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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/modules/databinding-sdo/src/main/java/org/apache/tuscany/sca/databinding/sdo/SDOContextHelper.java | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/modules/databinding-sdo/src/main/java/org/apache/tuscany/sca/databinding/sdo/SDOContextHelper.java b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/databinding-sdo/src/main/java/org/apache/tuscany/sca/databinding/sdo/SDOContextHelper.java new file mode 100644 index 0000000000..23063317e7 --- /dev/null +++ b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/databinding-sdo/src/main/java/org/apache/tuscany/sca/databinding/sdo/SDOContextHelper.java @@ -0,0 +1,258 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.databinding.sdo; + +import java.lang.reflect.Method; +import java.util.ArrayList; +import java.util.List; +import java.util.Set; + +import javax.xml.datatype.DatatypeFactory; +import javax.xml.namespace.QName; + +import org.apache.tuscany.sca.common.java.collection.LRUCache; +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.databinding.TransformationContext; +import org.apache.tuscany.sca.databinding.TransformationException; +import org.apache.tuscany.sca.databinding.util.DataTypeHelper; +import org.apache.tuscany.sca.extensibility.ClassLoaderContext; +import org.apache.tuscany.sca.interfacedef.DataType; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.interfacedef.util.XMLType; +import org.apache.tuscany.sdo.api.SDOUtil; + +import commonj.sdo.DataObject; +import commonj.sdo.Type; +import commonj.sdo.helper.HelperContext; +import commonj.sdo.helper.TypeHelper; +import commonj.sdo.impl.HelperProvider; + +/** + * Helper class to get TypeHelper from the context + * + * @version $Rev$ $Date$ + */ +public final class SDOContextHelper { + private static final LRUCache<Object, HelperContext> cache = new LRUCache<Object, HelperContext>(1024); + + private static ExtensionPointRegistry registry = null; + private static HelperContext defaultHelperContext; + + private SDOContextHelper() { + } + + /** + * Static method used to set the registry used to locate the SDO implementation provider + * MUST be called before using any other methods on this class + * @param theRegistry + */ + public static void setRegistry( ExtensionPointRegistry theRegistry ) { + registry = theRegistry; + } // end setRegistry + + public static HelperContext getHelperContext(TransformationContext context, boolean source) { + if (context == null) { + return getDefaultHelperContext(); + } + + HelperContext helperContext = null; + Operation op = source ? context.getSourceOperation() : context.getTargetOperation(); + if (op == null) { + DataType<?> dt = source ? context.getSourceDataType() : context.getTargetDataType(); + + helperContext = dt.getMetaData(HelperContext.class); + if (helperContext != null) { + return helperContext; + } + helperContext = SDOUtil.createHelperContext(); + boolean found = register(helperContext, dt); + if (!found) { + helperContext = getDefaultHelperContext(); + } + dt.setMetaData(HelperContext.class, helperContext); + return helperContext; + } else { + return getHelperContext(op); + } + + } + + public static HelperContext getHelperContext(Operation op) { + if (op == null) { + return getDefaultHelperContext(); + } + + HelperContext helperContext = op.getInputType().getMetaData(HelperContext.class); + + if (helperContext != null) { + return helperContext; + } + + // Use the default HelperContext until a type is registered later on + helperContext = getDefaultHelperContext(); + + /* + List<DataType> dataTypes = DataTypeHelper.getDataTypes(op, false); + boolean found = false; + for (DataType d : dataTypes) { + if (register(helperContext, d)) { + found = true; + } + } + if (!found) { + helperContext = getDefaultHelperContext(); + } + */ + op.getInputType().setMetaData(HelperContext.class, helperContext); + return helperContext; + } + + /** + * @param helperContext + * @param dataType + * @return + */ + private static boolean register(HelperContext helperContext, DataType dataType) { + if (dataType == null) { + return false; + } + Set<Class<?>> classes = DataTypeHelper.findClasses(dataType); + boolean found = false; + for (Class<?> cls : classes) { + found = register(helperContext, dataType.getPhysical()) || found; + } + return found; + } + + /** + * FIXME: [rfeng] This is a hack to get the factory out a SDO class + * @param helperContext + * @param javaType + */ + + public static boolean register(HelperContext helperContext, Class javaType) { + if (javaType == null || DataObject.class == javaType) { + return false; + } + try { + Type type = helperContext.getTypeHelper().getType(javaType); + return register(helperContext, type); + } catch (Exception e) { + throw new TransformationException(e); + } + } + + public static boolean register(HelperContext helperContext, Type type) { + if (type != null && (!type.isDataType())) { + try { + Method method = type.getClass().getMethod("getEPackage"); + Object factory = method.invoke(type, new Object[] {}); + method = factory.getClass().getMethod("register", HelperContext.class); + method.invoke(factory, new Object[] {helperContext}); + return true; + } catch (Exception e) { + e.printStackTrace(); + return false; + } + } else { + return false; + } + } + + public static HelperContext getDefaultHelperContext( ) { + // Return a chached value if available... + if( defaultHelperContext != null ) return defaultHelperContext; + + // Try to set up TCCL so that SDO Helper Provider service discovery works in OSGi + if( registry == null ) return null; + + ClassLoader oldTccl = + ClassLoaderContext.setContextClassLoader(SDOContextHelper.class.getClassLoader(), + registry.getServiceDiscovery(), + // SDO Helper Provider + "commonj.sdo.impl.HelperProvider" + ); + try { + // Load the HelperProvider (using the new TCCL) and get the default HelperContext + // cache the returned HelperContext... + ClassLoader tccl = Thread.currentThread().getContextClassLoader(); + HelperProvider.setDefaultInstance(tccl); + defaultHelperContext = HelperProvider.getDefaultContext(); + return defaultHelperContext; + } catch (Exception e ){ + e.printStackTrace(); + return null; + } finally { + if (oldTccl != null) { + Thread.currentThread().setContextClassLoader(oldTccl); + } + } // end try + } // end getDefaultHelperContext() + + public static QName getElement(TransformationContext context) { + if (context == null) { + return SDODataBinding.ROOT_ELEMENT; + } + DataType<?> dataType = context.getTargetDataType(); + Object logical = dataType.getLogical(); + QName elementName = null; + if (logical instanceof XMLType) { + XMLType xmlType = (XMLType)logical; + QName element = xmlType.getElementName(); + if (element != null) { + elementName = element; + } + } + if (elementName == null) { + // Try source type + dataType = context.getSourceDataType(); + logical = dataType.getLogical(); + if (logical instanceof XMLType) { + XMLType xmlType = (XMLType)logical; + QName element = xmlType.getElementName(); + if (element != null) { + elementName = element; + } + } + } + if (elementName != null) { + return elementName; + } else { + return SDODataBinding.ROOT_ELEMENT; + } + } + + public static String generateSchema(HelperContext context, Class<?>[] classes) { + TypeHelper typeHelper = context.getTypeHelper(); + List<Type> types = new ArrayList<Type>(); + for (Class<?> cls : classes) { + Type type = typeHelper.getType(cls); + if (type != null) { + types.add(type); + } + } + return generateSchema(context, types); + } + + public static String generateSchema(HelperContext context, List<Type> types) { + // FIXME: SDO throws IllegalArgumentException for types generated from existing XSDs + return context.getXSDHelper().generate(types); + } +} |