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package org.apache.camel.util; |
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import java.io.BufferedInputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.Properties; |
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import java.util.concurrent.ConcurrentHashMap; |
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import org.apache.camel.spi.Injector; |
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public class FactoryFinder { |
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private final String path; |
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private final ConcurrentHashMap classMap = new ConcurrentHashMap(); |
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public FactoryFinder() { |
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this("META-INF/services/org/apache/camel/"); |
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} |
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public FactoryFinder(String path) { |
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this.path = path; |
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} |
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public Object newInstance(String key) throws IllegalAccessException, InstantiationException, IOException, |
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ClassNotFoundException { |
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return newInstance(key, (String)null); |
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} |
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public Object newInstance(String key, String propertyPrefix) throws IllegalAccessException, |
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InstantiationException, IOException, ClassNotFoundException { |
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Class clazz = findClass(key, propertyPrefix); |
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return clazz.newInstance(); |
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} |
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public Object newInstance(String key, Injector injector) throws IOException, ClassNotFoundException { |
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return newInstance(key, injector, (String)null); |
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} |
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public Object newInstance(String key, Injector injector, String propertyPrefix) throws IOException, |
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ClassNotFoundException { |
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Class type = findClass(key, propertyPrefix); |
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return injector.newInstance(type); |
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} |
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public <T> T newInstance(String key, Injector injector, Class<T> expectedType) throws IOException, |
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ClassNotFoundException { |
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return newInstance(key, injector, null, expectedType); |
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} |
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public <T> T newInstance(String key, Injector injector, String propertyPrefix, Class<T> expectedType) |
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throws IOException, ClassNotFoundException { |
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Class type = findClass(key, propertyPrefix); |
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Object value = injector.newInstance(type); |
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if (expectedType.isInstance(value)) { |
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return expectedType.cast(value); |
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} else { |
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throw new ClassCastException("Not instanceof " + expectedType.getName() + " value: " + value); |
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} |
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} |
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public <T> List<T> newInstances(String key, Injector injector, Class<T> type) throws IOException, |
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ClassNotFoundException { |
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List<Class> list = findClasses(key); |
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List<T> answer = new ArrayList<T>(list.size()); |
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answer.add(newInstance(key, injector, type)); |
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return answer; |
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} |
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public Class findClass(String key) throws ClassNotFoundException, IOException { |
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return findClass(key, null); |
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} |
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public Class findClass(String key, String propertyPrefix) throws ClassNotFoundException, IOException { |
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if (propertyPrefix == null) { |
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propertyPrefix = ""; |
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} |
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Class clazz = (Class)classMap.get(propertyPrefix + key); |
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if (clazz == null) { |
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clazz = newInstance(doFindFactoryProperies(key), propertyPrefix); |
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classMap.put(propertyPrefix + key, clazz); |
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} |
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return clazz; |
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} |
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public List<Class> findClasses(String key) throws ClassNotFoundException, IOException { |
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return findClasses(key, null); |
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} |
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public List<Class> findClasses(String key, String propertyPrefix) throws ClassNotFoundException, |
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IOException { |
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Class type = findClass(key, propertyPrefix); |
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return Collections.singletonList(type); |
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} |
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private Class newInstance(Properties properties, String propertyPrefix) throws ClassNotFoundException, |
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IOException { |
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String className = properties.getProperty(propertyPrefix + "class"); |
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if (className == null) { |
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throw new IOException("Expected property is missing: " + propertyPrefix + "class"); |
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} |
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Class clazz = null; |
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ClassLoader loader = Thread.currentThread().getContextClassLoader(); |
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if (loader != null) { |
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try { |
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clazz = loader.loadClass(className); |
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} catch (ClassNotFoundException e) { |
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} |
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} |
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if (clazz == null) { |
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clazz = FactoryFinder.class.getClassLoader().loadClass(className); |
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} |
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return clazz; |
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} |
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private Properties doFindFactoryProperies(String key) throws IOException { |
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String uri = path + key; |
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ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); |
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if (classLoader == null) { |
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classLoader = getClass().getClassLoader(); |
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} |
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InputStream in = classLoader.getResourceAsStream(uri); |
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if (in == null) { |
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in = FactoryFinder.class.getClassLoader().getResourceAsStream(uri); |
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if (in == null) { |
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throw new NoFactoryAvailableException(uri); |
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} |
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} |
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BufferedInputStream reader = null; |
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try { |
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reader = new BufferedInputStream(in); |
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Properties properties = new Properties(); |
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properties.load(reader); |
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return properties; |
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} finally { |
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try { |
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reader.close(); |
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} catch (Exception ignore) { |
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} |
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} |
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} |
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} |