diff options
Diffstat (limited to 'israfil-foundation-dynamic/src/main/java/net/israfil/foundation/dynamic/DynamicUtil.java')
| -rw-r--r-- | israfil-foundation-dynamic/src/main/java/net/israfil/foundation/dynamic/DynamicUtil.java | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/israfil-foundation-dynamic/src/main/java/net/israfil/foundation/dynamic/DynamicUtil.java b/israfil-foundation-dynamic/src/main/java/net/israfil/foundation/dynamic/DynamicUtil.java new file mode 100644 index 0000000..9c165bc --- /dev/null +++ b/israfil-foundation-dynamic/src/main/java/net/israfil/foundation/dynamic/DynamicUtil.java @@ -0,0 +1,297 @@ +/*
+ * Copyright (c) 2003-2009 Israfil Consulting Services Corporation
+ * Copyright (c) 2003-2009 Christian Edward Gruber
+ * All Rights Reserved
+ *
+ * This software is licensed under the Berkeley Standard Distribution license,
+ * (BSD license), as defined below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of Israfil Consulting Services nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * $Id: DynamicUtil.java 91 2006-08-03 21:38:24Z cgruber $
+ */
+package net.israfil.foundation.dynamic;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.StringTokenizer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.israfil.foundation.collections.ArrayUtils;
+
+/**
+ * Utilities used for the implementation of Dynamic and
+ * related interfaces.
+ *
+ * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
+ */
+public final class DynamicUtil {
+ private static Logger logger = Logger.getLogger(DynamicUtil.class.getName());
+
+ private DynamicUtil() {}
+
+ static Map<String, Class<?>> _primitiveTypes = new HashMap<String, Class<?>>();
+ static Map<Class<?>, Class<?>> _primitiveTypeEquivalents = new HashMap<Class<?>, Class<?>>();
+ static Map<Class<?>, Class<?>> _boxedTypeEquivalents = new HashMap<Class<?>, Class<?>>();
+ static {
+ _primitiveTypes.put("boolean",boolean.class);
+ _primitiveTypeEquivalents.put(Boolean.class,boolean.class);
+ _boxedTypeEquivalents.put(boolean.class,Boolean.class);
+ _primitiveTypes.put("int",int.class);
+ _primitiveTypeEquivalents.put(Integer.class,int.class);
+ _boxedTypeEquivalents.put(int.class,Integer.class);
+ _primitiveTypes.put("long",long.class);
+ _primitiveTypeEquivalents.put(Long.class,long.class);
+ _boxedTypeEquivalents.put(long.class,Long.class);
+ _primitiveTypes.put("short",short.class);
+ _primitiveTypeEquivalents.put(Short.class,short.class);
+ _boxedTypeEquivalents.put(short.class,Short.class);
+ _primitiveTypes.put("byte",byte.class);
+ _primitiveTypeEquivalents.put(Byte.class,byte.class);
+ _boxedTypeEquivalents.put(byte.class,Byte.class);
+ _primitiveTypes.put("char",char.class);
+ _primitiveTypeEquivalents.put(Character.class,char.class);
+ _boxedTypeEquivalents.put(char.class,Character.class);
+ _primitiveTypes.put("double",double.class);
+ _primitiveTypeEquivalents.put(Double.class,double.class);
+ _boxedTypeEquivalents.put(double.class,Double.class);
+ _primitiveTypes.put("float",float.class);
+ _primitiveTypeEquivalents.put(Float.class,float.class);
+ _boxedTypeEquivalents.put(float.class,Float.class);
+ }
+ public static boolean hasPrimitiveTypeEquivalent(Class<?> c) {
+ return _primitiveTypeEquivalents.containsKey(c);
+ }
+
+ public static Class<?> getPrimitiveTypeEquivalent(Class<?> c) {
+ return _primitiveTypeEquivalents.get(c);
+ }
+
+ public static boolean hasBoxedTypeEquivalent(Class<?> c) {
+ return _boxedTypeEquivalents.containsKey(c);
+ }
+
+ public static Class<?> getBoxedTypeEquivalent(Class<?> c) {
+ return _boxedTypeEquivalents.get(c);
+ }
+
+ protected static final Map<Class<?>, Set<Class<?>>> classes = new HashMap<Class<?>, Set<Class<?>>>();
+
