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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.slime;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Optional;
/**
* Extra utilities/operations on slime trees.
*
* @author Ulf Lilleengen
*/
public class SlimeUtils {
public static void copyObject(Inspector from, Cursor to) {
if (from.type() != Type.OBJECT) {
throw new IllegalArgumentException("Cannot copy object: " + from);
}
from.traverse((ObjectTraverser) (name, inspector) -> setObjectEntry(inspector, name, to));
}
private static void setObjectEntry(Inspector from, String name, Cursor to) {
switch (from.type()) {
case NIX:
to.setNix(name);
break;
case BOOL:
to.setBool(name, from.asBool());
break;
case LONG:
to.setLong(name, from.asLong());
break;
case DOUBLE:
to.setDouble(name, from.asDouble());
break;
case STRING:
to.setString(name, from.asString());
break;
case DATA:
to.setData(name, from.asData());
break;
case ARRAY:
Cursor array = to.setArray(name);
copyArray(from, array);
break;
case OBJECT:
Cursor object = to.setObject(name);
copyObject(from, object);
break;
}
}
private static void copyArray(Inspector from, final Cursor to) {
from.traverse((ArrayTraverser) (i, inspector) -> addValue(inspector, to));
}
private static void addValue(Inspector from, Cursor to) {
switch (from.type()) {
case NIX:
to.addNix();
break;
case BOOL:
to.addBool(from.asBool());
break;
case LONG:
to.addLong(from.asLong());
break;
case DOUBLE:
to.addDouble(from.asDouble());
break;
case STRING:
to.addString(from.asString());
break;
case DATA:
to.addData(from.asData());
break;
case ARRAY:
Cursor array = to.addArray();
copyArray(from, array);
break;
case OBJECT:
Cursor object = to.addObject();
copyObject(from, object);
break;
}
}
public static byte[] toJsonBytes(Slime slime) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
new JsonFormat(true).encode(baos, slime);
return baos.toByteArray();
}
public static Slime jsonToSlime(byte[] json) {
Slime slime = new Slime();
new JsonDecoder().decode(slime, json);
return slime;
}
public static Slime jsonToSlime(String json) {
return jsonToSlime(json.getBytes(StandardCharsets.UTF_8));
}
/** Throws {@link JsonParseException} on invalid JSON. */
public static Slime jsonToSlimeOrThrow(String json) {
return jsonToSlimeOrThrow(json.getBytes(StandardCharsets.UTF_8));
}
public static Slime jsonToSlimeOrThrow(byte[] json) {
Slime slime = new Slime();
new JsonDecoder().decodeOrThrow(slime, json);
return slime;
}
public static Optional<String> optionalString(Inspector inspector) {
return Optional.of(inspector.asString()).filter(s -> !s.isEmpty());
}
}
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