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angular-join.js
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angular-join.js
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(function() {
'use strict';
function Join(q) {
/***************
* NORMALIZERS *
***************/
var normalizeHashFcn = function(hashFcn) {
if (typeof hashFcn == 'string' || hashFcn instanceof String) {
if (hashFcn instanceof String) {
hashFcn = hashFcn.valueOf();
}
return function(e) {
return e[hashFcn];
}
} else if (typeof hashFcn == 'object' && Array.isArray(hashFcn)) {
return function(e) {
return JSON.stringify(hashFcn.map(function(prop) {
return e[prop];
}));
}
} else {
return hashFcn;
}
};
var normalizeComparator = function(comparator, options) {
var stringCompare;
if (options && options.localeCompare) {
stringCompare = function(s1, s2) {
return s1.localeCompare(s2);
}
} else {
stringCompare = function(s1, s2) {
return s1 < s2 ? -1 : s1 > s2 ? 1 : 0;
}
}
if (typeof comparator == 'string' || comparator instanceof String) {
if (comparator instanceof String) {
comparator = comparator.valueOf();
}
return function(e1, e2) {
if (typeof e1[comparator] == 'string' || e1[comparator] instanceof String) {
return stringCompare(e1[comparator], e2[comparator]);
} else if (typeof e1[comparator].diff == 'function') {
return e1[comparator].diff(e2[comparator]);
} else {
return +e1[comparator] - +e2[comparator];
}
}
} else if (typeof comparator == 'object' && Array.isArray(comparator)) {
return function(e1, e2) {
var result = 0;
comparator.some(function(prop) {
if (typeof e1[prop] == 'string' || e1[prop] instanceof String) {
result = stringCompare(e1[prop], e2[prop]);
} else if (typeof e1[prop].diff == 'function') {
result = e1[prop].diff(e2[prop]);
} else {
result = +e1[prop] - +e2[prop];
}
return (result !== 0);
});
return result;
}
} else {
return comparator;
}
};
var normalizeSelect = function(callback) {
if (typeof callback == 'string' || callback instanceof String) {
return function(e) {
var result = {};
result[callback] = e[callback];
return result;
}
} else if (typeof callback == 'object' && Array.isArray(callback)) {
return function(e) {
return callback.reduce(function(prev, prop) {
prev[prop] = e[prop];
return prev;
}, {});
}
} else {
return callback;
}
};
/********
* JOIN *
********/
var mergeJoin = function(a2, comparator, callback, options) {
var a1 = this;
var a3 = [];
comparator = normalizeComparator(comparator, options);
if (!options || !options.sorted) {
a1 = a1.slice().sort(comparator);
a2 = a2.slice().sort(comparator);
}
var getContiguousLength = function(src, start) {
if (start < src.length) {
var i = start + 1;
while (i < src.length && comparator(src[start], src[i]) === 0) {
i++;
}
return i - start;
} else {
return 0;
}
};
var addLeft = function(start, end) {
for (var i = start; i < end; ++i) {
var newElement = callback(a1[i], null);
if (newElement) {
a3.push(newElement);
}
}
};
var addRight = function(start, end) {
for (var i = start; i < end; ++i) {
var newElement = callback(null, a2[i]);
if (newElement) {
a3.push(newElement);
}
}
};
var addCartesianJoin = function(start1, end1, start2, end2) {
for (var i1 = start1; i1 < end1; ++i1) {
for (var i2 = start2; i2 < end2; ++i2) {
var newElement = callback(a1[i1], a2[i2]);
if (newElement) {
a3.push(newElement);
}
}
}
};
var i1 = 0, i2 = 0;
if (a1.length && a2.length) {
var len1 = getContiguousLength(a1, i1);
var len2 = getContiguousLength(a2, i2);
while (i1 < a1.length && i2 < a2.length) {
var compare = comparator(a1[i1], a2[i2]);
if (compare === 0) {
addCartesianJoin(i1, i1 + len1, i2, i2 + len2);
i1 += len1;
i2 += len2;
len1 = getContiguousLength(a1, i1);
