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/*
* Copyright (C) 2014-2024 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.helger.json.convert;
import java.util.Collection;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import com.helger.commons.annotation.PresentForCodeCoverage;
import com.helger.commons.collection.ArrayHelper;
import com.helger.commons.typeconvert.TypeConverter;
import com.helger.json.IHasJson;
import com.helger.json.IJson;
import com.helger.json.IJsonArray;
import com.helger.json.IJsonObject;
import com.helger.json.JsonArray;
import com.helger.json.JsonObject;
import com.helger.json.JsonValue;
/**
* A utility class for converting objects from and to {@link IJson}.
*
* @author Philip Helger
*/
@Immutable
public final class JsonConverter
{
@PresentForCodeCoverage
private static final JsonConverter INSTANCE = new JsonConverter ();
private JsonConverter ()
{}
/**
* Convert any Object to an {@link IJson} representation. Supported classes
* are:
*
* null
* - com.helger.json.IJson
* - com.helger.json.IJsonProvider
* - boolean []
* - byte []
* - char []
* - double []
* - float []
* - int []
* - long []
* - short []
* - Object [] - recursive invocation
* - Collection<?> - recursive invocation
* - Map<?,?> - recursive invocation, key must be a String!
*
* All other objects are put "as is" into {@link JsonValue} objects.
*
* @param aObject
* Source Object to convert May be null
.
* @return Never null
.
*/
@Nonnull
public static IJson convertToJson (@Nullable final Object aObject)
{
if (aObject == null)
return JsonValue.NULL;
if (aObject instanceof IJson)
return (IJson) aObject;
if (aObject instanceof IHasJson)
return ((IHasJson) aObject).getAsJson ();
if (ArrayHelper.isArray (aObject))
{
if (aObject instanceof boolean [])
{
final boolean [] aArray = (boolean []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof byte [])
{
final byte [] aArray = (byte []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof char [])
{
final char [] aArray = (char []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof double [])
{
final double [] aArray = (double []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof float [])
{
final float [] aArray = (float []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof int [])
{
final int [] aArray = (int []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof long [])
{
final long [] aArray = (long []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof short [])
{
final short [] aArray = (short []) aObject;
return new JsonArray (aArray.length).addAll (aArray);
}
if (aObject instanceof Object [])
{
final Object [] aArray = (Object []) aObject;
final IJsonArray aJsonArray = new JsonArray (aArray.length);
for (final Object aValue : aArray)
{
// Recursive conversion
aJsonArray.add (convertToJson (aValue));
}
return aJsonArray;
}
throw new IllegalStateException ("Expected an array but got none. Object=" + aObject);
}
if (aObject instanceof Collection >)
{
final Collection > aCollection = (Collection >) aObject;
final IJsonArray aJsonArray = new JsonArray (aCollection.size ());
for (final Object aValue : aCollection)
{
// Recursive conversion
aJsonArray.add (convertToJson (aValue));
}
return aJsonArray;
}
if (aObject instanceof Map , ?>)
{
final Map , ?> aMap = (Map , ?>) aObject;
final IJsonObject aJsonObject = new JsonObject (aMap.size ());
for (final Map.Entry , ?> aEntry : aMap.entrySet ())
{
final String sKey = TypeConverter.convert (aEntry.getKey (), String.class);
if (sKey == null)
throw new IllegalArgumentException ("Map key '" + aEntry.getKey () + "' could not be converted to a String!");
// Recursive conversion
final IJson aValue = convertToJson (aEntry.getValue ());
aJsonObject.addJson (sKey, aValue);
}
return aJsonObject;
}
// Assume it is a simple value
return JsonValue.create (aObject);
}
}
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