+ public static Set<Class<?>> getAllParentTypes(Class<?> c) {
+ if (!classes.containsKey(c)) {
+ Set<Class<?>> parents = new HashSet<Class<?>>();
+ for (Class<?> cType = c; cType != Object.class && cType != null; cType = cType
+ .getSuperclass()) {
+ parents.add(cType);
+ addSuperInterfaces(parents,cType);
+ }
+ parents.add(Object.class);
+ parents.remove(c);
+ classes.put(c,parents);
+ }
+ return classes.get(c);
+ }
+
+ public static void addSuperInterfaces(Set<Class<?>> set, Class<?> c) {
+ if (c == null || c.getInterfaces() == null) return;
+ for (Class<?> i : c.getInterfaces()) {
+ set.add(i);
+ addSuperInterfaces(set,i);
+ }
+ }
+
+ /**
+ * Conveniently get a field from an object, automatically trapping
+ * exceptions and returning the Field or null if no such field exists.
+ */
+ public static Field getField(Object receiver, String attributeName) {
+ Field f = null;
+ try {
+ f = receiver.getClass().getField(attributeName);
+ } catch (NoSuchFieldException e) {
+ return null;
+ }
+ return f;
+ }
+
+
+
+ /**
+ * @see org.israfil.maveric.Dynamic#respondsTo(java.lang.String)
+ */
+ public static boolean respondsTo(Object receiver, String selector) {
+ return (getMethodForSelector(receiver,selector) != null);
+ }
+
+ public static Method getMethodForSelector(Object receiver, String selector) {
+ if (receiver instanceof Class)
+ return getMethodForSelector((Class<?>) receiver, selector);
+ return getMethodForSelector(receiver.getClass(),selector);
+ }
+
+ public static Method getMethodForSelector(Class<?> receiverClass,
+ String selector) {
+ try {
+ return _getMethodForSelector(receiverClass,selector);
+ } catch (ClassNotFoundException e) {
+ throw new RuntimeException(e);
+ } catch (NoSuchMethodException e) {
+ return null;
+ }
+ }
+
+ protected static Method _getMethodForSelector(Class<?> receiverClass,
+ String selector) throws ClassNotFoundException,
+ NoSuchMethodException {
+ StringTokenizer st = new StringTokenizer(selector,":");
+ Class<?>[] paramTypes = new Class[st.countTokens() - 1];
+ String methodName = st.nextToken();
+ ClassLoader loader = Thread.currentThread().getContextClassLoader();
+ for (int i = 0; st.hasMoreTokens(); i++) {
+ String className = st.nextToken();
+ if (DynamicUtil._primitiveTypes.containsKey(className))
+ paramTypes[i] = (Class<?>) DynamicUtil._primitiveTypes
+ .get(className);
+ else paramTypes[i] = loader.loadClass(className);
+ }
+ return receiverClass.getMethod(methodName,paramTypes);
+ }
+
+ /**
+ * @see org.israfil.maveric.Dynamic#perform(java.lang.String, java.lang.Object[])
+ */
+ public static Object performOn(Object receiver, String selector, Object ... parameters) {
+ if (parameters == null) parameters = new Object[]{};
+ Method m = getMethodForSelector(receiver,selector);
+ try {
+ if (m != null) return m.invoke(receiver,parameters);
+ //else return null;
+ else throw new NoSuchMethodError("No public method defined with selector \""+selector+"\"");
+ } catch (InvocationTargetException ite) {
+ logger.log(Level.FINE,ite.getClass().getName()+" thrown attempting to invoke selector: " + selector + " on "+receiver,ite);
+ if (ite.getCause() != null) throw new RuntimeException(ite.getCause());
+ else throw new RuntimeException(ite);
+ } catch (IllegalAccessException iae) {
+ logger.log(Level.FINE,iae.getClass().getName()+" thrown attempting to invoke selector: " + selector + " on "+receiver,iae);
+ throw new RuntimeException(iae);
+ }
+ }
+
+ /**
+ * Construct an object of the given named class with the provided
+ * constructor parameters. If there is no such class or no
+ * constructor is found that is appropriate to these parameters,
+ * the method will return null;
+ *
+ * @param className The fully qualified name of a Class object to be instantiated.