len2 = getContiguousLength(a2, i2);
} else if (compare < 0) {
addLeft(i1, i1 + len1);
i1 += len1;
len1 = getContiguousLength(a1, i1);
} else {
addRight(i2, i2 + len2);
i2 += len2;
len2 = getContiguousLength(a2, i2);
}
}
}
addLeft(i1, a1.length);
addRight(i2, a2.length);
return a3;
};
var hashJoin = function(a2, hashFcn, callback) {
var a1 = this;
var a3 = [];
var addCallback;
hashFcn = normalizeHashFcn(hashFcn);
var hashed, scanned;
if (a1.length < a2.length) {
hashed = a1;
scanned = a2;
addCallback = function(h, s) {
var newElement = callback(h, s);
if (newElement) {
a3.push(newElement);
}
};
} else {
hashed = a2;
scanned = a1;
addCallback = function(h, s) {
var newElement = callback(s, h);
if (newElement) {
a3.push(newElement);
}
};
}
if (hashed.length === 0) {
scanned.forEach(function(e) {
addCallback(null, e);
});
return a3;
} else if (scanned.length === 0) {
hashed.forEach(function(e) {
addCallback(e, null);
});
return a3;
}
var hashTable = {};
var hash, hashBucket;
for (var i = 0; i < hashed.length; ++i) {
var hashedEntry = hashed[i];
hash = hashFcn(hashedEntry, i, hashed);
hashBucket = hashTable[hash];
if (hashBucket) {
hashBucket.push({ used: false, e: hashedEntry });
} else {
hashTable[hash] = [{ used: false, e: hashedEntry }];
}
}
for (i = 0; i < scanned.length; i++) {
var scannedEntry = scanned[i];
hash = hashFcn(scannedEntry, i, scanned);
hashBucket = hashTable[hash];
if (hashBucket) {
hashBucket.forEach(function(hashedEntry) {
addCallback(hashedEntry.e, scannedEntry);
hashedEntry.used = true;
});
} else {
addCallback(null, scannedEntry);
}
}
Object.keys(hashTable).forEach(function(hash) {
hashTable[hash].forEach(function(hashedEntry) {
if (!hashedEntry.used) {
addCallback(hashedEntry.e, null);
}
});
});
return a3;
};
/************
* GROUP BY *
************/
var sortGroupBy = function(comparator, callback, options) {
var a = this;
var results = [];
if (a.length === 0) {
return results;
}
comparator = normalizeComparator(comparator, options);
if (!options || !options.sorted) {
a = a.slice().sort(comparator);
}
var grouped = callback(null, a[0]);
for (var i = 1; i < a.length; ++i) {
if (comparator(a[i-1], a[i]) === 0) {
grouped = callback(grouped, a[i]);
} else {
results.push(grouped);
grouped = callback(null, a[i]);
}
}
results.push(grouped);
return results;
};
var hashGroupBy = function(hashFcn, callback) {
var a = this;
if (a.length === 0) {
return [];
}
hashFcn = normalizeHashFcn(hashFcn);
var hashTable = {};
for (var i = 0; i < a.length; ++i) {
var e = a[i];
var hash = hashFcn(e, i, a);
var grouped = hashTable[hash];
hashTable[hash] = callback(grouped || null, e);
}
return Object.keys(hashTable).map(function(hash) {
return hashTable[hash];
});
};
/********************
* FLUENT INTERFACE *
********************/
var JoinQuery = function(input, op, params) {
this.a = input;
this.op = op;
this.params = params || [];
this.result = null;
this.mergeJoin = function(a2, comparator, callback, options) {
return new JoinQuery(this, mergeJoin, [a2, comparator, callback, options]);
};
this.hashJoin = function(a2, hashFcn, callback) {
return new JoinQuery(this, hashJoin, [a2, hashFcn, callback]);
};
this.sortGroupBy = function(comparator, callback, options) {
return new JoinQuery(this, sortGroupBy, [comparator, callback, options]);
};
this.hashGroupBy = function(hashFcn, callback) {
return new JoinQuery(this, hashGroupBy, [hashFcn, callback]);
};
this.map = function(callback) {
return new JoinQuery(this, Array.prototype.map, [normalizeSelect(callback)]);
};
this.select = function(callback) {
// just an alias for map
return this.map(callback);
};
this.filter = function(callback) {
