Java tutorial
/* * 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.ode.bpel.compiler; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.ode.bpel.compiler.api.CompilationException; import org.apache.ode.bpel.compiler.bom.Activity; import org.apache.ode.bpel.compiler.bom.AssignActivity; import org.apache.ode.bpel.compiler.bom.Copy; import org.apache.ode.bpel.compiler.bom.ExtensionVal; import org.apache.ode.bpel.compiler.bom.From; import org.apache.ode.bpel.compiler.bom.LiteralVal; import org.apache.ode.bpel.compiler.bom.PartnerLinkVal; import org.apache.ode.bpel.compiler.bom.PropertyVal; import org.apache.ode.bpel.compiler.bom.To; import org.apache.ode.bpel.compiler.bom.VariableVal; import org.apache.ode.bpel.o.DebugInfo; import org.apache.ode.bpel.o.OActivity; import org.apache.ode.bpel.o.OAssign; import org.apache.ode.bpel.o.OVarType; import org.apache.ode.bpel.o.OAssign.RValue; import org.apache.ode.bpel.o.OMessageVarType; import org.apache.ode.utils.DOMUtils; import org.apache.ode.utils.msg.MessageBundle; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.xml.namespace.QName; /** * Generates code for <code><assign></code> activities. * * @author Maciej Szefler ( m s z e f l e r @ g m a i l . c o m ) */ class AssignGenerator extends DefaultActivityGenerator { private static final Log __log = LogFactory.getLog(AssignGenerator.class); private static final AssignGeneratorMessages __cmsgs = MessageBundle.getMessages(AssignGeneratorMessages.class); public OActivity newInstance(Activity src) { return new OAssign(_context.getOProcess(), _context.getCurrent()); } public void compile(OActivity dest, Activity source) { OAssign oassign = (OAssign) dest; AssignActivity ad = (AssignActivity) source; for (Copy scopy : ad.getCopies()) { OAssign.Copy ocopy = new OAssign.Copy(_context.getOProcess()); ocopy.keepSrcElementName = scopy.isKeepSrcElement(); ocopy.ignoreMissingFromData = scopy.isIgnoreMissingFromData(); ocopy.ignoreUninitializedFromVariable = scopy.isIgnoreUninitializedFromVariable(); ocopy.insertMissingToData = scopy.isInsertMissingToData(); ocopy.insertMissingToData = scopy.isInsertMissingToData(); ocopy.debugInfo = new DebugInfo(_context.getSourceLocation(), scopy.getLineNo(), source.getExtensibilityElements()); try { if (scopy.getTo() == null) throw new CompilationException(__cmsgs.errMissingToSpec().setSource(scopy)); Object[] toResultType = new Object[1]; ocopy.to = compileTo(scopy.getTo(), toResultType); if (scopy.getFrom() == null) throw new CompilationException(__cmsgs.errMissingFromSpec().setSource(scopy)); ocopy.from = compileFrom(scopy.getFrom(), toResultType[0]); verifyCopy(ocopy); oassign.copy.add(ocopy); } catch (CompilationException ce) { _context.recoveredFromError(scopy, ce); } } } /** * Verify that a copy follows the correct form. * * @param ocopy */ private void verifyCopy(OAssign.Copy ocopy) { if (__log.isDebugEnabled()) __log.debug("verifying copy: " + ocopy); // If direct Message->Message copy if (ocopy.to instanceof OAssign.VariableRef && ((OAssign.VariableRef) ocopy.to).isMessageRef() && ocopy.from instanceof OAssign.VariableRef && ((OAssign.VariableRef) ocopy.from).isMessageRef()) { // Check that the LValue/RValue message types match up. String lvar = ((OAssign.VariableRef) ocopy.to).variable.name; String rvar = ((OAssign.VariableRef) ocopy.from).variable.name; QName tlvalue = ((OMessageVarType) ((OAssign.VariableRef) ocopy.to).variable.type).messageType; QName trvalue = ((OMessageVarType) ((OAssign.VariableRef) ocopy.from).variable.type).messageType; if (!tlvalue.equals(trvalue)) throw new CompilationException( __cmsgs.errMismatchedMessageAssignment(lvar, tlvalue, rvar, trvalue)); } // If Message->Non-Message copy else if (ocopy.from instanceof OAssign.VariableRef && ((OAssign.VariableRef) ocopy.from).isMessageRef() && (!