| /* |
| * 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.accumulo.core.client.lexicoder; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static java.util.Objects.requireNonNull; |
| |
| import org.apache.accumulo.core.iterators.ValueFormatException; |
| |
| /** |
| * AbstractEncoder is an {@link org.apache.accumulo.core.client.lexicoder.Encoder} that implements |
| * all of Encoder's methods validating the input, but has those methods defer logic to to a new |
| * method, {@link #decodeUnchecked(byte[], int, int)}. |
| * |
| * @since 1.7.0 |
| */ |
| public abstract class AbstractEncoder<T> implements Encoder<T> { |
| |
| /** |
| * Decodes a byte array without checking if the offset and len exceed the bounds of the actual |
| * array. |
| */ |
| protected abstract T decodeUnchecked(byte[] b, int offset, int len) throws ValueFormatException; |
| |
| @Override |
| public T decode(byte[] b) { |
| requireNonNull(b, "cannot decode null byte array"); |
| return decodeUnchecked(b, 0, b.length); |
| } |
| |
| /** |
| * Checks if the byte array is null, or if parameters exceed the bounds of the byte array, then |
| * calls {@link #decodeUnchecked(byte[], int, int)}. |
| * |
| * @throws java.lang.NullPointerException |
| * if {@code b} is null |
| * @throws java.lang.IllegalArgumentException |
| * if {@code offset + len} exceeds the length of {@code b} |
| */ |
| public T decode(byte[] b, int offset, int len) { |
| requireNonNull(b, "cannot decode null byte array"); |
| checkArgument(offset >= 0, "offset %s cannot be negative", offset); |
| checkArgument(len >= 0, "length %s cannot be negative", len); |
| checkArgument(offset + len <= b.length, "offset + length %s exceeds byte array length %s", |
| (offset + len), b.length); |
| |
| return decodeUnchecked(b, offset, len); |
| } |
| } |