| 1 | package com.hammurapi.common.concurrent; |
| 2 | |
| 3 | import java.io.BufferedReader; |
| 4 | import java.io.IOException; |
| 5 | import java.io.InputStreamReader; |
| 6 | import java.lang.reflect.InvocationHandler; |
| 7 | import java.lang.reflect.Method; |
| 8 | import java.lang.reflect.Proxy; |
| 9 | import java.net.URL; |
| 10 | import java.util.ArrayList; |
| 11 | import java.util.Arrays; |
| 12 | import java.util.Enumeration; |
| 13 | import java.util.HashSet; |
| 14 | import java.util.List; |
| 15 | import java.util.Set; |
| 16 | import java.util.concurrent.ExecutorService; |
| 17 | import java.util.concurrent.locks.Lock; |
| 18 | import java.util.concurrent.locks.ReadWriteLock; |
| 19 | import java.util.concurrent.locks.ReentrantReadWriteLock; |
| 20 | |
| 21 | import com.hammurapi.common.Context; |
| 22 | import com.hammurapi.convert.Converter; |
| 23 | |
| 24 | public class LocalStringPropertySet extends LocalAbstractPropertySet<String, String> { |
| 25 | |
| 26 | private static final String SETTER_PREFIX = "set"; |
| 27 | private static final int SETTER_PREFIX_LENGTH = SETTER_PREFIX.length(); |
| 28 | private static final String GETTER_PREFIX = "get"; |
| 29 | private static final int GETTER_PREFIX_LENGTH = GETTER_PREFIX.length(); |
| 30 | |
| 31 | private String separator; |
| 32 | private ClassLoader classLoader; |
| 33 | private ReadWriteLock lock; |
| 34 | private Set<String> immutableClasses = new HashSet<String>(); |
| 35 | |
| 36 | public LocalStringPropertySet( |
| 37 | ExecutorService executorService, |
| 38 | Converter converter, |
| 39 | Context context, |
| 40 | ClassLoader classLoader, |
| 41 | PropertySet<String>... chain) { |
| 42 | this(executorService, converter, context, "/", classLoader, chain); |
| 43 | } |
| 44 | |
| 45 | public LocalStringPropertySet( |
| 46 | ExecutorService executorService, |
| 47 | Converter converter, |
| 48 | Context context, |
| 49 | String separator, |
| 50 | ClassLoader classLoader, |
| 51 | PropertySet<String>... chain) { |
| 52 | this(executorService, converter, context, separator, classLoader, new ReentrantReadWriteLock(), chain); |
| 53 | this.separator = separator; |
| 54 | this.classLoader = classLoader==null ? getClass().getClassLoader() : classLoader; |
| 55 | } |
| 56 | |
| 57 | protected LocalStringPropertySet( |
| 58 | ExecutorService executorService, |
| 59 | Converter converter, |
| 60 | Context context, |
| 61 | String separator, |
| 62 | ClassLoader classLoader, |
| 63 | ReadWriteLock lock, |
| 64 | PropertySet<String>... chain) { |
| 65 | super(executorService, converter, context, chain); |
| 66 | this.separator = separator; |
| 67 | this.classLoader = classLoader==null ? getClass().getClassLoader() : classLoader; |
| 68 | try { |
| 69 | Enumeration<URL> immutableResources = this.classLoader.getResources("META-INF/services/"+Immutable.class.getName()); |
| 70 | while (immutableResources.hasMoreElements()) { |
| 71 | BufferedReader br = new BufferedReader(new InputStreamReader(immutableResources.nextElement().openStream())); |
| 72 | String l; |
| 73 | while ((l=br.readLine())!=null) { |
| 74 | immutableClasses.add(l.trim()); |
| 75 | } |
| 76 | } |
| 77 | } catch (IOException e) { |
| 78 | throw new PropertySetException("Cannot load list of immutable classes: "+e, e); |
| 79 | } |
| 80 | this.lock = lock; |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | protected String buildPath(int startIdx, Object... elements) { |
| 85 | StringBuilder sb = new StringBuilder(); |
| 86 | for (int i=startIdx; i < elements.length; ++i) { |
| 87 | if (i>startIdx) { |
| 88 | sb.append(separator); |
| 89 | } |
| 90 | sb.append(elements[i]); |
| 91 | } |
| 92 | return sb.toString(); |
| 93 | } |
| 94 | |
| 95 | @Override |
| 96 | protected String buildPath(String prefix, Object... elements) { |
| 97 | StringBuilder sb = new StringBuilder(prefix); |
| 98 | for (int i=0; i < elements.length; ++i) { |
| 99 | sb.append(separator); |
| 100 | sb.append(elements[i]); |
| 101 | } |
| 102 | return sb.toString(); |
| 103 | } |
| 104 | |
| 105 | @Override |
| 106 | protected String buildPath(String prefix, String suffix) { |
| 107 | return prefix+separator+suffix; |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | protected String[] tokenize(String path) { |
| 112 | List<String> ret = new ArrayList<String>(); |
| 113 | for (int idx = path.indexOf(separator); idx!=-1; idx = path.indexOf(separator)) { |
| 114 | ret.add(path.substring(0, idx)); |
