Java tutorial
/* * Copyright (c) 2005-2009, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. 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.wso2.carbon.governance.metadata.provider; import org.apache.axiom.om.OMAbstractFactory; import org.apache.axiom.om.OMElement; import org.apache.axiom.om.OMFactory; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.wso2.carbon.governance.metadata.Base; import org.wso2.carbon.governance.metadata.models.endpoint.HTTPEndpointV1; import org.wso2.carbon.governance.metadata.provider.util.Util; import org.wso2.carbon.registry.core.Registry; import org.wso2.carbon.registry.core.Resource; import org.wso2.carbon.registry.core.exceptions.RegistryException; import org.wso2.carbon.governance.metadata.Constants; import org.wso2.carbon.governance.metadata.exception.MetadataException; import javax.xml.namespace.QName; import javax.xml.stream.XMLStreamException; import java.util.*; public class HTTPEndpointProviderV1 implements BaseProvider { private static final Log log = LogFactory.getLog(HTTPEndpointProviderV1.class); private final String mediaType; private final String versionMediaType; public HTTPEndpointProviderV1(String mediaType, String versionMediaType) { this.mediaType = mediaType; this.versionMediaType = versionMediaType; } public String getVersionMediaType() { return versionMediaType; } public String getMediaType() { return mediaType; } @Override public Resource buildResource(Base metadata, Resource resource) throws MetadataException { try { String content = getGeneratedMetadataOMElement(metadata).toStringWithConsume(); resource.setContent(content); resource.setMediaType(metadata.getMediaType()); resource.setUUID(metadata.getUUID()); } catch (XMLStreamException e) { log.error("Xml stream exception occurred while building resource content " + e.getMessage()); throw new MetadataException("Xml stream exception occurred while building resource content", e); } catch (RegistryException e) { throw new MetadataException(e.getMessage(), e); } return resource; } @Override public Resource updateResource(Base newMetadata, Resource resource) throws MetadataException { return buildResource(newMetadata, resource); } @Override public Base get(Resource resource, Registry registry) throws MetadataException { try { byte[] contentBytes = (byte[]) resource.getContent(); OMElement root = Util.buildOMElement(contentBytes); Map<String, List<String>> propBag = Util.getPropertyBag(root); return getFilledBean(root, propBag, registry); } catch (RegistryException e) { throw new MetadataException( "Error occurred while obtaining resource metadata content uuid = " + resource.getUUID(), e); } } private HTTPEndpointV1 getFilledBean(OMElement root, Map<String, List<String>> propBag, Registry registry) throws MetadataException { Map<String, List<String>> attributeMap = new HashMap<String, List<String>>(); OMElement attributes = root.getFirstChildWithName(new QName(Constants.CONTENT_ATTRIBUTE_EL_ROOT_NAME)); String uuid = attributes.getFirstChildWithName(new QName(Constants.ATTRIBUTE_UUID)).getText(); String name = attributes.getFirstChildWithName(new QName(Constants.ATTRIBUTE_METADATA_NAME)).getText(); Iterator itr = attributes.getChildren(); while (itr.hasNext()) { OMElement el = (OMElement) itr.next(); String key = el.getLocalName(); List<String> valList = new ArrayList<String>(); Iterator<OMElement> entries = el.getChildrenWithLocalName(Constants.ENTRY_KEY); if (entries.hasNext()) { while (entries.hasNext()) { OMElement entry = entries.next(); valList.add(entry.getText()); } } else { valList.add(el.getText()); } attributeMap.put(key, valList); } return new HTTPEndpointV1(registry, name, uuid, propBag, attributeMap); } private void createAttributesContent(HTTPEndpointV1 httpEndpointV1, OMElement element) throws MetadataException { OMFactory factory = OMAbstractFactory.getOMFactory(); OMElement uuid = factory.createOMElement(new QName(Constants.ATTRIBUTE_UUID)); uuid.setText(httpEndpointV1.getUUID()); OMElement name = factory.createOMElement(new QName(Constants.ATTRIBUTE_METADATA_NAME)); name.setText(httpEndpointV1.getName()); OMElement endpoint = factory.createOMElement(new QName(HTTPEndpointV1.KEY_URL)); endpoint.setText(httpEndpointV1.getUrl()); element.addChild(uuid); element.addChild(name); element.addChild(endpoint); buildGenericAttributes(httpEndpointV1, element, factory); } private void buildGenericAttributes(HTTPEndpointV1 metadata, OMElement attributeRoot, OMFactory factory) { for (Map.Entry<String, List<String>> entry : metadata.getAttributeMap().entrySet()) { String key = entry.getKey(); List<String> value = entry.getValue(); OMElement attEl = factory.createOMElement(new QName(key)); if (value.size() == 1) { attEl.setText(value.get(0)); } else { for (String s : value) { OMElement entryEl = factory.createOMElement(new QName(Constants.ENTRY_KEY)); entryEl.setText(s); attEl.addChild(entryEl); } } attributeRoot.addChild(attEl); } } private void createPropertiesContent(HTTPEndpointV1 httpEndpointV1, OMElement element) { OMFactory factory = OMAbstractFactory.getOMFactory(); for (Map.Entry<String, List<String>> entry : httpEndpointV1.getPropertyBag().entrySet()) { if (entry.getValue() == null) continue; OMElement attribute = factory.createOMElement(new QName(entry.getKey())); attribute.setText(entry.getValue().get(0)); element.addChild(attribute); } } private OMElement getGeneratedMetadataOMElement(Base metadata) throws MetadataException { OMElement root = Util.getContentRoot(); OMElement attributes = Util.getAttributeRoot(); OMElement properties = Util.getPropertyRoot(); createAttributesContent((HTTPEndpointV1) metadata, attributes); createPropertiesContent((HTTPEndpointV1) metadata, properties); root.addChild(properties); root.addChild(attributes); return root; } }