Java tutorial
/* * Lokomo OneCMDB - An Open Source Software for Configuration * Management of Datacenter Resources * * Copyright (C) 2006 Lokomo Systems AB * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. * * Lokomo Systems AB can be contacted via e-mail: info@lokomo.com or via * paper mail: Lokomo Systems AB, Svrdvgen 27, SE-182 33 * Danderyd, Sweden. * */ package org.onecmdb.core.utils.xpath.commands; import java.io.OutputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Set; import org.apache.commons.jxpath.JXPathContext; import org.apache.commons.jxpath.Pointer; import org.onecmdb.core.ICcb; import org.onecmdb.core.ICmdbTransaction; import org.onecmdb.core.IOneCmdbContext; import org.onecmdb.core.IRfcResult; import org.onecmdb.core.ISession; import org.onecmdb.core.ITicket; import org.onecmdb.core.utils.xpath.IOneCMDBContentGenerator; public class UpdateCommand extends AbstractPathCommand { // Specific arguments to Update Command. private String inputAttributes; // TODO: use spring to do this. private HashMap<String, IOneCMDBContentGenerator> generatorMap = new HashMap<String, IOneCMDBContentGenerator>(); private HashMap<String, String> attributeMap = null; private List<String> attributeOrder = new ArrayList<String>(); private ICmdbTransaction tx; public UpdateCommand(IOneCmdbContext context) { super(context); } public String getInputAttributes() { return inputAttributes; } public void setInputAttributes(String outputAttributes) { this.inputAttributes = outputAttributes; // Reset settings. this.attributeMap = null; } private void parseInputAttributes() { if (this.attributeMap != null) { return; } this.attributeMap = new HashMap<String, String>(); String list = getInputAttributes(); if (list == null || list.equals("")) { return; } // How do we handle this in the easiest way? // The deleimiter is space but it can be inside a // an attribute condition! Need some Tool... String attributes[] = list.split(";"); log.debug("attributes=" + attributes.length); for (String a : attributes) { String split2[] = a.split("=", 2); if (split2.length != 2) { throw new IllegalArgumentException("Wrong fromat on inputAttributes '" + a + "' must be of format variable=value;var2=value2;.."); } String attributeName = split2[0]; String attributeValue = split2[1]; String value = attributeMap.get(attributeName); if (value != null) { throw new IllegalArgumentException("Can't set multiple values to '" + attributeName + "'"); } attributeMap.put(attributeName, attributeValue); attributeOrder.add(attributeName); } } protected String[] getInputAttributeNameAsArray() { // Parse if not already done parseInputAttributes(); return (attributeOrder.toArray(new String[0])); } protected Object getValues(String outputAttribute) { // Parse if not already done parseInputAttributes(); // Fetch the values strings, un parsed if expression. String value = attributeMap.get(outputAttribute); if (value == null) { return (null); } Object parsedValue = null; // Check if it's an expression if (value.startsWith("[")) { if (!value.endsWith("]")) { throw new IllegalArgumentException("ERROR: Value expression must be ended with a ']' "); } String path = value.substring(1); path = path.substring(0, path.length() - 1); JXPathContext context = getXPathContext(); Iterator<Pointer> pointers = (Iterator<Pointer>) context.iteratePointers(path); while (pointers.hasNext()) { Pointer pointer = pointers.next(); parsedValue = pointer.getValue(); // Migth warn here if there exists multiple. } } else { // No need to parse this, will be a String representaion of the value. parsedValue = value; } return (parsedValue); } /** * How the content should ibe interperted. * * For now it's always plain text. * @return */ public String getContentType() { return ("text/plain"); } protected void setupTX() { // Setup the tx. ISession session = getCurrentSession(); if (session == null) { throw new IllegalAccessError("Not logged in."); } ICcb ccb = (ICcb) session.getService(ICcb.class); // The TX is stored in the session. this.tx = ccb.getTx(session); getDataContext().put("tx", this.tx); } protected void processTX() { ISession session = getCurrentSession(); if (session == null) { throw new IllegalAccessError("Not logged in."); } ICcb ccb = (ICcb) session.getService(ICcb.class); // Commit the tx. if (this.tx == null) { throw new IllegalArgumentException("No tx setup!"); } ITicket ticket = ccb.submitTx(tx); IRfcResult result = ccb.waitForTx(ticket); if (result.isRejected()) { throw new IllegalAccessError("Rejected:" + result.getRejectCause()); } } /** * Transfer the content to the stream. * Execute the update. * * @param out */ public void transfer(OutputStream out) { String[] inputAttributes = getInputAttributeNameAsArray(); setupTX(); Iterator<Pointer> iter = getPathPointers(); // Check that we have found the root object. if (!iter.hasNext()) { throw new IllegalArgumentException("No object matching path " + getPath() + " found!"); } while (iter.hasNext()) { Pointer p = (Pointer) iter.next(); JXPathContext context = getRelativeContext(p); for (String outputAttribute : inputAttributes) { /* Iterator<Pointer> outputAttrPointersIter = context.iteratePointers(outputAttribute); while(outputAttrPointersIter.hasNext()) { Pointer vPointer = outputAttrPointersIter.next(); Object values = getValues(outputAttribute); //NodePointer nP = (NodePointer)vPointer; //nP.getImmediateValuePointer().setValue(values); vPointer.setValue(values); } */ Object values = getValues(outputAttribute); if (values == null) { String valueExpr = attributeMap.get(outputAttribute); throw new IllegalArgumentException("No value matching expr " + valueExpr + " found!"); } context.setValue(outputAttribute, values); } } // Process the TX. processTX(); } }