| /* |
| * 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.karaf.util; |
| |
| import java.io.Closeable; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.InputStream; |
| import java.io.PrintStream; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Scanner; |
| |
| public class TemplateUtils { |
| private TemplateUtils() { |
| } |
| |
| public static void createFromTemplate(File outFile, InputStream templateIs, HashMap<String, String> properties) { |
| if (outFile.exists()) { |
| throw new IllegalArgumentException("File " + outFile.getPath() |
| + " already exists. Remove it if you wish to recreate it."); |
| } |
| PrintStream out = null; |
| Scanner scanner = null; |
| try { |
| // read it line at a time so that we can use the platform line ending when we write it out |
| out = new PrintStream(new FileOutputStream(outFile)); |
| scanner = new Scanner(templateIs); |
| |
| while (scanner.hasNextLine()) { |
| String line = scanner.nextLine(); |
| line = filter(line, properties); |
| out.println(line); |
| } |
| } catch (FileNotFoundException e) { |
| throw new RuntimeException("Can not create " + outFile, e); |
| } finally { |
| safeClose(out); |
| safeClose(templateIs); |
| } |
| } |
| |
| private static String filter(String line, HashMap<String, String> props) { |
| for (Map.Entry<String, String> entry : props.entrySet()) { |
| String key = "${" + entry.getKey() + "}"; |
| int p1 = line.indexOf(key); |
| if (p1 >= 0) { |
| String l1 = line.substring(0, p1); |
| String l2 = line.substring(p1 + key.length()); |
| line = l1 + entry.getValue() + l2; |
| } |
| } |
| return line; |
| } |
| |
| private static void safeClose(Closeable cl) { |
| if (cl == null) { |
| return; |
| } |
| try { |
| cl.close(); |
| } catch (Throwable ignore) { |
| // nothing to do |
| } |
| } |
| |
| } |