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Diffstat (limited to 'sca-java-1.x/tags/0.99-incubating/modules/topology-xml/src/main/java/org/apache/tuscany/sca/topology/xml/BaseArtifactProcessor.java')
-rw-r--r-- | sca-java-1.x/tags/0.99-incubating/modules/topology-xml/src/main/java/org/apache/tuscany/sca/topology/xml/BaseArtifactProcessor.java | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/0.99-incubating/modules/topology-xml/src/main/java/org/apache/tuscany/sca/topology/xml/BaseArtifactProcessor.java b/sca-java-1.x/tags/0.99-incubating/modules/topology-xml/src/main/java/org/apache/tuscany/sca/topology/xml/BaseArtifactProcessor.java new file mode 100644 index 0000000000..97d596a42e --- /dev/null +++ b/sca-java-1.x/tags/0.99-incubating/modules/topology-xml/src/main/java/org/apache/tuscany/sca/topology/xml/BaseArtifactProcessor.java @@ -0,0 +1,280 @@ +/* + * 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.topology.xml; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.StringTokenizer; + +import javax.xml.XMLConstants; +import javax.xml.namespace.QName; +import javax.xml.parsers.DocumentBuilderFactory; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.XMLStreamReader; +import javax.xml.stream.XMLStreamWriter; + + +import org.apache.tuscany.sca.assembly.AssemblyFactory; +import org.apache.tuscany.sca.assembly.Binding; +import org.apache.tuscany.sca.assembly.Contract; +import org.apache.tuscany.sca.assembly.Implementation; +import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.contribution.service.ContributionResolveException; +import org.apache.tuscany.sca.interfacedef.InterfaceContract; +import org.apache.tuscany.sca.topology.TopologyFactory; + +/** + * A base class with utility methods for the other artifact processors in this module. + * + * @version $Rev$ $Date$ + */ +public abstract class BaseArtifactProcessor implements Constants { + + protected TopologyFactory topologyFactory; + protected AssemblyFactory assemblyFactory; + protected StAXArtifactProcessor<Object> extensionProcessor; + + private static final DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance(); + static { + domFactory.setNamespaceAware(true); + } + + /** + * Construct a new BaseArtifactProcessor. + * @param factory + * @param policyFactory + */ + @SuppressWarnings("unchecked") + public BaseArtifactProcessor(TopologyFactory topologyFactory, AssemblyFactory assemblyFactory, StAXArtifactProcessor extensionProcessor) { + this.topologyFactory = topologyFactory; + this.assemblyFactory = assemblyFactory; + this.extensionProcessor = extensionProcessor; + } + + /** + * Returns the string value of an attribute. + * @param reader + * @param name + * @return + */ + protected String getString(XMLStreamReader reader, String name) { + return reader.getAttributeValue(null, name); + } + + /** + * Returns the qname value of an attribute. + * @param reader + * @param name + * @return + */ + protected QName getQName(XMLStreamReader reader, String name) { + String qname = reader.getAttributeValue(null, name); + return getQNameValue(reader, qname); + } + + /** + * Returns the value of xsi:type attribute + * @param reader The XML stream reader + * @return The QName of the type, if the attribute is not present, null is + * returned. + */ + protected QName getXSIType(XMLStreamReader reader) { + String qname = reader.getAttributeValue(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "type"); + return getQNameValue(reader, qname); + } + + /** + * Returns a qname from a string. + * @param reader + * @param value + * @return + */ + protected QName getQNameValue(XMLStreamReader reader, String value) { + if (value != null) { + int index = value.indexOf(':'); + String prefix = index == -1 ? "" : value.substring(0, index); + String localName = index == -1 ? value : value.substring(index + 1); + String ns = reader.getNamespaceContext().getNamespaceURI(prefix); + if (ns == null) { + ns = ""; + } + return new QName(ns, localName, prefix); + } else { + return null; + } + } + + /** + * Returns the boolean value of an attribute. + * @param reader + * @param name + * @return + */ + protected boolean