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diff --git a/README.md b/README.md new file mode 100644 index 0000000..52ff551 --- /dev/null +++ b/README.md @@ -0,0 +1,59 @@ +GeoJson POJOs for Jackson +========================= + +A small package of all GeoJson POJOs (Plain Old Java Objects) for serializing and +deserializing of objects via JSON Jackson Parser. + +Usage +----- + +If you know what kind of object you expect from a GeoJson file you can directly read it like this: + + +```java +FeatureCollection featureCollection = + new ObjectMapper().readValue(inputStream, FeatureCollection.class); +``` + +If you want to read any GeoJson file read the value as GeoJsonObject and then test for the contents via instanceOf: + +```java +GeoJsonObject object = new ObjectMapper().readValue(inputStream, GeoJsonObject.class); +if (object instanceof Polygon) { + ... +} else if (object instanceof Feature) { + ... +} +``` +and so on. + +Or you can use the GeoJsonObjectVisitor to visit the right method: + +```java +GeoJsonObject object = new ObjectMapper().readValue(inputStream, GeoJsonObject.class); +object.accept(visitor); +``` + + +Writing Json is even easier. You just have to create the GeoJson objects and pass them to the Jackson ObjectMapper. + +```java +FeatureCollection featureCollection = new FeatureCollection(); +featureCollection.add(new Feature()); + +String json= new ObjectMapper().writeValueAsString(featureCollection); +``` + +Maven Central +------------- + +You can find the library in the Maven Central Repository. + +```xml +<dependency> + <groupId>de.grundid.opendatalab</groupId> + <artifactId>geojson-jackson</artifactId> + <version>1.8.1</version> +</dependency> +``` + |