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Java JSON serialization
There is a newer version: 4.30.0
package com.cedarsoftware.io;

/**
 * This class is the parent class for all parsed JSON objects, arrays, or primitive values.
 *
 * @author John DeRegnaucourt ([email protected])
 *         

 *         Copyright (c) Cedar Software LLC
 *         


 *         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
 *         


 *         License
 *         


 *         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.
 */
public abstract class JsonValue {
    public static final String KEYS = "@keys";
    public static final String ITEMS = "@items";
    public static final String ID = "@id";
    public static final String REF = "@ref";
    public static final String TYPE = "@type";
    public static final String SHORT_TYPE = "@t";
    public static final String SHORT_ITEMS = "@e";
    public static final String SHORT_KEYS = "@k";
    public static final String SHORT_ID = "@i";
    public static final String SHORT_REF = "@r";
    public static final String VALUE = "value";
    protected Class javaType = null;
    protected Class hintType = null;
    protected Object target = null;
    protected boolean isFinished = false;
    protected long id = -1L;
    protected Long refId = null;
    protected int line;

    public int getLine() {
        return line;
    }

    public int getCol() {
        return col;
    }

    protected int col;

    public boolean isReference() {
        return refId != null;
    }

    public Long getReferenceId() {
        return refId;
    }

    public void setReferenceId(Long id) {
        refId = id;
    }

    public boolean isFinished() {
        return isFinished;
    }

    public void setFinished() {
        isFinished = true;
    }

    public void setTarget(Object target) {
        this.target = target;
        if (target != null) {
            this.javaType = target.getClass();
        }
    }

    public Object setFinishedTarget(Object o, boolean isFinished) {
        this.target = o;
        this.javaType = o.getClass();
        this.isFinished = isFinished;
        return this.target;
    }

    public Object getTarget() {
        return target;
    }

    abstract public boolean isArray();
    
    public Class getJavaType() {
        return javaType == null ? hintType : javaType;
    }

    public void setJavaType(Class type) {
        javaType = type;
        if (hintType == null) {
            hintType = type;
        }
    }

    public void setHintType(Class type) {
        this.hintType = type;
    }

    public String getJavaTypeName() {
        Class type = getJavaType();
        if (type == null) {
            return null;
        }
        return type.getName();
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    /**
     * A JsonObject starts off with an id of -1.  Also, an id of 0 is not considered a valid id.
     * It must be 1 or greater.  JsonWriter utilizes this fact.
     */
    public boolean hasId()
    {
        return id > 0L;
    }

    void clear()
    {
        id = -1;
        javaType = null;
        refId = null;
    }
}