| 115 | path = path.substring(idx+separator.length()); |
| 116 | } |
| 117 | if (!path.isEmpty()) { |
| 118 | ret.add(path); |
| 119 | } |
| 120 | return ret.toArray(new String[ret.size()]); |
| 121 | } |
| 122 | |
| 123 | @Override |
| 124 | public <T> T getAdapter(final Class<T> targetType, final Context context) { |
| 125 | if (targetType.isInterface()) { |
| 126 | InvocationHandler invocationHandler = new InvocationHandler() { |
| 127 | |
| 128 | @Override |
| 129 | public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| 130 | if (method.getDeclaringClass().equals(targetType)) { |
| 131 | Class<?>[] parameterTypes = method.getParameterTypes(); |
| 132 | Class<?> returnType = method.getReturnType(); |
| 133 | String name = method.getName(); |
| 134 | if (name.startsWith(GETTER_PREFIX) && name.length()>GETTER_PREFIX.length() && parameterTypes.length==0 && !void.class.equals(returnType)) { // Getters |
| 135 | String firstChar = name.substring(GETTER_PREFIX_LENGTH, GETTER_PREFIX_LENGTH+1).toLowerCase(); |
| 136 | String pName = name.length()>GETTER_PREFIX.length()+1 ? firstChar + name.substring(GETTER_PREFIX.length()+1) : firstChar; |
| 137 | Object ret = get(pName, returnType); |
| 138 | if (ret==null || returnType.isInstance(ret)) { |
| 139 | return ret; |
| 140 | } |
| 141 | Object cRet = converter.convert(ret, returnType, context); |
| 142 | if (cRet==null) { |
| 143 | throw new PropertySetException("Cannot convert from "+ret+" to "+returnType); |
| 144 | } |
| 145 | return cRet; |
| 146 | } |
| 147 | |
| 148 | if (name.startsWith(SETTER_PREFIX) && name.length()>SETTER_PREFIX.length() && parameterTypes.length==1 && void.class.equals(returnType)) { // Setters |
| 149 | String firstChar = name.substring(SETTER_PREFIX_LENGTH, SETTER_PREFIX_LENGTH+1).toLowerCase(); |
| 150 | String pName = name.length()>SETTER_PREFIX.length()+1 ? firstChar + name.substring(SETTER_PREFIX.length()+1) : firstChar; |
| 151 | set(pName, args[0]); |
| 152 | return null; |
| 153 | } |
| 154 | |
| 155 | // Invoke invocable |
| 156 | Object ret = LocalStringPropertySet.this.invoke(name, args); |
| 157 | if (ret==null || returnType.isInstance(ret)) { |
| 158 | return ret; |
| 159 | } |
| 160 | Object cRet = converter.convert(ret, returnType, context); |
| 161 | if (cRet==null) { |
| 162 | throw new PropertySetException("Cannot convert from "+ret+" to "+returnType); |
| 163 | } |
| 164 | return cRet; |
| 165 | } |
| 166 | // Object methods. |
| 167 | return method.invoke(proxy, args); |
| 168 | } |
| 169 | |
| 170 | }; |
| 171 | return (T) Proxy.newProxyInstance(classLoader, new Class[] {targetType}, invocationHandler); |
| 172 | } |
| 173 | |
| 174 | return null; |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | protected <T> T version(T source) { |
| 179 | if (source==null) { |
| 180 | return source; |
| 181 | } |
| 182 | Class<? extends Object> sourceClass = source.getClass(); |
| 183 | if (immutableClasses.contains(sourceClass.getName())) { |
| 184 | return source; |
| 185 | } |
| 186 | if (sourceClass.getAnnotation(Immutable.class)!=null) { |
| 187 | return source; |
| 188 | } |
| 189 | Versionable<T> v = converter.convert(source, Versionable.class, context); |
| 190 | if (v!=null) { |
| 191 | return v.createVersion(); |
| 192 | } |
| 193 | if (source instanceof Cloneable) { |
| 194 | try { |
| 195 | return (T) sourceClass.getMethod("clone").invoke(sourceClass); |
| 196 | } catch (Exception e) { |
| 197 | throw new PropertySetException("Cannot version "+source+" by cloning"); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | return source; // Not immutable, not versionable, not cloneable - return AS IS. |
| 202 | } |
| 203 | |
| 204 | @Override |
| 205 | protected AbstractPropertySet<String, String> newInstance(String key) { |
| 206 | PropertySet<String>[] subChain = Arrays.copyOf(shadows, shadows.length); |
| 207 | for (int i=0; i<subChain.length; ++i) { |
| 208 | subChain[i] = new StringSubSet(shadows[i], key, separator); |
| 209 | } |
| 210 | return new LocalStringPropertySet( |
| 211 | executorService, |
| 212 | converter, |
| 213 | context, |
| 214 | separator, |
| 215 | classLoader, |
| 216 | lock, |
| 217 | subChain); |
| 218 | } |
| 219 | |
| 220 | @Override |
| 221 | public Lock readLock() { |
| 222 | return lock.readLock(); |
| 223 | } |
| 224 | |
| 225 | @Override |
| 226 | public Lock writeLock() { |
| 227 | return lock.writeLock(); |
| 228 | } |
| 229 | } |