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io.ebeaninternal.json.EJsonWriter Maven / Gradle / Ivy
package io.ebeaninternal.json;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collection;
import java.util.Date;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
class EJsonWriter {
/**
* Base jsonFactory implementation used when it is not passed in.
*/
static final JsonFactory jsonFactory = new JsonFactory();
static String write(Object object) throws IOException {
StringWriter writer = new StringWriter(200);
write(object, writer).close();
return writer.toString();
}
static JsonGenerator write(Object object, Writer writer) throws IOException {
JsonGenerator generator = jsonFactory.createGenerator(writer);
write(object, generator);
generator.flush();
return generator;
}
static void write(Object object, JsonGenerator jsonGenerator) {
new EJsonWriter(jsonGenerator).writeJson(object);
}
static void writeCollection(Collection collection, JsonGenerator jsonGenerator) throws IOException {
new EJsonWriter(jsonGenerator).writeCollection(null, collection);
}
private final JsonGenerator jsonGenerator;
private EJsonWriter(JsonGenerator jsonGenerator) {
this.jsonGenerator = jsonGenerator;
}
private void writeJson(Object object) {
writeJson(null, object);
}
@SuppressWarnings("unchecked")
private void writeJson(String name, Object object) {
try {
if (object == null) {
writeNull(name);
} else if (object instanceof Number) {
writeNumber(name, (Number) object);
} else if (object instanceof String) {
writeString(name, (String) object);
} else if (object instanceof Map) {
writeMap(name, (Map) object);
} else if (object instanceof Collection) {
writeCollection(name, (Collection) object);
} else if (object instanceof Boolean) {
writeBoolean(name, (Boolean) object);
} else if (object instanceof Date) {
writeDate(name, (Date) object);
} else if (object instanceof Map.Entry) {
Map.Entry entry = (Map.Entry) object;
writeJson(entry.getKey().toString(), entry.getValue());
} else {
writeString(name, object.toString());
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void writeBoolean(String name, Boolean object) throws IOException {
if (name == null) {
jsonGenerator.writeBoolean(object);
} else {
jsonGenerator.writeBooleanField(name, object);
}
}
private void writeDate(String name, Date object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber(object.getTime());
} else {
jsonGenerator.writeNumberField(name, object.getTime());
}
}
private void writeNumber(String name, Number object) throws IOException {
if (object instanceof Long) {
writeLong(name, object);
} else if (object instanceof Integer) {
writeInteger(name, object);
} else if (object instanceof Double) {
writeDouble(name, object);
} else if (object instanceof BigDecimal) {
writeBigDecimal(name, object);
} else if (object instanceof BigInteger) {
writeBigInteger(name, object);
} else {
writeGeneralNumber(name, object);
}
}
private void writeGeneralNumber(String name, Number object) throws IOException {
writeBigDecimal(name, new BigDecimal(object.toString()));
}
private void writeBigDecimal(String name, Number object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber((BigDecimal) object);
} else {
jsonGenerator.writeNumberField(name, (BigDecimal) object);
}
}
private void writeBigInteger(String name, Number object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber((BigInteger) object);
} else {
jsonGenerator.writeNumberField(name, object.longValue());
}
}
private void writeDouble(String name, Number object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber((Double) object);
} else {
jsonGenerator.writeNumberField(name, (Double) object);
}
}
private void writeLong(String name, Number object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber((Long) object);
} else {
jsonGenerator.writeNumberField(name, (Long) object);
}
}
private void writeInteger(String name, Number object) throws IOException {
if (name == null) {
jsonGenerator.writeNumber((Integer) object);
} else {
jsonGenerator.writeNumberField(name, (Integer) object);
}
}
private void writeNull(String name) throws IOException {
if (name == null) {
jsonGenerator.writeNull();
} else {
jsonGenerator.writeNullField(name);
}
}
private void writeString(String name, String object) throws IOException {
if (name == null) {
jsonGenerator.writeString(object);
} else {
jsonGenerator.writeStringField(name, object);
}
}
private void writeCollection(String name, Collection collection) throws IOException {
if (name != null) {
jsonGenerator.writeFieldName(name);
}
jsonGenerator.writeStartArray();
for (Object object : collection) {
writeJson(null, object);
}
jsonGenerator.writeEndArray();
}
private void writeMap(String name, Map map) throws IOException {
if (name != null) {
jsonGenerator.writeFieldName(name);
}
jsonGenerator.writeStartObject();
Set> entrySet = map.entrySet();
for (Entry entry : entrySet) {
writeJson(entry.getKey().toString(), entry.getValue());
}
jsonGenerator.writeEndObject();
}
}
