/*
 * Copyright (C) 2007 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.jack.dx.rop.cst;

import com.android.jack.dx.dex.file.ValueEncoder.ValueType;
import com.android.jack.dx.rop.type.Type;
import com.android.jack.dx.util.Hex;

import javax.annotation.Nonnull;

/**
 * Constants of type {@code short}.
 */
public final class CstShort extends CstLiteral32 {
  /** {@code non-null;} the value {@code 0} as an instance of this class */
  public static final CstShort VALUE_0 = make((short) 0);

  /**
   * Makes an instance for the given value. This may (but does not
   * necessarily) return an already-allocated instance.
   *
   * @param value the {@code short} value
   * @return {@code non-null;} the appropriate instance
   */
  public static CstShort make(short value) {
    return new CstShort(value);
  }

  /**
   * Makes an instance for the given {@code int} value. This
   * may (but does not necessarily) return an already-allocated
   * instance.
   *
   * @param value the value, which must be in range for a {@code short}
   * @return {@code non-null;} the appropriate instance
   */
  public static CstShort make(int value) {
    short cast = (short) value;

    if (cast != value) {
      throw new IllegalArgumentException("bogus short value: " + value);
    }

    return make(cast);
  }

  /**
   * Constructs an instance. This constructor is private; use {@link #make}.
   *
   * @param value the {@code short} value
   */
  private CstShort(short value) {
    super(value);
  }

  /** {@inheritDoc} */
  @Override
  public String toString() {
    int value = getIntBits();
    return "short{0x" + Hex.u2(value) + " / " + value + '}';
  }

  /** {@inheritDoc} */
  @Override
  public Type getType() {
    return Type.SHORT;
  }

  /** {@inheritDoc} */
  @Override
  public String typeName() {
    return "short";
  }

  /** {@inheritDoc} */
  @Override
  public String toHuman() {
    return Integer.toString(getIntBits());
  }

  /**
   * Gets the {@code short} value.
   *
   * @return the value
   */
  public short getValue() {
    return (short) getIntBits();
  }

  @Override
  @Nonnull
  public ValueType getEncodedValueType() {
    return ValueType.VALUE_SHORT;
  }
}