binding2/mdsal-binding2-java-api-generator/src/main/java/org/opendaylight/mdsal/binding/javav2/java/api/generator/range_generators/LengthGenerator.java

   1 /*
   2  * Copyright (c) 2017 Cisco Systems, Inc. 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.mdsal.binding.javav2.java.api.generator.range_generators;
   9
  10 import com.google.common.collect.Range;
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.Set;
  14 import javax.annotation.Nonnull;
  15 import javax.annotation.Nullable;
  16 import org.opendaylight.mdsal.binding.javav2.model.api.Type;
  17 import org.opendaylight.yangtools.yang.model.api.type.LengthConstraint;
  18
  19 public final class LengthGenerator {
  20     private LengthGenerator() {
  21         throw new UnsupportedOperationException();
  22     }
  23
  24     private static String lengthCheckerName(final String member) {
  25         return "check" + member + "Length";
  26     }
  27
  28     private static Collection<String> createExpressions(final LengthConstraint constraint) {
  29         final Set<Range<Integer>> constraints = constraint.getAllowedRanges().asRanges();
  30         final Collection<String> ret = new ArrayList<>(constraints.size());
  31
  32         for (Range<Integer> l : constraints) {
  33             final StringBuilder sb = new StringBuilder("length >");
  34
  35             // We have to deal with restrictions being out of integer's range
  36             if (l.lowerEndpoint() <= Integer.MAX_VALUE) {
  37                 sb.append('=');
  38             }
  39             sb.append(' ').append(l.lowerEndpoint());
  40
  41             final int max = l.upperEndpoint();
  42             if (max < Integer.MAX_VALUE) {
  43                 sb.append(" && length <= ").append(max);
  44             }
  45
  46             ret.add(sb.toString());
  47         }
  48
  49         return ret;
  50     }
  51
  52     private static String createLengthString(final LengthConstraint constraint) {
  53         return new ArrayList<>(constraint.getAllowedRanges().asRanges()).toString();
  54     }
  55
  56     private static String generateArrayLengthChecker(final String member, final LengthConstraint constraint) {
  57         final StringBuilder sb = new StringBuilder();
  58         final Collection<String> expressions = createExpressions(constraint);
  59
  60         sb.append("private static void ").append(lengthCheckerName(member)).append("(final byte[] value) {\n");
  61
  62         if (!expressions.isEmpty()) {
  63             sb.append("    final int length = value.length;\n");
  64
  65             for (String exp : expressions) {
  66                 sb.append("    if (").append(exp).append(") {\n");
  67                 sb.append("        return;\n");
  68                 sb.append("    }\n");
  69             }
  70
  71             sb.append("    throw new IllegalArgumentException(String.format(\"Invalid length: %s, expected: ")
  72               .append(createLengthString(constraint)).append(".\", java.util.Arrays.toString(value)));\n");
  73         }
  74
  75         sb.append("}\n");
  76
  77         return sb.toString();
  78     }
  79
  80     private static String generateStringLengthChecker(final String member, final LengthConstraint constraint) {
  81         final StringBuilder sb = new StringBuilder();
  82         final Collection<String> expressions = createExpressions(constraint);
  83
  84         sb.append("private static void ").append(lengthCheckerName(member)).append("(final String value) {\n");
  85
  86         if (!expressions.isEmpty()) {
  87             sb.append("    final int length = value.length();\n");
  88
  89             for (String exp : expressions) {
  90                 sb.append("    if (").append(exp).append(") {\n");
  91                 sb.append("        return;\n");
  92                 sb.append("    }\n");
  93             }
  94
  95             sb.append("    throw new IllegalArgumentException(String.format(\"Invalid length: %s, expected: ")
  96               .append(createLengthString(constraint)).append(".\", value));\n");
  97         }
  98
  99         sb.append("}\n");
 100
 101         return sb.toString();
 102     }
 103
 104     public static String generateLengthChecker(final String member, final Type type,
 105             final LengthConstraint constraint) {
 106         if (TypeUtils.getBaseYangType(type).getName().contains("[")) {
 107             return generateArrayLengthChecker(member, constraint);
 108         } else {
 109             return generateStringLengthChecker(member, constraint);
 110         }
 111     }
 112
 113     public static String generateLengthCheckerCall(@Nullable final String member,
 114             @Nonnull final String valueReference) {
 115         return lengthCheckerName(member) + '(' + valueReference + ");\n";
 116     }
 117 }