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Updated docs with properties.

pull/56/head
Kalle Stenflo 10 years ago
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d70b2525e0
  1. 59
      README.md

59
README.md

@ -211,7 +211,7 @@ Filter cheapFictionFilter = filter(where("category").is("fiction").and("price").
List<Map<String, Object>> books = parse(json).read("$.store.book[?]", cheapFictionFilter);
```
Note the placeholder '?' for the filter in the path. When multiple filters are provided they are applied in order where the number of placeholders must match
Notice the placeholder `?` for the filter in the path. When multiple filters are provided they are applied in order where the number of placeholders must match
the number of provided filters. You can specify multiple predicate placeholders in one filter operation `[?, ?]`, both predicates must match.
###Roll your own
@ -249,13 +249,68 @@ assertThat(pathList).containsExactly(
Tweaking Configuration
----------------------
###Options
When creating your Configuration there are a few option flags that can alter the default behaviour.
**DEFAULT_PATH_LEAF_TO_NULL**
This option makes JsonPath return null for missing leafs. Consider the following json
```javascript
[
{
"name" : "john",
"gender" : "male"
},
{
"name" : "ben"
}
]
```
```java
Configuration conf = Configuration.defaultConfiguration();
//Works fine
String gender0 = JsonPath.using(conf).read(json, "$[0]['gender']");
//PathNotFoundException thrown
String gender1 = JsonPath.using(conf).read(json, "$[1]['gender']");
Configuration conf2 = conf.addOptions(Option.DEFAULT_PATH_LEAF_TO_NULL);
//Works fine
String gender0 = JsonPath.using(conf2).read(json, "$[0]['gender']");
//Works fine (null is returned)
String gender1 = JsonPath.using(conf2).read(json, "$[1]['gender']");
```
**ALWAYS_RETURN_LIST**
This option configures JsonPath to return a list even when the path is `definite`.
```java
Configuration conf = Configuration.defaultConfiguration();
//Works fine
List<String> genders0 = JsonPath.using(conf).read(json, "$[0]['gender']");
//PathNotFoundException thrown
List<String> genders1 = JsonPath.using(conf).read(json, "$[1]['gender']");
```
**SUPPRESS_EXCEPTIONS**
This option makes sure no exceptions are propagated from path evaluation. It follows these simple rules:
* If option `ALWAYS_RETURN_LIST` is present an empty list will be returned
* If option `ALWAYS_RETURN_LIST` is **NOT** present null returned
###JsonProvider
JsonPath is shipped with three different JsonProviders:
* [JsonSmartJsonProvider](https://code.google.com/p/json-smart/) (default)
* [JacksonJsonProvider](https://github.com/FasterXML/jackson)
* [GsonJsonProvider](https://code.google.com/p/google-gson/) (experimental)
Changing the configuration defaults as demonstrated should only be done when your application is being initialized. Changes during runtime is strongly discouraged, especially in multi threaded applications.
Changing the configuration defaults as demonstrated should only be done when your application is being initialized. Changes during runtime is strongly discouraged, especially in multi threaded applications.
```java
Configuration.setDefaults(new Configuration.Defaults() {

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