/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.internal.offheap;

import java.io.DataOutput;
import java.io.IOException;

import org.apache.geode.DataSerializer;
import org.apache.geode.cache.Region;
import org.apache.geode.internal.DSCODE;
import org.apache.geode.internal.DataSerializableFixedID;
import org.apache.geode.internal.InternalDataSerializer;
import org.apache.geode.internal.cache.RegionEntry;
import org.apache.geode.internal.lang.StringUtils;

public abstract class AbstractStoredObject implements StoredObject {
  @Override
  public Object getValueAsDeserializedHeapObject() {
    return getDeserializedValue(null, null);
  }

  @Override
  public byte[] getValueAsHeapByteArray() {
    if (isSerialized()) {
      return getSerializedValue();
    } else {
      return (byte[]) getDeserializedForReading();
    }
  }

  @Override
  public String getStringForm() {
    try {
      return StringUtils.forceToString(getDeserializedForReading());
    } catch (RuntimeException ex) {
      return "Could not convert object to string because " + ex;
    }
  }

  @Override
  public Object getDeserializedForReading() {
    return getDeserializedValue(null, null);
  }

  @Override
  public Object getDeserializedWritableCopy(Region r, RegionEntry re) {
    return getDeserializedValue(null, null);
  }

  @Override
  public Object getValue() {
    if (isSerialized()) {
      return getSerializedValue();
    } else {
      throw new IllegalStateException(
          "Can not call getValue on StoredObject that is not serialized");
    }
  }

  @Override
  public void writeValueAsByteArray(DataOutput out) throws IOException {
    DataSerializer.writeByteArray(getSerializedValue(), out);
  }

  @Override
  public void sendTo(DataOutput out) throws IOException {
    if (isSerialized()) {
      out.write(getSerializedValue());
    } else {
      Object objToSend = (byte[]) getDeserializedForReading(); // deserialized as a byte[]
      DataSerializer.writeObject(objToSend, out);
    }
  }

  @Override
  public void sendAsByteArray(DataOutput out) throws IOException {
    byte[] bytes;
    if (isSerialized()) {
      bytes = getSerializedValue();
    } else {
      bytes = (byte[]) getDeserializedForReading();
    }
    DataSerializer.writeByteArray(bytes, out);

  }

  @Override
  public void sendAsCachedDeserializable(DataOutput out) throws IOException {
    if (!isSerialized()) {
      throw new IllegalStateException(
          "sendAsCachedDeserializable can only be called on serialized StoredObjects");
    }
    InternalDataSerializer.writeDSFIDHeader(DataSerializableFixedID.VM_CACHED_DESERIALIZABLE, out);
    sendAsByteArray(out);
  }

  @Override
  public boolean usesHeapForStorage() {
    return false;
  }

  @Override
  public boolean isSerializedPdxInstance() {
    if (!isSerialized()) {
      return false;
    }
    byte dsCode = this.readDataByte(0);
    return dsCode == DSCODE.PDX || dsCode == DSCODE.PDX_ENUM || dsCode == DSCODE.PDX_INLINE_ENUM;
  }

  @Override
  public StoredObject getStoredObjectWithoutHeapForm() {
    // the only implementation that needs to override this
    // is OffHeapStoredObjectWithHeapForm.
    return this;
  }

}