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| 1 | +/* |
| 2 | + * SPDX-FileCopyrightText: none |
| 3 | + * SPDX-License-Identifier: CC0-1.0 |
| 4 | + */ |
| 5 | + |
| 6 | +package gov.nist.secauto.metaschema.core.metapath.item; |
| 7 | + |
| 8 | +import gov.nist.secauto.metaschema.core.metapath.ICollectionValue; |
| 9 | +import gov.nist.secauto.metaschema.core.metapath.ISequence; |
| 10 | +import gov.nist.secauto.metaschema.core.metapath.item.atomic.IAnyAtomicItem; |
| 11 | +import gov.nist.secauto.metaschema.core.metapath.item.function.IArrayItem; |
| 12 | +import gov.nist.secauto.metaschema.core.metapath.item.function.IMapItem; |
| 13 | +import gov.nist.secauto.metaschema.core.metapath.item.node.INodeItem; |
| 14 | + |
| 15 | +import java.io.PrintWriter; |
| 16 | + |
| 17 | +import edu.umd.cs.findbugs.annotations.NonNull; |
| 18 | + |
| 19 | +/** |
| 20 | + * Produces a textual representation of a Metapath sequence. |
| 21 | + */ |
| 22 | +public class DefaultItemWriter implements IItemWriter { |
| 23 | + |
| 24 | + @NonNull |
| 25 | + private final PrintWriter writer; |
| 26 | + @NonNull |
| 27 | + private final Visitor visitor = new Visitor(); |
| 28 | + |
| 29 | + /** |
| 30 | + * Construct a new item writer. |
| 31 | + * |
| 32 | + * @param writer |
| 33 | + * the writer to append text to |
| 34 | + */ |
| 35 | + public DefaultItemWriter(@NonNull PrintWriter writer) { |
| 36 | + this.writer = writer; |
| 37 | + } |
| 38 | + |
| 39 | + @Override |
| 40 | + public void writeSequence(ISequence<?> sequence) { |
| 41 | + boolean wrap = sequence.size() != 1; |
| 42 | + if (wrap) { |
| 43 | + writer.append('('); |
| 44 | + } |
| 45 | + boolean first = true; |
| 46 | + for (IItem item : sequence) { |
| 47 | + |
| 48 | + if (first) { |
| 49 | + first = false; |
| 50 | + } else { |
| 51 | + writer.append(','); |
| 52 | + } |
| 53 | + |
| 54 | + item.accept(visitor); |
| 55 | + } |
| 56 | + |
| 57 | + if (wrap) { |
| 58 | + writer.append(')'); |
| 59 | + } |
| 60 | + } |
| 61 | + |
| 62 | + @Override |
| 63 | + public void writeArray(IArrayItem<?> array) { |
| 64 | + writer.append('['); |
| 65 | + boolean first = true; |
| 66 | + for (ICollectionValue value : array) { |
| 67 | + assert value != null; |
| 68 | + |
| 69 | + if (first) { |
| 70 | + first = false; |
| 71 | + } else { |
| 72 | + writer.append(','); |
| 73 | + } |
| 74 | + |
| 75 | + writeCollectionValue(value); |
| 76 | + } |
| 77 | + writer.append(']'); |
| 78 | + } |
| 79 | + |
| 80 | + @Override |
| 81 | + public void writeMap(IMapItem<?> map) { |
| 82 | + writer.append("map {"); |
| 83 | + boolean first = true; |
| 84 | + for (ICollectionValue value : map.values()) { |
| 85 | + assert value != null; |
| 86 | + |
| 87 | + if (first) { |
| 88 | + first = false; |
| 89 | + } else { |
| 90 | + writer.append(','); |
| 91 | + } |
| 92 | + |
| 93 | + writeCollectionValue(value); |
| 94 | + } |
| 95 | + writer.append('}'); |
| 96 | + } |
| 97 | + |
| 98 | + @Override |
| 99 | + public void writeNode(INodeItem node) { |
| 100 | + writer.append(node.getBaseUri().toString()); |
| 101 | + writer.append('#'); |
| 102 | + writer.append(node.getMetapath()); |
| 103 | + } |
| 104 | + |
| 105 | + @Override |
| 106 | + public void writeAtomicValue(IAnyAtomicItem node) { |
| 107 | + writer.append(node.asString()); |
| 108 | + } |
| 109 | + |
| 110 | + /** |
| 111 | + * Write the provided collection value. |
| 112 | + * |
| 113 | + * @param value |
| 114 | + * the value to write |
| 115 | + */ |
| 116 | + protected void writeCollectionValue(@NonNull ICollectionValue value) { |
| 117 | + if (value instanceof IItem) { |
| 118 | + ((IItem) value).accept(visitor); |
| 119 | + } else if (value instanceof ISequence) { |
| 120 | + writeSequence((ISequence<?>) value); |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + private final class Visitor implements IItemVisitor { |
| 125 | + |
| 126 | + @Override |
| 127 | + public void visit(IArrayItem<?> array) { |
| 128 | + writeArray(array); |
| 129 | + } |
| 130 | + |
| 131 | + @Override |
| 132 | + public void visit(IMapItem<?> map) { |
| 133 | + writeMap(map); |
| 134 | + } |
| 135 | + |
| 136 | + @Override |
| 137 | + public void visit(INodeItem node) { |
| 138 | + writeNode(node); |
| 139 | + } |
| 140 | + |
| 141 | + @Override |
| 142 | + public void visit(IAnyAtomicItem node) { |
| 143 | + writeAtomicValue(node); |
| 144 | + } |
| 145 | + } |
| 146 | +} |
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