StringOrArrayDeserializer.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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 org.keycloak.json;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

public class StringOrArrayDeserializer extends JsonDeserializer<Object> {

    @Override
    public Object deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        JsonNode jsonNode = jsonParser.readValueAsTree();
        if (jsonNode.isArray()) {
            ArrayList<String> a = new ArrayList<>(1);
            Iterator<JsonNode> itr = jsonNode.iterator();
            while (itr.hasNext()) {
                a.add(itr.next().textValue());
            }
            return a.toArray(new String[a.size()]);
        } else {
            return new String[] { jsonNode.textValue() };
        }
    }

}