1 | /**
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2 | * @filedescription Merge Strategy
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3 | */
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4 |
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5 | "use strict";
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6 |
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7 | //-----------------------------------------------------------------------------
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8 | // Class
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9 | //-----------------------------------------------------------------------------
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10 |
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11 | /**
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12 | * Container class for several different merge strategies.
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13 | */
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14 | class MergeStrategy {
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15 |
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16 | /**
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17 | * Merges two keys by overwriting the first with the second.
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18 | * @param {*} value1 The value from the first object key.
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19 | * @param {*} value2 The value from the second object key.
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20 | * @returns {*} The second value.
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21 | */
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22 | static overwrite(value1, value2) {
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23 | return value2;
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24 | }
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25 |
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26 | /**
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27 | * Merges two keys by replacing the first with the second only if the
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28 | * second is defined.
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29 | * @param {*} value1 The value from the first object key.
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30 | * @param {*} value2 The value from the second object key.
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31 | * @returns {*} The second value if it is defined.
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32 | */
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33 | static replace(value1, value2) {
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34 | if (typeof value2 !== "undefined") {
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35 | return value2;
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36 | }
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37 |
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38 | return value1;
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39 | }
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40 |
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41 | /**
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42 | * Merges two properties by assigning properties from the second to the first.
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43 | * @param {*} value1 The value from the first object key.
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44 | * @param {*} value2 The value from the second object key.
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45 | * @returns {*} A new object containing properties from both value1 and
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46 | * value2.
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47 | */
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48 | static assign(value1, value2) {
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49 | return Object.assign({}, value1, value2);
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50 | }
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51 | }
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52 |
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53 | exports.MergeStrategy = MergeStrategy;
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