deserialize Jackson object in JavaScript containing JsonIdentityInfo

Solution 1:

I recently came across an exact scenario that OP has described here. Below was my solution. Use JSOG (Javascript Object Graph) format to solve this.

Server Side Use Jackson-Jsog plugin https://github.com/jsog/jsog-jackson and annotate each class using below annotation.

@JsonIdentityInfo(generator=JSOGGenerator.class)

instead of the

@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@id")

this would generate in JSOG format. (@id and @ref)

On the Client Side, use the jsog.js

convert the JSOG structure to the cyclic one using the below call

cyclicGraph = JSOG.decode(jsogStructure);

Solution 2:

Split all the array members into new arrays: those with a full component attribute (not just a number) and those without. Loop through the remaining original members which should have just numerical component attributes, then look up the corresponding @componentID from the "good" array, and do some copying and moving.

// initialize some vars
var final = [], temp = [], bad = [],
    c = {},
    computers = [
      {
        "@computerID": 1,
        "component": {
          "@componentID": 2,
          "processor": 2,
          "ram": "8g",
          "harddrive": "wd"
        }
      },
      {
        "@computerID": 3,
        "component": 2
      }
    ];

// split original array into 3: final, bad, & temp
while(computers.length > 0) {
    c = computers.pop();
    if (c.hasOwnProperty("component")) {
        if (typeof c.component === "number") {
            temp.push(c);
        } else {
            final.push(c);
        }
    } else {
        bad.push(c);
    }
}

// loop through temp & look up @componentID within final
while (temp.length > 0) {
    c = temp.pop();
    // should @componentID be 1-of-a-kind?
    var found = getObjects(final, "@componentID", c.component);
    if (found.length) {
        c.component = found[0];
        final.push(c);
    } else {
        bad.push(c);
    }
}


// SOURCE: http://stackoverflow.com/a/4992429/1072176
function getObjects(obj, key, val) {
    var objects = [];
    for (var i in obj) {
        if (!obj.hasOwnProperty(i)) continue;
        if (typeof obj[i] == 'object') {
            objects = objects.concat(getObjects(obj[i], key, val));
        } else if (i == key && obj[key] == val) {
            objects.push(obj);
        }
    }
    return objects;
}

// should result in just one or two populated arrays: final and/or bad
alert(JSON.stringify(final));

You'll note I actually made THREE arrays, but only two end up populated: final has your good new objects, and the other one (bad) is a catch-all for objects without a component attribute, or for whose component number a corresponding @componentID cannot be found.