sli/provider/src/main/java/org/onap/ccsdk/sli/core/sli/provider/SetNodeExecutor.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP : CCSDK
   4  * ================================================================================
   5  * Copyright (C) 2017 ONAP
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.ccsdk.sli.core.sli.provider;
  22
  23 import java.util.HashMap;
  24 import java.util.Iterator;
  25 import java.util.LinkedList;
  26 import java.util.Map;
  27 import java.util.Set;
  28
  29 import org.onap.ccsdk.sli.core.sli.SvcLogicContext;
  30 import org.onap.ccsdk.sli.core.sli.SvcLogicException;
  31 import org.onap.ccsdk.sli.core.sli.SvcLogicExpression;
  32 import org.onap.ccsdk.sli.core.sli.SvcLogicExpressionFactory;
  33 import org.onap.ccsdk.sli.core.sli.SvcLogicNode;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 public class SetNodeExecutor extends SvcLogicNodeExecutor {
  38
  39         private static final Logger LOG = LoggerFactory
  40                         .getLogger(SetNodeExecutor.class);
  41
  42         @Override
  43         public SvcLogicNode execute(SvcLogicServiceImpl svc, SvcLogicNode node,
  44                         SvcLogicContext ctx) throws SvcLogicException {
  45
  46                 String ifunsetStr = SvcLogicExpressionResolver.evaluate(
  47                                 node.getAttribute("only-if-unset"), node, ctx);
  48
  49                 boolean ifunset = "true".equalsIgnoreCase(ifunsetStr);
  50
  51                 Set<Map.Entry<String, SvcLogicExpression>> parameterSet = node
  52                                 .getParameterSet();
  53
  54                 for (Iterator<Map.Entry<String, SvcLogicExpression>> iter = parameterSet
  55                                 .iterator(); iter.hasNext();) {
  56                         Map.Entry<String, SvcLogicExpression> curEnt = iter.next();
  57                         String curName = curEnt.getKey();
  58                         String lhsVarName = curName;
  59
  60                         // Resolve LHS of assignment (could contain index variables)
  61                         try {
  62                                 SvcLogicExpression lhsExpr = SvcLogicExpressionFactory.parse(curName);
  63                                 lhsVarName = SvcLogicExpressionResolver.resolveVariableName(lhsExpr, node, ctx);
  64                         } catch (Exception e) {
  65                                 LOG.warn("Caught exception trying to resolve variable name ("+curName+")", e);
  66                         }
  67
  68
  69                         boolean setValue = true;
  70
  71                         if (curName.endsWith(".")) {
  72
  73                                 // Copy subtree - value should be a variable name
  74                                 SvcLogicExpression curValue = curEnt.getValue();
  75
  76                                 if (curValue != null) {
  77                                         String rhsRoot = curValue.toString();
  78
  79                                         if ((rhsRoot != null) && (rhsRoot.length() > 0)) {
  80                                                 if (rhsRoot.endsWith(".")) {
  81                                                         rhsRoot = rhsRoot
  82                                                                         .substring(0, rhsRoot.length() - 1);
  83                                                 }
  84
  85
  86                                                 // SDNGC-2321 : rhsRoot is variable name, possibly with subscript(s) to be resolved
  87                                                 try {
  88                                                         SvcLogicExpression rhsExpr = SvcLogicExpressionFactory.parse(rhsRoot);
  89                                                         rhsRoot = SvcLogicExpressionResolver.resolveVariableName(rhsExpr, node, ctx);
  90                                                 } catch (Exception e) {
  91                                                         LOG.warn("Caught exception trying to resolve variable name ("+rhsRoot+")", e);
  92                                                 }
  93
  94                                                 // See if the parameters are reversed (copying service-data to input) .. this
  95                                                 // was done as a workaround to earlier issue
  96                                                 if (curName.endsWith("-input.") && rhsRoot.startsWith("service-data")) {
  97                                                         LOG.warn("Arguments appear to be reversed .. will copy input to service-data instead");
  98                                                         lhsVarName = rhsRoot + ".";
  99                                                         rhsRoot = curName.substring(0, curName.length()-1);
 100                                                 }
 101
 102                                                 rhsRoot = rhsRoot + ".";
 103                                                 String lhsPrefix = lhsVarName;
 104
 105                                                 if (lhsPrefix.endsWith(".")) {
 106                                                         lhsPrefix = lhsPrefix.substring(0,
 107                                                                 lhsPrefix.length()-1);
 108                                                 }
 109                                                 int lhsPfxLength = lhsPrefix.length();
 110                                                 HashMap<String, String> parmsToAdd = new HashMap<String,String>();
 111
 112                                                 for (String sourceVarName : ctx.getAttributeKeySet()) {
 113
 114                                                         if (sourceVarName.startsWith(rhsRoot)) {
 115
 116                                                                 String targetVar = lhsPrefix
 117                                                                                 + "."
 118                                                                                 + sourceVarName
 119                                                                                                 .substring(rhsRoot.length());
 120
 121                                                                 LOG.debug("Copying " + sourceVarName
 122                                                                                 + " value to " + targetVar);
 123
 124                                                                 parmsToAdd.put(targetVar,
 125                                                                                 ctx.getAttribute(sourceVarName));
 126                                                         }
 127                                                 }
 128
 129                                                 for (String newParmName : parmsToAdd.keySet()) {
 130                                                         ctx.setAttribute(newParmName, parmsToAdd.get(newParmName));
 131                                                 }
 132
 133                                         } else {
 134                                                 // If RHS is empty, unset attributes in LHS
 135                                                 String lhsPrefix = lhsVarName.substring(0,
 136                                                                 lhsVarName.length() - 1);
 137                                                 int lhsPfxLength = lhsPrefix.length();
 138
 139                                                 LinkedList<String> parmsToRemove = new LinkedList<String> ();
 140
 141                                                 for (String curCtxVarname : ctx.getAttributeKeySet()) {
 142
 143                                                         if (curCtxVarname.startsWith(lhsPrefix)) {
 144                                                                 LOG.debug("Unsetting " + curCtxVarname);
 145                                                                 parmsToRemove.add(curCtxVarname);
 146                                                         }
 147                                                 }
 148
 149                                                 for (String parmName : parmsToRemove) {
 150                                                         ctx.setAttribute(parmName, null);
 151                                                 }
 152
 153                                         }
 154                                 }
 155
 156                         } else {
 157
 158                                 if (ifunset) {
 159                                         String ctxValue = ctx.getAttribute(lhsVarName);
 160
 161                                         if ((ctxValue != null) && (ctxValue.length() > 0)) {
 162                                                 setValue = false;
 163                                                 LOG.debug("Attribute "
 164                                                                 + lhsVarName
 165                                                                 + " already set and only-if-unset is true, so not overriding");
 166                                         }
 167                                 }
 168
 169                                 if (setValue) {
 170                                         String curValue = SvcLogicExpressionResolver.evaluate(
 171                                                         curEnt.getValue(), node, ctx);
 172
 173                                         if (LOG.isDebugEnabled()) {
 174                                                 LOG.trace("Parameter value "
 175                                                                 + curEnt.getValue().asParsedExpr()
 176                                                                 + " resolves to " + curValue);
 177                                                 LOG.debug("Setting context attribute " + lhsVarName
 178                                                                 + " to " + curValue);
 179                                         }
 180                                         ctx.setAttribute(lhsVarName, curValue);
 181                                 }
 182                         }
 183                 }
 184
 185                 return null;
 186         }
 187
 188 }