/tags/release-0.0.0-rc0/hive/external/ant/src/org/apache/hadoop/hive/ant/GetVersionPref.java
Java | 94 lines | 41 code | 14 blank | 39 comment | 4 complexity | 9867398c0bd8921213e37848b25a0563 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.ant;
- import org.apache.tools.ant.AntClassLoader;
- import org.apache.tools.ant.BuildException;
- import org.apache.tools.ant.Task;
- import org.apache.tools.ant.Project;
- import java.util.regex.Pattern;
- import java.util.regex.Matcher;
- import java.io.*;
- /**
- * Implementation of the ant task <getversionpref property="nameoftheproperty" input="versionstring"/>.
- *
- * This ant task takes an input version string (e.g. 0.17.2) and set an ant property (whose name
- * is specified in the property attribute) with the version prefix. For 0.17.2, the version prefix
- * is 0.17. Similarly, for 0.18.0, the version prefix is 0.18. The version prefix is the first two
- * components of the version string.
- */
- public class GetVersionPref extends Task {
- /**
- * The name of the property that gets the version prefix.
- */
- protected String property;
- /**
- * The input string that contains the version string.
- */
- protected String input;
-
- public void setProperty(String property) {
- this.property = property;
- }
- public String getProperty() {
- return property;
- }
- public void setInput(String input) {
- this.input = input;
- }
- public String getInput() {
- return input;
- }
- /**
- * Executes the ant task <getversionperf>.
- *
- * It extracts the version prefix using regular expressions on the version string. It then sets
- * the property in the project with the extracted prefix. The property is set to an empty string
- * in case no match is found for the prefix regular expression (which will happen in case the
- * version string does not conform to the version format).
- */
- @Override
- public void execute() throws BuildException {
- if (property == null) {
- throw new BuildException("No property specified");
- }
- if (input == null) {
- throw new BuildException("No input stringspecified");
- }
- try {
- Pattern p = Pattern.compile("^(\\d+\\.\\d+).*");
- Matcher m = p.matcher(input);
- getProject().setProperty(property, m.matches() ? m.group(1) : "");
- }
- catch (Exception e) {
- throw new BuildException("Failed with: " + e.getMessage());
- }
- }
- }