return new JoinQuery(this, Array.prototype.filter, [callback]);
return query;
};
this.where = function(callback) {
// just an alias for filter
return this.filter(callback);
};
this.having = function(callback) {
// just an alias for filter
return this.filter(callback);
};
this.sort = function(comparator, options) {
return new JoinQuery(this, function sortCopy(comparator) {
return this.slice().sort(comparator);
}, [normalizeComparator(comparator, options)]);
};
this.orderBy = function(comparator, options) {
// just an alias for sort
return this.sort(comparator, options);
};
this.slice = function(begin, end) {
return new JoinQuery(this, Array.prototype.slice, [begin, end]);
};
this.limit = function(len, offset) {
offset = offset || 0;
return this.slice(offset, len + offset);
};
this.offset = function(offset) {
// just syntactic sugar for slice with 1 parameter
return this.slice(offset);
};
this.inspect = function(callback) {
return new JoinQuery(this, function(callback) {
callback(this);
return this;
}, [callback]);
};
var executeAsync = function(query, options) {
return q.all(query.params.map(function(param) {
if (param instanceof JoinQuery) {
return param.execute(options);
} else {
var deferred = q.defer();
deferred.resolve(param);
return deferred.promise;
}
})).then(function(params) {
if (!(options && options.force) && query.result !== null) {
return query.result;
} else if (query.a instanceof JoinQuery) {
return query.a.execute(options).then(function(results) {
if (!(options && options.force) && query.result !== null) {
return query.result;
} else {
query.result = results;
if (query.op) {
query.result = query.op.apply(query.result, params);
}
return query.result;
}
});
} else {
query.result = query.a;
if (query.op) {
query.result = query.op.apply(query.result, params);
}
return query.result;
}
});
};
var executeSync = function(query, options) {
if (!(options && options.force) && query.result !== null) {
return query.result;
} else {
var params = query.params.map(function(param) {
if (param instanceof JoinQuery) {
return param.execute(options);
} else {
return param;
}
});
if (query.a instanceof JoinQuery) {
query.result = query.a.execute(options);
} else {
query.result = query.a;
}
if (query.op) {
query.result = query.op.apply(query.result, params);
}
return query.result;
}
};
this.execute = function(options) {
if (options && options.async) {
return executeAsync(this, options);
} else {
return executeSync(this, options);
}
};
};
var selectFrom = function(input, selectCallback) {
var query = new JoinQuery(input);
if (selectCallback !== undefined && selectCallback !== null) {
query = query.select(selectCallback);
}
return query;
};
var queryWrapper = function(fcnName) {
// takes the 1st argument and uses it as 'this'
return function() {
var args = [];
for (var i = 1; i < arguments.length; i++) {
args.push(arguments[i]);
}
var query = selectFrom(arguments[0]);
return query[fcnName].apply(query, args).execute();
};
};
var service = { selectFrom: selectFrom };
// Add all the functions in a query (except inspect & execute) to the service
// so that they can be called statically
var proto = selectFrom([]);
Object.keys(selectFrom([])).forEach(function(key) {
var prop = proto[key];
if (['inspect', 'execute'].indexOf(key) < 0 && typeof prop == 'function') {
service[key] = queryWrapper(key);
}
});
return service;
}
if (typeof module === 'object' && typeof require === 'function') {
module.exports = Join(require('q'));
}
if (typeof angular === 'object' && typeof angular.module === 'function') {
angular.module('angular-join', [])
.factory('Join', ['$q', function($q) {
return Join($q);
}]);
}
}());