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Common Expression Language Runtime for Java

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// Copyright 2022 Google LLC
//
// 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
//
//      https://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 dev.cel.common.internal;

import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import static java.nio.charset.StandardCharsets.ISO_8859_1;

import com.google.common.annotations.VisibleForTesting;
import com.google.errorprone.annotations.Immutable;
import dev.cel.common.annotations.Internal;

/**
 * Represents an in-memory contiguous source of ISO-LATIN-1 code points.
 *
 * CEL Library Internals. Do Not Use.
 */
@Immutable
@VisibleForTesting
@Internal
public final class Latin1CodePointArray extends CelCodePointArray {

  @SuppressWarnings("Immutable")
  private final byte[] codePoints;

  private final int offset;
  private final int size;

  Latin1CodePointArray(byte[] codePoints, int size) {
    this(codePoints, 0, size);
  }

  Latin1CodePointArray(byte[] codePoints, int offset, int size) {
    this.codePoints = checkNotNull(codePoints);
    this.offset = offset;
    this.size = size;
  }

  @Override
  public Latin1CodePointArray slice(int i, int j) {
    checkPositionIndexes(i, j, size());
    return new Latin1CodePointArray(codePoints, offset + i, j - i);
  }

  @Override
  public int get(int index) {
    checkElementIndex(index, size());
    return Byte.toUnsignedInt(codePoints[offset + index]);
  }

  @Override
  public int size() {
    return size;
  }

  @Override
  public String toString() {
    return new String(codePoints, offset, size, ISO_8859_1);
  }
}