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Java 7+ toolkit to quickly develop RFC 4627 JSON compatible applications.
There is a newer version: 4.0.1
/* Copyright 2016 Clifton Labs

   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 org.json.simple;

/** Represents structural entities in JSON.
 * 
 * @since 2.0.0 */
class Yytoken{
    /** Represents the different kinds of tokens. */
    enum Types{
        /** Tokens of this type will always have a value of ":" */
        COLON,
        /** Tokens of this type will always have a value of "," */
        COMMA,
        /** Tokens of this type will always have a value that is a boolean, null, number, or string. */
        DATUM,
        /** Tokens of this type will always have a value of "" */
        END,
        /** Tokens of this type will always have a value of "{" */
        LEFT_BRACE,
        /** Tokens of this type will always have a value of "[" */
        LEFT_SQUARE,
        /** Tokens of this type will always have a value of "}" */
        RIGHT_BRACE,
        /** Tokens of this type will always have a value of "]" */
        RIGHT_SQUARE;
    }

    private final Types  type;
    private final Object value;

    /** @param type represents the kind of token the instantiated token will be.
     * @param value represents the value the token is associated with, will be ignored unless type is equal to
     *        Types.DATUM.
     * @see Types */
    Yytoken(final Types type, final Object value){
        /* Sanity check. Make sure the value is ignored for the proper value unless it is a datum token. */
        switch(type){
            case COLON:
                this.value = ":";
                break;
            case COMMA:
                this.value = ",";
                break;
            case END:
                this.value = "";
                break;
            case LEFT_BRACE:
                this.value = "{";
                break;
            case LEFT_SQUARE:
                this.value = "[";
                break;
            case RIGHT_BRACE:
                this.value = "}";
                break;
            case RIGHT_SQUARE:
                this.value = "]";
                break;
            default:
                this.value = value;
                break;
        }
        this.type = type;
    }

    /** @return which of the Types the token is.
     * @see Types */
    Types getType(){
        return this.type;
    }

    /** @return what the token is.
     * @see Types */
    Object getValue(){
        return this.value;
    }

    @Override
    public String toString(){
        final StringBuffer sb = new StringBuffer();
        sb.append(this.type.toString()).append("(").append(this.value).append(")");
        return sb.toString();
    }
}