| /** |
| * 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.ant.condition; |
| |
| import org.apache.tools.ant.taskdefs.condition.Condition; |
| |
| /** |
| * This wrapper around {@link org.apache.hadoop.ant.DfsTask} implements the |
| * Ant >1.5 |
| * {@link org.apache.tools.ant.taskdefs.condition.Condition Condition} |
| * interface for HDFS tests. So one can test conditions like this: |
| * {@code |
| * <condition property="precond"> |
| * <and> |
| * <hadoop:exists file="fileA" /> |
| * <hadoop:exists file="fileB" /> |
| * <hadoop:sizezero file="fileB" /> |
| * </and> |
| * </condition> |
| * } |
| * This will define the property precond if fileA exists and fileB has zero |
| * length. |
| */ |
| public abstract class DfsBaseConditional extends org.apache.hadoop.ant.DfsTask |
| implements Condition { |
| |
| protected boolean result; |
| String file; |
| |
| private void initArgs() { |
| setCmd("test"); |
| setArgs("-" + getFlag() + "," + file); |
| } |
| |
| public void setFile(String file) { |
| this.file = file; |
| } |
| |
| protected abstract char getFlag(); |
| |
| protected int postCmd(int exit_code) { |
| exit_code = super.postCmd(exit_code); |
| result = exit_code == 0; |
| return exit_code; |
| } |
| |
| public boolean eval() { |
| initArgs(); |
| execute(); |
| return result; |
| } |
| } |