001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.commons.io.res.util; 020 021 022import java.util.Map; 023 024import lucee.commons.collection.LinkedHashMapMaxSize; 025import lucee.commons.io.res.Resource; 026import lucee.runtime.PageSource; 027 028public class ResourceSnippetsMap { 029 030 /* methods that access these Map objects should take care of synchronization */ 031 private final Map<String, String> sources; 032 private final Map<String, ResourceSnippet> snippets; 033 034 public ResourceSnippetsMap( int maxSnippets, int maxSources ) { 035 036 sources = new LinkedHashMapMaxSize<String, String>( maxSources ); 037 snippets = new LinkedHashMapMaxSize<String, ResourceSnippet>( maxSnippets ); 038 } 039 040 /** 041 * this method accesses the underlying Map(s) and is therefore synchronized 042 * 043 * @param ps 044 * @param startPos 045 * @param endPos 046 * @param charset 047 * @return 048 */ 049 public synchronized ResourceSnippet getSnippet( PageSource ps, int startPos, int endPos, String charset ) { 050 051 String keySnp = calcKey( ps, startPos, endPos ); 052 053 ResourceSnippet snippet = snippets.get( keySnp ); 054 055 if ( snippet == null ) { 056 057 Resource res = ps.getResource(); 058 String keyRes = calcKey( res ); 059 String src = sources.get( keyRes ); 060 061 if ( src == null ) { 062 src = ResourceSnippet.getContents( res, charset ); 063 sources.put( keyRes, src ); 064 } 065 066 snippet = ResourceSnippet.createResourceSnippet( src, startPos, endPos ); 067 snippets.put( keySnp, snippet ); 068 } 069 070 return snippet; 071 } 072 073 public static String calcKey( Resource res ) { 074 075 return res.getAbsolutePath() + "@" + res.lastModified(); 076 } 077 078 public static String calcKey( PageSource ps, int startPos, int endPos ) { 079 080 return ps.getDisplayPath() + "@" + ps.getLastAccessTime() + ":" + startPos + "-" + endPos; 081 } 082}