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Groovy example source code file (JsonTokenType.java)

This example Groovy source code file (JsonTokenType.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

close_bracket, close_bracket, close_curly, comma, false, jsontokentype, jsontokentype, null, object, object, open_bracket, regex, string, string, true

The Groovy JsonTokenType.java source code

/*
 * Copyright 2003-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.json;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Enum listing all the possible JSON tokens that should be recognized by the lexer.
 *
 * @author Guillaume Laforge
 * @since 1.8.0
 */
public enum JsonTokenType {
    OPEN_CURLY      ( "an openning curly brace '{'",        "{"         ),
    CLOSE_CURLY     ( "a closing curly brace '}'",          "}"         ),
    OPEN_BRACKET    ( "an openning square bracket '['",     "["         ),
    CLOSE_BRACKET   ( "a closing square bracket ']'",       "]"         ),
    COLON           ( "a colon ':'",                        ":"         ),
    COMMA           ( "a comma ','",                        ","         ),
    NULL            ( "the constant 'null'",                "null"      ),
    TRUE            ( "the constant 'true'",                "true"      ),
    FALSE           ( "the constant 'false'",               "false"     ),
    NUMBER          ( "a number",                           Pattern.compile("-?\\d+(\\.\\d+)?((e|E)(\\+|-)?\\d+)?")),
    STRING          ( "a string",                           Pattern.compile("\"([^\"\\\\]*|\\\\[\"\\\\bfnrt\\/]|\\\\u[0-9a-fA-F]{4})*\"", Pattern.DOTALL));

    /**
     * A String constant or a Pattern, serving as a validator for matching tokens.
     */
    private Object validator;

    /**
     * A label describing the token
     */
    private String label;

    /**
     * Construct a token type with a label and a validator
     *
     * @param label a label describing the token
     * @param validator a String or Pattern validating input strings as valid tokens
     */
    JsonTokenType(String label, Object validator) {
        this.validator = validator;
        this.label = label;
    }

    /**
     * Tells if an input string matches a token.
     *
     * @param input the input string to match
     *
     * @return a <code>Matching enum value:
     * <code>YES if this is an exact match,
     * <code>POSSIBLE if more characters could turn the input string into a valid token,
     * or <code>NO if the string cannot possibly match the pattern even with more characters to read.
     */
    public boolean matching(String input) {
        if (validator instanceof Pattern) {
            Matcher matcher = ((Pattern)validator).matcher(input);
            return matcher.matches();
        } else if (validator instanceof String) {
            return input.equals(validator);
        } else {
            return false;
        }
    }

    /**
     * Find which JSON value might be starting with a given character
     *
     * @param c the character
     * @return the possible token type found
     */
    public static JsonTokenType startingWith(char c) {
        switch (c) {
            case '{': return OPEN_CURLY;
            case '}': return CLOSE_CURLY;
            case '[': return OPEN_BRACKET;
            case ']': return CLOSE_BRACKET;
            case ',': return COMMA;
            case ':': return COLON;

            case 't': return TRUE;
            case 'f': return FALSE;
            case 'n': return NULL;

            case '"': return STRING;

            case '-':
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
                return NUMBER;
        }
        return null;
    }

    public String getLabel() {
        return label;
    }

    public Object getValidator() {
        return validator;
    }
}

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