/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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.android.ahat.heapdump;

public class FieldValue implements Diffable<FieldValue> {
  private final String mName;
  private final String mType;
  private final Value mValue;
  private FieldValue mBaseline;
  private final boolean mIsPlaceHolder;

  public FieldValue(String name, String type, Value value) {
    mName = name;
    mType = type;
    mValue = value;
    mBaseline = this;
    mIsPlaceHolder = false;
  }

  /**
   * Construct a place holder FieldValue
   */
  private FieldValue(FieldValue baseline) {
    mName = baseline.mName;
    mType = baseline.mType;
    mValue = Value.getBaseline(baseline.mValue);
    mBaseline = baseline;
    mIsPlaceHolder = true;
  }

  static FieldValue newPlaceHolderFieldValue(FieldValue baseline) {
    FieldValue field = new FieldValue(baseline);
    baseline.setBaseline(field);
    return field;
  }

  /**
   * Returns the name of the field.
   */
  public String getName() {
    return mName;
  }

  /**
   * Returns a description of the type of the field.
   */
  public String getType() {
    return mType;
  }

  /**
   * Returns the value of this field.
   */
  public Value getValue() {
    return mValue;
  }

  public void setBaseline(FieldValue baseline) {
    mBaseline = baseline;
  }

  @Override public FieldValue getBaseline() {
    return mBaseline;
  }

  @Override public boolean isPlaceHolder() {
    return mIsPlaceHolder;
  }
}
