/*
 * Copyright (C) 2008 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.dx.rop.cst;

import com.android.dx.rop.type.Type;

/** Utility for turning types into zeroes. */
public final class Zeroes {
  /** This class is uninstantiable. */
  private Zeroes() {
    // This space intentionally left blank.
  }

  /**
   * Gets the "zero" (or {@code null}) value for the given type.
   *
   * @param type {@code non-null;} the type in question
   * @return {@code non-null;} its "zero" value
   */
  public static Constant zeroFor(Type type) {
    switch (type.getBasicType()) {
      case Type.BT_BOOLEAN:
        return CstBoolean.VALUE_FALSE;
      case Type.BT_BYTE:
        return CstByte.VALUE_0;
      case Type.BT_CHAR:
        return CstChar.VALUE_0;
      case Type.BT_DOUBLE:
        return CstDouble.VALUE_0;
      case Type.BT_FLOAT:
        return CstFloat.VALUE_0;
      case Type.BT_INT:
        return CstInteger.VALUE_0;
      case Type.BT_LONG:
        return CstLong.VALUE_0;
      case Type.BT_SHORT:
        return CstShort.VALUE_0;
      case Type.BT_OBJECT:
        return CstKnownNull.THE_ONE;
      default:
        {
          throw new UnsupportedOperationException("no zero for type: " + type.toHuman());
        }
    }
  }
}
