId.ID_NUMBER_FLOAT); _isStructStart = (id == JsonTokenId.ID_START_OBJECT || id == JsonTokenId.ID_START_ARRAY); _isStructEnd = (id == JsonTokenId.ID_END_OBJECT || id == JsonTokenId.ID_END_ARRAY); _isScalar = !_isStructStart && !_isStructEnd && (id != JsonTokenId.ID_FIELD_NAME) && (id != JsonTokenId.ID_NOT_AVAILABLE); } public final int id() { return _id; } public final String asString() { return _serialized; } public final char[] asCharArray() { return _serializedChars; } public final byte[] asByteArray() { return _serializedBytes; } public final boolean isNumeric() { return _isNumber; } /** * Accessor that is functionally equivalent to: * * this == JsonToken.START_OBJECT || this == JsonToken.START_ARRAY * * * @since 2.3 */ public final boolean isStructStart() { return _isStructStart; } /** * Accessor that is functionally equivalent to: * * this == JsonToken.END_OBJECT || this == JsonToken.END_ARRAY * * * @since 2.3 */ public final boolean isStructEnd() { return _isStructEnd; } /** * Method that can be used to check whether this token represents * a valid non-structured value. This means all tokens other than * Object/Array start/end markers all field names. */ public final boolean isScalarValue() { return _isScalar; } public final boolean isBoolean() { return _isBoolean; } }





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