yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/length/LengthStatementSupport.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.length;
   9
  10 import com.google.common.collect.ImmutableList;
  11 import com.google.common.collect.Iterables;
  12 import java.math.BigInteger;
  13 import java.util.ArrayList;
  14 import java.util.Iterator;
  15 import java.util.List;
  16 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  17 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  18 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  19 import org.opendaylight.yangtools.yang.model.api.stmt.LengthEffectiveStatement;
  20 import org.opendaylight.yangtools.yang.model.api.stmt.LengthStatement;
  21 import org.opendaylight.yangtools.yang.model.api.stmt.UnresolvedNumber;
  22 import org.opendaylight.yangtools.yang.model.api.stmt.ValueRange;
  23 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.ArgumentUtils;
  24 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.BaseStatementSupport;
  25 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
  26 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
  27 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  28 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  29 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  30
  31 public final class LengthStatementSupport
  32         extends BaseStatementSupport<List<ValueRange>, LengthStatement, LengthEffectiveStatement> {
  33     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  34         .LENGTH)
  35         .addOptional(YangStmtMapping.DESCRIPTION)
  36         .addOptional(YangStmtMapping.ERROR_APP_TAG)
  37         .addOptional(YangStmtMapping.ERROR_MESSAGE)
  38         .addOptional(YangStmtMapping.REFERENCE)
  39         .build();
  40     private static final LengthStatementSupport INSTANCE = new LengthStatementSupport();
  41
  42     private LengthStatementSupport() {
  43         super(YangStmtMapping.LENGTH, CopyPolicy.CONTEXT_INDEPENDENT);
  44     }
  45
  46     public static LengthStatementSupport getInstance() {
  47         return INSTANCE;
  48     }
  49
  50     @Override
  51     public ImmutableList<ValueRange> parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  52         final List<ValueRange> ranges = new ArrayList<>();
  53
  54         for (final String singleRange : ArgumentUtils.PIPE_SPLITTER.split(value)) {
  55             final Iterator<String> boundaries = ArgumentUtils.TWO_DOTS_SPLITTER.split(singleRange).iterator();
  56             final Number min = parseIntegerConstraintValue(ctx, boundaries.next());
  57
  58             final Number max;
  59             if (boundaries.hasNext()) {
  60                 max = parseIntegerConstraintValue(ctx, boundaries.next());
  61
  62                 // if min larger than max then error
  63                 SourceException.throwIf(ArgumentUtils.compareNumbers(min, max) == 1, ctx.getStatementSourceReference(),
  64                         "Length constraint %s has descending order of boundaries; should be ascending.", singleRange);
  65                 SourceException.throwIf(boundaries.hasNext(), ctx.getStatementSourceReference(),
  66                         "Wrong number of boundaries in length constraint %s.", singleRange);
  67             } else {
  68                 max = min;
  69             }
  70
  71             // some of intervals overlapping
  72             InferenceException.throwIf(ranges.size() > 1
  73                 && ArgumentUtils.compareNumbers(min, Iterables.getLast(ranges).upperBound()) != 1,
  74                         ctx.getStatementSourceReference(),  "Some of the length ranges in %s are not disjoint", value);
  75             ranges.add(ValueRange.of(min, max));
  76         }
  77
  78         return ImmutableList.copyOf(ranges);
  79     }
  80
  81     @Override
  82     protected SubstatementValidator getSubstatementValidator() {
  83         return SUBSTATEMENT_VALIDATOR;
  84     }
  85
  86     @Override
  87     protected LengthStatement createDeclared(final StmtContext<List<ValueRange>, LengthStatement, ?> ctx,
  88             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  89         return new RegularLengthStatement(ctx.coerceRawStatementArgument(), ctx.coerceStatementArgument(),
  90             substatements);
  91     }
  92
  93     @Override
  94     protected LengthStatement createEmptyDeclared(final StmtContext<List<ValueRange>, LengthStatement, ?> ctx) {
  95         return new EmptyLengthStatement(ctx.coerceRawStatementArgument(), ctx.coerceStatementArgument());
  96     }
  97
  98     @Override
  99     protected LengthEffectiveStatement createEffective(final Current<List<ValueRange>, LengthStatement> stmt,
 100             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 101         return substatements.isEmpty() ? new EmptyLengthEffectiveStatement(stmt.declared())
 102             : new RegularLengthEffectiveStatement(stmt.declared(), substatements);
 103     }
 104
 105     private static Number parseIntegerConstraintValue(final StmtContext<?, ?, ?> ctx, final String value) {
 106         if ("max".equals(value)) {
 107             return UnresolvedNumber.max();
 108         }
 109         if ("min".equals(value)) {
 110             return UnresolvedNumber.min();
 111         }
 112
 113         try {
 114             return new BigInteger(value);
 115         } catch (final NumberFormatException e) {
 116             throw new SourceException(ctx.getStatementSourceReference(), e, "Value %s is not a valid integer", value);
 117         }
 118     }
 119 }