yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/ordered_by/OrderedByStatementSupport.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.yang.parser.rfc7950.stmt.ordered_by;
   9
  10 import com.google.common.collect.ImmutableList;
  11 import org.eclipse.jdt.annotation.NonNull;
  12 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  13 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  14 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  15 import org.opendaylight.yangtools.yang.model.api.stmt.OrderedByEffectiveStatement;
  16 import org.opendaylight.yangtools.yang.model.api.stmt.OrderedByStatement;
  17 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.BaseStringStatementSupport;
  18 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  19 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  20
  21 public final class OrderedByStatementSupport
  22         extends BaseStringStatementSupport<OrderedByStatement, OrderedByEffectiveStatement> {
  23     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR =
  24             SubstatementValidator.builder(YangStmtMapping.ORDERED_BY).build();
  25     private static final OrderedByStatementSupport INSTANCE = new OrderedByStatementSupport();
  26
  27     /*
  28      * Ordered-by has low argument cardinality, hence we can reuse them in case declaration does not have any
  29      * substatements (which is the usual case).
  30      */
  31     private static final @NonNull EmptyOrderedByStatement EMPTY_SYSTEM_DECL = new EmptyOrderedByStatement("system");
  32     private static final @NonNull EmptyOrderedByStatement EMPTY_USER_DECL = new EmptyOrderedByStatement("user");
  33
  34     private OrderedByStatementSupport() {
  35         super(YangStmtMapping.ORDERED_BY);
  36     }
  37
  38     public static OrderedByStatementSupport getInstance() {
  39         return INSTANCE;
  40     }
  41
  42     @Override
  43     public String parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  44         return value;
  45     }
  46
  47     @Override
  48     public String internArgument(final String rawArgument) {
  49         if ("user".equals(rawArgument)) {
  50             return "user";
  51         } else if ("system".equals(rawArgument)) {
  52             return "system";
  53         } else {
  54             return rawArgument;
  55         }
  56     }
  57
  58     @Override
  59     protected SubstatementValidator getSubstatementValidator() {
  60         return SUBSTATEMENT_VALIDATOR;
  61     }
  62
  63     @Override
  64     protected OrderedByStatement createDeclared(final StmtContext<String, OrderedByStatement, ?> ctx,
  65             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  66         return new RegularOrderedByStatement(ctx.coerceStatementArgument(), substatements);
  67     }
  68
  69     @Override
  70     protected OrderedByStatement createEmptyDeclared(final StmtContext<String, OrderedByStatement, ?> ctx) {
  71         final String argument = ctx.coerceStatementArgument();
  72         switch (argument) {
  73             case "system":
  74                 return EMPTY_SYSTEM_DECL;
  75             case "user":
  76                 return EMPTY_USER_DECL;
  77             default:
  78                 throw new IllegalStateException("Unhandled argument " + argument);
  79         }
  80     }
  81
  82     @Override
  83     protected OrderedByEffectiveStatement createEffective(
  84             final StmtContext<String, OrderedByStatement, OrderedByEffectiveStatement> ctx,
  85             final OrderedByStatement declared,
  86             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
  87         return new RegularOrderedByEffectiveStatement(declared, substatements);
  88     }
  89
  90     @Override
  91     protected OrderedByEffectiveStatement createEmptyEffective(
  92             final StmtContext<String, OrderedByStatement, OrderedByEffectiveStatement> ctx,
  93             final OrderedByStatement declared) {
  94         return new EmptyOrderedByEffectiveStatement(declared);
  95     }
  96 }