exec/java-exec/src/main/java/org/apache/drill/exec/expr/SingleClassStringWriter.java

/*
 * 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.drill.exec.expr;

import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.io.Writer;

import com.google.common.base.Preconditions;
import com.sun.codemodel.CodeWriter;
import com.sun.codemodel.JPackage;

public class SingleClassStringWriter extends CodeWriter{
  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SingleClassStringWriter.class);

  private boolean used;
  private StringWriter writer = new StringWriter();

  @Override
  public OutputStream openBinary(JPackage pkg, String fileName) throws IOException {
    throw new UnsupportedOperationException();
  }


  @Override
  public Writer openSource(JPackage pkg, String fileName) throws IOException {
    Preconditions.checkArgument(!used, "The SingleClassStringWriter can only output once src file.");
    used = true;
    return writer;
  }

  @Override
  public void close() throws IOException {
  }

  public StringBuffer getCode(){
    return writer.getBuffer();
  }


}