content: /*
   * Copyright 2021 Alibaba Group Holding Limited.
   *
   * 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.alibaba.graphscope.stdcxx;
  
  import com.alibaba.fastffi.CXXHead;
  import com.alibaba.fastffi.FFIGen;
  import com.alibaba.fastffi.FFIPointer;
  import com.alibaba.fastffi.FFITypeAlias;
  
  import java.io.OutputStream;
  
  @FFIGen
  @CXXHead(
          value = {},
          system = {"ostream"})
  @FFITypeAlias("std::ostream")
  public interface OStream extends FFIPointer {
      /**
       * For `put(byte c)` we will generate a native method:
       *
       * <pre>{@code
       * public class OStreamImpl{
       *     public void put(byte c) { nativePut(getAddress(), c); }
       *     native void nativePut(long address, byte c);
       * }
       * }</pre>
       *
       * In the generated JNI cxx file:
       *
       * <pre>{@code
       * void Java_xxx_nativePut(JNIEnv*, jclass, jlong address, jbytec)
       * {
       *      std::ostream* obj = reinterpret_cast<std::ostream*>(address);
       *      obj->put(c);
       * }
       * }</pre>
       *
       * @param c byte
       */
      void put(byte c);
  
      default OutputStream outputStream() {
          return new OutputStream() {
              @Override
              public void write(int i) {
                  OStream.this.put((byte) i);
              }
  
              public void write(byte[] buf, int begin, int length) {
                  int end = begin + length;
                  for (int i = begin; i < end; i++) {
                      OStream.this.put(buf[i]);
                  }
              }
          };
      }
  }
  