| 1 | /* |
| 2 | @license.text@ |
| 3 | */ |
| 4 | package com.hammurapi.common; |
| 5 | |
| 6 | import java.io.IOException; |
| 7 | import java.io.InputStream; |
| 8 | import java.net.URL; |
| 9 | import java.util.Locale; |
| 10 | import java.util.Map; |
| 11 | import java.util.Properties; |
| 12 | |
| 13 | |
| 14 | /** |
| 15 | * Utility class which searches class hierarchy for a resource. |
| 16 | * Resource shall be named after class name, profile name is separated from |
| 17 | * class name by ! and locale separated from class name/profile by _. |
| 18 | * @author Pavel Vlasov |
| 19 | * @revision $Revision$ |
| 20 | */ |
| 21 | public class ClassResourceLoader { |
| 22 | private Visitable<Class<?>> visitable; |
| 23 | private String prefix; |
| 24 | private ClassLoader classLoader; |
| 25 | |
| 26 | public ClassResourceLoader(Class<?> clazz, String prefix, ClassLoader classLoader) { |
| 27 | this.visitable=new ClassHierarchyVisitable(clazz); |
| 28 | this.classLoader = classLoader==null ? clazz.getClassLoader() : classLoader; |
| 29 | this.prefix = prefix; |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * |
| 34 | * @param profile Profile, can be null |
| 35 | * @param extension Extension, can be null |
| 36 | * @return |
| 37 | */ |
| 38 | public URL getResource(String profile, String extension) { |
| 39 | return getResource(profile, Locale.getDefault(), extension); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * @param profile |
| 44 | * @param extension |
| 45 | * @return |
| 46 | */ |
| 47 | public URL getResource(final String profile, final Locale locale, final String extension) { |
| 48 | final URL[] ret={null}; |
| 49 | visitable.accept(new Visitor<Class<?>>() { |
| 50 | Locale actualLocale = locale==null ? Locale.getDefault() : locale; |
| 51 | |
| 52 | public boolean visit(Class<?> currentClass) { |
| 53 | for (int i=0; i<4; i++) { |
| 54 | String variant=currentClass.getName().replace('.','/'); |
| 55 | if (prefix!=null) { |
| 56 | variant = prefix + variant; |
| 57 | } |
| 58 | if (profile!=null) { |
| 59 | variant+="!"+profile; |
| 60 | } |
| 61 | |
| 62 | switch (i) { |
| 63 | case 0: |
| 64 | variant+="_"+actualLocale; |
| 65 | break; |
| 66 | case 1: |
| 67 | variant+="_"+actualLocale.getLanguage(); |
| 68 | if (actualLocale.getCountry().length()!=0) { |
| 69 | variant+="_"+actualLocale.getCountry(); |
| 70 | } |
| 71 | break; |
| 72 | case 2: |
| 73 | variant+="_"+actualLocale.getLanguage(); |
| 74 | break; |
| 75 | case 3: |
| 76 | break; |
| 77 | } |
| 78 | |
| 79 | if (extension!=null) { |
| 80 | variant+="."+extension; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | ret[0]=classLoader.getResource(variant); |
| 85 | if (ret[0]!=null) { |
| 86 | return false; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | return true; |
| 91 | } |
| 92 | |
| 93 | }); |
| 94 | |
| 95 | return ret[0]; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Collects properties from class hierarchy. |
| 100 | * @param profile Profile, can be null |
| 101 | * @param extension Extension, can be null |
| 102 | * @return |
| 103 | */ |
| 104 | public Properties getProperties(String profile, String extension) { |
| 105 | return getProperties(profile, Locale.getDefault(), extension); |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Collects properties from class hierarchy. |
| 110 | * @param profile |
| 111 | * @param extension |
| 112 | * @return |
| 113 | */ |
| 114 | public Properties getProperties(final String profile, final Locale locale, final String extension) { |
| 115 | final Properties ret=new Properties(); |
| 116 | visitable.accept(new Visitor<Class<?>>() { |
| 117 | |
| 118 | public boolean visit(Class<?> currentClass) { |
| 119 | for (int i=0; i<4; i++) { |
| 120 | String variant=currentClass.getName().replace('.','/'); |
| 121 | if (prefix!=null) { |
| 122 | variant = prefix + variant; |
| 123 | } |
| 124 | if (profile!=null) { |
| 125 | variant+=profile; |
| 126 | } |
| 127 | |
| 128 | switch (i) { |
| 129 | case 0: |
| 130 | variant+="_"+locale; |
| 131 | break; |
| 132 | case 1: |
| 133 | variant+="_"+locale.getLanguage(); |
| 134 | if (locale.getCountry().length()!=0) { |
| 135 | variant+="_"+locale.getCountry(); |
| 136 | } |
| 137 | break; |
| 138 | case 2: |
| 139 | variant+="_"+locale.getLanguage(); |
| 140 | break; |
| 141 | case 3: |
| 142 | break; |
| 143 | } |
| 144 | |
| 145 | if (extension!=null) { |
| 146 | variant+="."+extension; |
| 147 | } |
| 148 | |
| 149 | |
| 150 | InputStream s=classLoader.getResourceAsStream(variant); |
| 151 | if (s!=null) { |
| 152 | Properties cp=new Properties(); |
| 153 | try { |
| 154 | cp.load(s); |
| 155 | for (Map.Entry<Object, Object> entry: cp.entrySet()) { |
| 156 | if (!ret.containsKey(entry.getKey())) { |
| 157 | ret.setProperty((String) entry.getKey(), (String) entry.getValue()); |
| 158 | } |
| 159 | } |
| 160 | } catch (IOException e) { |
| 161 | throw new RuntimeException("Cannot load properties from resource "+variant, e); |
| 162 | } |
| 163 | |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | |
| 169 | return true; |
| 170 | } |
| 171 | |
| 172 | }); |
| 173 | |
| 174 | return ret; |
| 175 | } |
| 176 | |
| 177 | } |