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Merge pull request #222 from bivasdas/function
Imlemented Function
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| language: java | ||
| jdk: | ||
| - oraclejdk7 | ||
| - oraclejdk8 |
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jolt-core/src/main/java/com/bazaarvoice/jolt/templatr/function/Function.java
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| /* | ||
| * Copyright 2013 Bazaarvoice, Inc. | ||
| * | ||
| * 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 | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.bazaarvoice.jolt.templatr.function; | ||
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| import com.bazaarvoice.jolt.common.Optional; | ||
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| /** | ||
| * Templatr supports a Function on RHS that accepts jolt path expressions as arguments and evaluates | ||
| * them at runtime before calling it. Function always returns an Optional, and the value is written | ||
| * only if the optional is not empty. | ||
| * | ||
| * function spec is defined by "key": "=functionName(args...)" | ||
| * | ||
| * | ||
| * input: | ||
| * { "num": -1.0 } | ||
| * spec: | ||
| * { "num": "=abs(@(1,&0))" } | ||
| * will call the stock function Math.abs() and will pass the matching value at "num" | ||
| * | ||
| * spec: | ||
| * { "num": "=abs" } | ||
| * an alternative shortcut will do the same thing | ||
| * | ||
| * output: | ||
| * { "num": 1.0 } | ||
| * | ||
| * | ||
| * | ||
| * input: | ||
| * { "value": -1.0 } | ||
| * | ||
| * spec: | ||
| * { "absValue": "=abs(@(1,value))" } | ||
| * will evaluate the jolt path expression @(1,value) and pass the output to stock function Math.abs() | ||
| * | ||
| * output: | ||
| * { "value": -1.0, "absValue": 1.0 } | ||
| * | ||
| * | ||
| * | ||
| * Currently defined stock functions are: | ||
| * | ||
| * toLower - returns toLower value of toString() value of first arg, rest is ignored | ||
| * toUpper - returns toUpper value of toString() value of first arg, rest is ignored | ||
| * concat - concatenate all given arguments' toString() values | ||
| * | ||
| * minOf - returns the min of all numbers provided in the arguments, non-numbers are ignored | ||
| * maxOf - returns the max of all numbers provided in the arguments, non-numbers are ignored | ||
| * abs - returns the absolute value of first argument, rest is ignored | ||
| * toInteger - returns the intValue() value of first argument if its numeric, rest is ignored | ||
| * toDouble - returns the doubleValue() value of first argument if its numeric, rest is ignored | ||
| * toLong - returns the longValue() value of first argument if its numeric, rest is ignored | ||
| * | ||
| * All of these functions returns Optional.EMPTY if unsuccessful, which results in a no-op when performing | ||
| * the actual write in the json doc. | ||
| * | ||
| * i.e. | ||
| * input: | ||
| * { "value": "1.0" } --- note: string, not number | ||
| * | ||
| * spec: | ||
| * { "absValue": "=abs" } --- fails silently | ||
| * | ||
| * output: | ||
| * { "value": "1.0" } --- note: "absValue": null is not inserted | ||
| * | ||
| */ | ||
| public interface Function { | ||
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| public Optional<Object> apply(Object... args); | ||
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| } |
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