getBoolean(XMLStreamReader reader, String name) { + String value = reader.getAttributeValue(null, name); + if (value == null) { + value = Boolean.toString(false); + } + return Boolean.valueOf(value); + } + + /** + * Returns the value of an attribute as a list of qnames. + * @param reader + * @param name + * @return + */ + protected List<QName> getQNames(XMLStreamReader reader, String name) { + String value = reader.getAttributeValue(null, name); + if (value != null) { + List<QName> qnames = new ArrayList<QName>(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + qnames.add(getQName(reader, tokens.nextToken())); + } + return qnames; + } else { + return Collections.emptyList(); + } + } + + /** + * Start an element. + * @param uri + * @param name + * @param attrs + * @throws XMLStreamException + */ + protected void writeStart(XMLStreamWriter writer, String uri, String name, XAttr... attrs) throws XMLStreamException { + writer.writeStartElement(uri, name); + writeAttributes(writer, attrs); + } + + /** + * Start an element. + * @param writer + * @param name + * @param attrs + * @throws XMLStreamException + */ + protected void writeStart(XMLStreamWriter writer, String name, XAttr... attrs) throws XMLStreamException { + writer.writeStartElement(TUSCANY_TOPOLOGY_10_NS, name); + writeAttributes(writer, attrs); + } + + /** + * End an element. + * @param writer + * @throws XMLStreamException + */ + protected void writeEnd(XMLStreamWriter writer) throws XMLStreamException { + writer.writeEndElement(); + } + + /** + * Start a document. + * @param writer + * @throws XMLStreamException + */ + protected void writeStartDocument(XMLStreamWriter writer, String name, XAttr... attrs) throws XMLStreamException { + writer.writeStartDocument(); + writer.setDefaultNamespace(TUSCANY_TOPOLOGY_10_NS); + writeStart(writer, name, attrs); + writer.writeDefaultNamespace(TUSCANY_TOPOLOGY_10_NS); + } + + /** + * End a document. + * @param writer + * @throws XMLStreamException + */ + protected void writeEndDocument(XMLStreamWriter writer) throws XMLStreamException { + writer.writeEndDocument(); + } + + /** + * Write attributes to the current element. + * @param writer + * @param attrs + * @throws XMLStreamException + */ + protected void writeAttributes(XMLStreamWriter writer, XAttr... attrs) throws XMLStreamException { + for (XAttr attr : attrs) { + if (attr != null) + attr.write(writer); + } + } + + /** + * Resolve an implementation. + * @param implementation + * @param resolver + * @return + * @throws ContributionResolveException + */ + protected Implementation resolveImplementation(Implementation implementation, ModelResolver resolver) throws ContributionResolveException { + if (implementation != null) { + if (implementation.isUnresolved()) { + implementation = resolver.resolveModel(Implementation.class, implementation); + + // Lazily resolve implementations + if (implementation.isUnresolved()) { + extensionProcessor.resolve(implementation, resolver); + if (!implementation.isUnresolved()) { + resolver.addModel(implementation); + } + } + } + } + return implementation; + } + + /** + * Resolve interface, callback interface and bindings on a list of contracts. + * @param contracts the list of contracts + * @param resolver the resolver to use to resolve models + */ + protected <C extends Contract> void resolveContracts(List<C> contracts, ModelResolver resolver) throws ContributionResolveException { + for (Contract contract: contracts) { + + // Resolve the interface contract + InterfaceContract interfaceContract = contract.getInterfaceContract(); + if (interfaceContract != null) { + extensionProcessor.resolve(interfaceContract, resolver); + } + + // Resolve bindings + for (int i = 0, n = contract.getBindings().size(); i < n; i++) { + Binding binding = contract.getBindings().get(i); + extensionProcessor.resolve(binding, resolver); + } + + // Resolve callback bindings + if (contract.getCallback() != null) { + for (int i = 0, n = contract.getCallback().getBindings().size(); i < n; i++) { + Binding binding = contract.getCallback().getBindings().get(i); + extensionProcessor.resolve(binding, resolver); + } + } + } + } + +} |