org.apache.hadoop.hive.common.io.FetchConverter Maven / Gradle / Ivy
/**
* 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.hadoop.hive.common.io;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
public abstract class FetchConverter extends PrintStream {
protected volatile boolean queryfound;
protected volatile boolean fetchStarted;
public FetchConverter(OutputStream out, boolean autoFlush, String encoding)
throws UnsupportedEncodingException {
super(out, autoFlush, encoding);
}
public void foundQuery(boolean queryfound) {
this.queryfound = queryfound;
}
public void fetchStarted() {
fetchStarted = true;
}
public void println(String out) {
if (byPass()) {
printDirect(out);
} else {
process(out);
}
}
protected final void printDirect(String out) {
super.println(out);
}
protected final boolean byPass() {
return !queryfound || !fetchStarted;
}
protected abstract void process(String out);
protected abstract void processFinal();
@Override
public void flush() {
if (byPass()) {
super.flush();
}
}
public void fetchFinished() {
if (!byPass()) {
processFinal();
}
super.flush();
fetchStarted = false;
}
}
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