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/*
 * Copyright (C) 2019 Square, Inc.
 *
 * 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.squareup.moshi.internal;

import com.jn.langx.annotation.Nullable;
import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.JsonDataException;
import com.squareup.moshi.JsonReader;
import com.squareup.moshi.JsonWriter;
import java.io.IOException;

public final class NonNullJsonAdapter extends JsonAdapter {

  private final JsonAdapter delegate;

  public NonNullJsonAdapter(JsonAdapter delegate) {
    this.delegate = delegate;
  }

  public JsonAdapter delegate() {
    return delegate;
  }

  @Override
  public T fromJson(JsonReader reader) throws IOException {
    if (reader.peek() == JsonReader.Token.NULL) {
      throw new JsonDataException("Unexpected null at " + reader.getPath());
    } else {
      return delegate.fromJson(reader);
    }
  }

  @Override
  public void toJson(JsonWriter writer, @Nullable T value) throws IOException {
    if (value == null) {
      throw new JsonDataException("Unexpected null at " + writer.getPath());
    } else {
      delegate.toJson(writer, value);
    }
  }

  @Override
  public String toString() {
    return delegate + ".nonNull()";
  }
}