| /* |
| * Copyright (C) 2010 Google Inc. |
| * |
| * Licensed 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 com.google.clearsilver.jsilver.precompiler; |
| |
| import com.google.clearsilver.jsilver.autoescape.EscapeMode; |
| import com.google.clearsilver.jsilver.exceptions.JSilverAutoEscapingException; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.ImmutableMap; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.LineNumberReader; |
| import java.io.Reader; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| |
| /** |
| * Utility class that reads in the file output by BatchCompiler that is a list of template names and |
| * corresponding class names and returns a Map of template filenames to class names which can be fed |
| * to {@see com.google.clearsilver.jsilver.JSilverOptions#setPrecompiledTemplateMap} |
| */ |
| public class PrecompiledTemplateMapFileReader { |
| |
| private final String mapFileName; |
| private final String dirPattern; |
| private final String rootDir; |
| |
| private Map<Object, String> templateMap = null; |
| |
| /** |
| * Helper object that reads in the specified resource file and generates a mapping of template |
| * filenames to corresponding BaseCompiledTemplate class names. |
| * |
| * @param filename name of the resource file to read the map from. |
| * @param dirPattern prefix to remove from read in template names. Used in conjunction with |
| * rootDir to update template file paths. |
| * @param rootDir optional string to prepend to all non-absolute template filenames. Should be set |
| * to the location of the templates in production via a flag. |
| */ |
| public PrecompiledTemplateMapFileReader(String filename, String dirPattern, String rootDir) { |
| this.mapFileName = filename; |
| this.dirPattern = dirPattern; |
| this.rootDir = rootDir; |
| } |
| |
| public Map<Object, String> getTemplateMap() throws IOException { |
| if (templateMap == null) { |
| templateMap = makeTemplateMap(mapFileName, rootDir); |
| } |
| return templateMap; |
| } |
| |
| private Map<Object, String> makeTemplateMap(String templateMapFile, String rootDir) |
| throws IOException { |
| Map<Object, String> templateMap = new HashMap<Object, String>(); |
| LineNumberReader reader = null; |
| try { |
| reader = new LineNumberReader(getMapFileReader(templateMapFile)); |
| for (String line = reader.readLine(); line != null; line = reader.readLine()) { |
| // Process single line from the templateMapFile |
| // and put found templates into templateMap. |
| processTemplateMapFileLine(line, reader.getLineNumber(), templateMap, templateMapFile, |
| rootDir); |
| } |
| } finally { |
| if (reader != null) { |
| reader.close(); |
| } |
| } |
| return ImmutableMap.copyOf(templateMap); |
| } |
| |
| private void processTemplateMapFileLine(String line, int lineNumber, |
| Map<Object, String> templateMap, String templateMapFile, String rootDir) { |
| |
| line = line.trim(); |
| if (line.isEmpty() || line.startsWith("#")) { |
| // Ignore blank lines and comment lines. |
| return; |
| } |
| StringTokenizer st = new StringTokenizer(line); |
| if (!st.hasMoreTokens()) { |
| throw new IllegalArgumentException("No template file name found in " + templateMapFile |
| + " on line " + lineNumber + ": " + line); |
| } |
| String templateName = st.nextToken(); |
| if (dirPattern != null && templateName.startsWith(dirPattern)) { |
| templateName = templateName.substring(dirPattern.length()); |
| } |
| if (rootDir != null) { |
| // If it is not an absolute path and we were given a root directory, |
| // prepend it. |
| templateName = rootDir + templateName; |
| } |
| if (!st.hasMoreTokens()) { |
| throw new IllegalArgumentException("No class name found in " + templateMapFile + " on line " |
| + lineNumber + ": " + line); |
| } |
| String className = st.nextToken(); |
| EscapeMode escapeMode; |
| if (!st.hasMoreTokens()) { |
| escapeMode = EscapeMode.ESCAPE_NONE; |
| } else { |
| String escapeCmd = st.nextToken(); |
| try { |
| escapeMode = EscapeMode.computeEscapeMode(escapeCmd); |
| } catch (JSilverAutoEscapingException e) { |
| throw new IllegalArgumentException("Invalid escape mode found in " + templateMapFile |
| + " on line " + lineNumber + ": " + escapeCmd); |
| } |
| } |
| PrecompiledTemplateMapKey key = new PrecompiledTemplateMapKey(templateName, escapeMode); |
| templateMap.put(key, className); |
| } |
| |
| @VisibleForTesting |
| protected Reader getMapFileReader(String templateMapFile) throws IOException { |
| ClassLoader classLoader = getClass().getClassLoader(); |
| InputStream in = classLoader.getResourceAsStream(templateMapFile); |
| if (in == null) { |
| throw new FileNotFoundException("Unable to locate resource: " + templateMapFile); |
| } |
| return new InputStreamReader(in, "UTF-8"); |
| } |
| |
| } |