(ocopy.to instanceof OAssign.VariableRef) || !((OAssign.VariableRef) ocopy.to).isMessageRef())) { String rval = ((OAssign.VariableRef) ocopy.from).variable.name; throw new CompilationException(__cmsgs.errCopyFromMessageToNonMessage(rval)); } // If Non-Message->Message copy else if (ocopy.to instanceof OAssign.VariableRef && ((OAssign.VariableRef) ocopy.to).isMessageRef() && (!(ocopy.from instanceof OAssign.VariableRef) || !((OAssign.VariableRef) ocopy.from).isMessageRef())) { String lval = ((OAssign.VariableRef) ocopy.to).variable.name; throw new CompilationException(__cmsgs.errCopyToMessageFromNonMessage(lval)); } // If *->Partner Link copy else if (ocopy.to instanceof OAssign.PartnerLinkRef && !((OAssign.PartnerLinkRef) ocopy.to).partnerLink.hasPartnerRole()) { String lval = ((OAssign.PartnerLinkRef) ocopy.to).partnerLink.getName(); throw new CompilationException(__cmsgs.errCopyToUndeclaredPartnerRole(lval)); } // If Partner Link->* copy else if (ocopy.from instanceof OAssign.PartnerLinkRef) { if (((OAssign.PartnerLinkRef) ocopy.from).isMyEndpointReference && !((OAssign.PartnerLinkRef) ocopy.from).partnerLink.hasMyRole()) { String lval = ((OAssign.PartnerLinkRef) ocopy.from).partnerLink.getName(); throw new CompilationException(__cmsgs.errCopyFromUndeclaredPartnerRole(lval, "myRole")); } if (!((OAssign.PartnerLinkRef) ocopy.from).isMyEndpointReference && !((OAssign.PartnerLinkRef) ocopy.from).partnerLink.hasPartnerRole()) { String lval = ((OAssign.PartnerLinkRef) ocopy.from).partnerLink.getName(); throw new CompilationException(__cmsgs.errCopyFromUndeclaredPartnerRole(lval, "partnerRole")); } } __log.debug("Copy verified OK: " + ocopy); } private OAssign.RValue compileFrom(From from, Object requestedResultType) { assert from != null; try { if (from.isExtensionVal()) { return compileExtensionVal(from.getAsExtensionVal()); } else if (from.isLiteralVal()) { return compileLiteral(from.getAsLiteralVal()); } else if (from.isPropertyVal()) { OAssign.PropertyRef pref = new OAssign.PropertyRef(_context.getOProcess()); PropertyVal pval = from.getAsPropertyVal(); pref.variable = _context.resolveVariable(pval.getVariable()); pref.propertyAlias = _context.resolvePropertyAlias(pref.variable, pval.getProperty()); return pref; } else if (from.isVariableVal()) { VariableVal vv = from.getAsVariableVal(); OAssign.VariableRef vref = new OAssign.VariableRef(_context.getOProcess()); vref.variable = _context.resolveVariable(vv.getVariable()); OVarType rootNodeType = vref.variable.type; if (vv.getPart() != null) { vref.part = _context.resolvePart(vref.variable, vv.getPart()); rootNodeType = vref.part.type; } if (vv.getHeader() != null) { vref.headerPart = _context.resolveHeaderPart(vref.variable, vv.getHeader()); if (vref.headerPart == null) vref.headerPart = new OMessageVarType.Part(_context.getOProcess(), vv.getHeader(), null); rootNodeType = vref.headerPart.type; } if (vv.getLocation() != null && vv.getLocation().getExpression() != null) vref.location = _context.compileExpr(vv.getLocation(), rootNodeType, requestedResultType, new