technology.tabula.writers.JSONWriter Maven / Gradle / Ivy
package technology.tabula.writers;
import java.io.IOException;
import java.lang.reflect.Modifier;
import java.util.List;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import technology.tabula.Cell;
import technology.tabula.RectangularTextContainer;
import technology.tabula.Table;
import technology.tabula.TextChunk;
import technology.tabula.json.RectangularTextContainerSerializer;
import technology.tabula.json.TableSerializer;
public class JSONWriter implements Writer {
private static final ExclusionStrategy ALLCLASSES_SKIPNONPUBLIC = new ExclusionStrategy() {
@Override public boolean shouldSkipClass(Class c) { return false; }
@Override public boolean shouldSkipField(FieldAttributes fa) { return !fa.hasModifier(Modifier.PUBLIC); }
};
@Override
public void write(Appendable out, Table table) throws IOException {
out.append(gson().toJson(table, Table.class));
}
@Override public void write(Appendable out, List tables) throws IOException {
Gson gson = gson();
JsonArray array = new JsonArray();
for (Table table : tables) array.add(gson.toJsonTree(table, Table.class));
out.append(gson.toJson(array));
}
private static Gson gson() {
return new GsonBuilder()
.addSerializationExclusionStrategy(ALLCLASSES_SKIPNONPUBLIC)
.registerTypeAdapter(Table.class, TableSerializer.INSTANCE)
.registerTypeAdapter(RectangularTextContainer.class, RectangularTextContainerSerializer.INSTANCE)
.registerTypeAdapter(Cell.class, RectangularTextContainerSerializer.INSTANCE)
.registerTypeAdapter(TextChunk.class, RectangularTextContainerSerializer.INSTANCE)
.create();
}
}
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