diff options
Diffstat (limited to 'sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/injection/PojoObjectFactory.java')
-rw-r--r-- | sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/injection/PojoObjectFactory.java | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/injection/PojoObjectFactory.java b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/injection/PojoObjectFactory.java new file mode 100644 index 0000000000..e3e1874b1e --- /dev/null +++ b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/injection/PojoObjectFactory.java @@ -0,0 +1,75 @@ +package org.apache.tuscany.core.injection; + +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.Collections; +import java.util.List; + +import org.apache.tuscany.core.builder.ObjectFactory; + +/** + * Creates new instances of a Java class, calling a given set of injectors to configure the instance + * + * @version $Rev$ $Date$ + * @see Injector + */ +public class PojoObjectFactory<T> implements ObjectFactory<T> { + + // ---------------------------------- + // Constants + // ---------------------------------- + + private static final ObjectFactory[] NO_INIT_PARAM = {}; + + private static final List<Injector> NO_SETTER_PARAM = Collections.EMPTY_LIST; + + // ---------------------------------- + // Fields + // ---------------------------------- + + private final Constructor<T> ctr; + + private final ObjectFactory<?>[] initParamsArray; + + private final List<Injector> setters; + + // ---------------------------------- + // Constructors + // ---------------------------------- + + public PojoObjectFactory(Constructor<T> ctr, List<ObjectFactory> initParams, List<Injector> setters) { + this.ctr = ctr; + if (initParams != null && initParams.size() > 0) { + initParamsArray = initParams.toArray(new ObjectFactory[initParams.size()]); + } else { + initParamsArray = NO_INIT_PARAM; + } + this.setters = setters != null ? setters : NO_SETTER_PARAM; + } // ---------------------------------- + + // Methods + // ---------------------------------- + + public T getInstance() throws ObjectCreationException { + Object[] initargs = new Object[initParamsArray.length]; + // create the constructor arg array + for (int i = 0; i < initParamsArray.length; i++) { + ObjectFactory<?> objectFactory = initParamsArray[i]; + initargs[i] = objectFactory.getInstance(); + } + try { + T instance = ctr.newInstance(initargs); + // interate through the injectors and inject the instance + for (Injector setter : setters) { + setter.inject(instance); + } + return instance; + } catch (InstantiationException e) { + throw new AssertionError("Class is not instantiable [" + ctr.getDeclaringClass().getName() + "]"); + } catch (IllegalAccessException e) { + throw new AssertionError("Constructor is not accessible [" + ctr + "]"); + } catch (InvocationTargetException e) { + throw new ObjectCreationException("Exception thrown by constructor [" + ctr + "]", e); + } + } +} |