+ * @param parameters Optional parameters for the discovered constructor
+ * @return an instance of the named class, or null if no such class or constructor is found.
+ */
+ public static Object construct(String className, Object ... parameters) {
+ try {
+ Class<?> clazz = Thread.currentThread().getContextClassLoader()
+ .loadClass(className);
+ return construct(clazz,parameters);
+ } catch (ClassNotFoundException e) {
+ logger.log(Level.FINE,e.getClass().getName()+" thrown attempting to construct a " + className + ".", e);
+ return null;
+ }
+ }
+ /**
+ * Construct an object of the given class with the provided
+ * constructor parameters. If there is no such class or no
+ * constructor is found that is appropriate to these parameters,
+ * the method will return null;
+ *
+ * @param c A Class object to be instantiated.
+ * @param parameters Optional parameters for the discovered constructor
+ * @return an instance of the named class, or null if no such class or constructor is found.
+ */
+ public static <T> T construct(Class<T> c, Object ... parameters) {
+ Class<?> [] parmTypes = new Class<?>[parameters.length];
+ for (int i = 0; i < parmTypes.length; i++) {
+ parmTypes[i] = parameters[i].getClass();
+ }
+ return construct(c,parmTypes,parameters);
+ }
+
+ /**
+ * Construct an object of the given named class with the provided
+ * constructor parameter types and values. If there is no such class
+ * or no constructor is found that is appropriate to these parameters,
+ * the method will return null;
+ *
+ * @param className The fully qualified name of a Class object to be instantiated.
+ * @param parameterTypes The types that form the desired constructor's method signature
+ * @param parameters Optional parameters for the discovered constructor
+ * @return an instance of the named class, or null if no such class or constructor is found.
+ */
+ public static Object construct(String className, Class<?>[] parameterTypes,
+ Object... parameters) {
+ try {
+ Class<?> clazz = Thread.currentThread().getContextClassLoader()
+ .loadClass(className);
+ return construct(clazz, parameterTypes,parameters);
+ } catch (ClassNotFoundException e) {
+ logger.log(Level.FINE,e.getClass().getName()+" thrown attempting to construct a " + className + ".", e);
+ return null;
+ }
+ }
+
+ /**
+ * Construct an object of the given class with the provided
+ * constructor parameter types and values. If there is no such class
+ * or no constructor is found that is appropriate to these parameters,
+ * the method will return null;
+ *
+ * @param c A Class object to be instantiated.
+ * @param parameterTypes The types that form the desired constructor's method signature
+ * @param parameters Optional parameters for the discovered constructor
+ * @return an instance of the named class, or null if no such class or constructor is found.
+ */
+ @SuppressWarnings("unchecked")
+ public static <T> T construct(Class<T> c, Class<?>[] parameterTypes,
+ Object... parameters) {
+ try {
+ Constructor<T>[] constructors = (Constructor<T>[]) c.getDeclaredConstructors();
+ for (Constructor<T> constructor : constructors) {
+ if (ArrayUtils.equivalent(parameterTypes,constructor.getParameterTypes())) {
+ return (T)constructor.newInstance(parameters);
+ }
+ }
+ return null;
+ } catch (Exception e) {
+ logger.log(Level.FINE,e.getClass().getName()+" thrown attempting to construct a " + c.getName() + ".", e);
+ return null;
+ }
+ }
+
+}
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