Object[1]); return vref; } else if (from.isPartnerLinkVal()) { PartnerLinkVal plv = from.getAsPartnerLinkVal(); OAssign.PartnerLinkRef plref = new OAssign.PartnerLinkRef(_context.getOProcess()); plref.partnerLink = _context.resolvePartnerLink(plv.getPartnerLink()); plref.isMyEndpointReference = (plv .getEndpointReference() == PartnerLinkVal.EndpointReference.MYROLE); return plref; } else if (from.getAsExpression() != null) { return new OAssign.Expression(_context.getOProcess(), _context.compileExpr(from.getAsExpression(), null, requestedResultType, new Object[1])); } throw new CompilationException(__cmsgs.errUnkownFromSpec().setSource(from)); } catch (CompilationException ce) { if (ce.getCompilationMessage().source == null) ce.getCompilationMessage().source = from; throw ce; } } /** * Compile an extension to/from-spec. Extension to/from-specs are compiled into * "DirectRef"s. * * @param extVal source representation * @return compiled representation */ private RValue compileExtensionVal(ExtensionVal extVal) { OAssign.DirectRef dref = new OAssign.DirectRef(_context.getOProcess()); dref.variable = _context.resolveVariable(extVal.getVariable()); dref.elName = extVal.getExtension(); return dref; } private OAssign.RValue compileLiteral(LiteralVal from) { Element literal = from.getLiteral(); Document newDoc = DOMUtils.newDocument(); Element clone = (Element) newDoc.importNode(literal, true); newDoc.appendChild(clone); return new OAssign.Literal(_context.getOProcess(), newDoc); } private OAssign.LValue compileTo(To to, Object[] resultType) { assert to != null; try { if (to.isPropertyVal()) { OAssign.PropertyRef pref = new OAssign.PropertyRef(_context.getOProcess()); pref.variable = _context.resolveVariable(to.getAsPropertyVal().getVariable()); pref.propertyAlias = _context.resolvePropertyAlias(pref.variable, to.getAsPropertyVal().getProperty()); return pref; } else if (to.isVariableVal()) { VariableVal vv = to.getAsVariableVal(); OAssign.VariableRef vref = new OAssign.VariableRef(_context.getOProcess()); vref.variable = _context.resolveVariable(vv.getVariable()); OVarType rootNodeType = vref.variable.type; if (to.getAsVariableVal().getPart() != null) { vref.part = _context.resolvePart(vref.variable, vv.getPart()); rootNodeType = vref.part.type; } if (to.getAsVariableVal().getHeader() != null) { vref.headerPart = _context.resolveHeaderPart(vref.variable, vv.getHeader()); if (vref.headerPart == null) vref.headerPart = new OMessageVarType.Part(_context.getOProcess(), to.getAsVariableVal().getHeader(), null); rootNodeType = vref.headerPart.type; } resultType[0] = rootNodeType; if (vv.getLocation() != null && vv.getLocation().getExpression() != null) vref.location = _context.compileExpr(vv.getLocation(), rootNodeType, null, resultType); return vref; } else if (to.isPartnerLinkVal()) { OAssign.PartnerLinkRef plref = new OAssign.PartnerLinkRef(_context.getOProcess()); plref.partnerLink = _context.resolvePartnerLink(to.getAsPartnerLinkVal().getPartnerLink()); return plref; } else if (to.getAsExpression() != null) { return new OAssign.LValueExpression(_context.getOProcess(), _context.compileLValueExpr(to.getAsExpression(), null, null, resultType)); } throw new CompilationException(__cmsgs.errUnknownToSpec().setSource(to)); } catch (CompilationException ce) { if (ce.getCompilationMessage().source == null) ce.getCompilationMessage().source = to; throw ce; } } }