content: /*
   * 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
   *
   *     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 org.apache.avro.io;
  
  import java.io.IOException;
  import java.util.Arrays;
  
  import org.apache.avro.AvroTypeException;
  
  /**
   * Base class for <a href="parsing/package-summary.html">parser</a>-based
   * {@link Encoder}s.
   */
  public abstract class ParsingEncoder extends Encoder {
    /**
     * Tracks the number of items that remain to be written in the collections
     * (array or map).
     */
    private long[] counts = new long[10];
  
    protected int pos = -1;
  
    @Override
    public void setItemCount(long itemCount) throws IOException {
      if (counts[pos] != 0) {
        throw new AvroTypeException("Incorrect number of items written. " + counts[pos] + " more required.");
      }
      counts[pos] = itemCount;
    }
  
    @Override
    public void startItem() throws IOException {
      counts[pos]--;
    }
  
    /** Push a new collection on to the stack. */
    protected final void push() {
      if (++pos == counts.length) {
        counts = Arrays.copyOf(counts, pos + 10);
      }
      counts[pos] = 0;
    }
  
    protected final void pop() {
      if (counts[pos] != 0) {
        throw new AvroTypeException("Incorrect number of items written. " + counts[pos] + " more required.");
      }
      pos--;
    }
  
    protected final int depth() {
      return pos;
    }
  }
  