Method isBurning

src/main/java/net/minecraft/entity/Entity.java:2186–2190

Returns true if the entity is on fire. Used by render to add the fire effect on rendering.

()

     * Returns true if the entity is on fire. Used by render to add the fire effect on rendering.
     */
    public boolean isBurning()
    {
        boolean flag = this.worldObj != null && this.worldObj.isRemote;
        return !this.isImmuneToFire && (this.fire > 0 || flag && this.getFlag(0));
    }

    /**
     * Returns true if the entity is riding another entity, used by render to rotate the legs to be in 'sit' position