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.InferenceException;
  26 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  27 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  28 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  29
  30 public final class LengthStatementSupport
  31         extends BaseStatementSupport<List<ValueRange>, LengthStatement, LengthEffectiveStatement> {
  32     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  33         .LENGTH)
  34         .addOptional(YangStmtMapping.DESCRIPTION)
  35         .addOptional(YangStmtMapping.ERROR_APP_TAG)
  36         .addOptional(YangStmtMapping.ERROR_MESSAGE)
  37         .addOptional(YangStmtMapping.REFERENCE)
  38         .build();
  39     private static final LengthStatementSupport INSTANCE = new LengthStatementSupport();
  40
  41     private LengthStatementSupport() {
  42         super(YangStmtMapping.LENGTH, CopyPolicy.CONTEXT_INDEPENDENT);
  43     }
  44
  45     public static LengthStatementSupport getInstance() {
  46         return INSTANCE;
  47     }
  48
  49     @Override
  50     public ImmutableList<ValueRange> parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  51         final List<ValueRange> ranges = new ArrayList<>();
  52
  53         for (final String singleRange : ArgumentUtils.PIPE_SPLITTER.split(value)) {
  54             final Iterator<String> boundaries = ArgumentUtils.TWO_DOTS_SPLITTER.split(singleRange).iterator();
  55             final Number min = parseIntegerConstraintValue(ctx, boundaries.next());
  56
  57             final Number max;
  58             if (boundaries.hasNext()) {
  59                 max = parseIntegerConstraintValue(ctx, boundaries.next());
  60
  61                 // if min larger than max then error
  62                 SourceException.throwIf(ArgumentUtils.compareNumbers(min, max) == 1, ctx.getStatementSourceReference(),
  63                         "Length constraint %s has descending order of boundaries; should be ascending.", singleRange);
  64                 SourceException.throwIf(boundaries.hasNext(), ctx.getStatementSourceReference(),
  65                         "Wrong number of boundaries in length constraint %s.", singleRange);
  66             } else {
  67                 max = min;
  68             }
  69
  70             // some of intervals overlapping
  71             InferenceException.throwIf(ranges.size() > 1
  72                 && ArgumentUtils.compareNumbers(min, Iterables.getLast(ranges).upperBound()) != 1,
  73                         ctx.getStatementSourceReference(),  "Some of the length ranges in %s are not disjoint", value);
  74             ranges.add(ValueRange.of(min, max));
  75         }
  76
  77         return ImmutableList.copyOf(ranges);
  78     }
  79
  80     @Override
  81     protected SubstatementValidator getSubstatementValidator() {
  82         return SUBSTATEMENT_VALIDATOR;
  83     }
  84
  85     @Override
  86     protected LengthStatement createDeclared(final StmtContext<List<ValueRange>, LengthStatement, ?> ctx,
  87             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  88         return new RegularLengthStatement(ctx, substatements);
  89     }
  90
  91     @Override
  92     protected LengthStatement createEmptyDeclared(final StmtContext<List<ValueRange>, LengthStatement, ?> ctx) {
  93         return new EmptyLengthStatement(ctx);
  94     }
  95
  96     @Override
  97     protected LengthEffectiveStatement createEffective(
  98             final StmtContext<List<ValueRange>, LengthStatement, LengthEffectiveStatement> ctx,
  99             final LengthStatement declared, final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 100         return new RegularLengthEffectiveStatement(declared, substatements);
 101     }
 102
 103     @Override
 104     protected LengthEffectiveStatement createEmptyEffective(
 105             final StmtContext<List<ValueRange>, LengthStatement, LengthEffectiveStatement> ctx,
 106             final LengthStatement declared) {
 107         return new EmptyLengthEffectiveStatement(declared);
 108     }
 109
 110     private static Number parseIntegerConstraintValue(final StmtContext<?, ?, ?> ctx, final String value) {
 111         if ("max".equals(value)) {
 112             return UnresolvedNumber.max();
 113         }
 114         if ("min".equals(value)) {
 115             return UnresolvedNumber.min();
 116         }
 117
 118         try {
 119             return new BigInteger(value);
 120         } catch (final NumberFormatException e) {
 121             throw new SourceException(ctx.getStatementSourceReference(), e, "Value %s is not a valid integer", value);
 122         }
 123     }
 124 }