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| 1 | +/*- |
| 2 | + * Copyright (c) 2018 Red Hat, Inc. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package org.fedoraproject.xmvn.tools.resolve.xml; |
| 17 | + |
| 18 | +import java.io.IOException; |
| 19 | +import java.nio.file.Path; |
| 20 | +import java.nio.file.Paths; |
| 21 | + |
| 22 | +import javax.xml.stream.XMLEventReader; |
| 23 | +import javax.xml.stream.XMLStreamConstants; |
| 24 | +import javax.xml.stream.XMLStreamException; |
| 25 | +import javax.xml.stream.events.StartElement; |
| 26 | +import javax.xml.stream.events.XMLEvent; |
| 27 | + |
| 28 | +import org.fedoraproject.xmvn.artifact.Artifact; |
| 29 | + |
| 30 | +/** |
| 31 | + * @author Marian Koncek |
| 32 | + */ |
| 33 | +class ArtifactUnmarshaller |
| 34 | +{ |
| 35 | + private XMLEventReader eventReader; |
| 36 | + |
| 37 | + static class StringConstants |
| 38 | + { |
| 39 | + private static final String GROUP_ID = "groupId"; |
| 40 | + |
| 41 | + private static final String ARTIFACT_ID = "artifactId"; |
| 42 | + |
| 43 | + private static final String EXTENSION = "extension"; |
| 44 | + |
| 45 | + private static final String CLASSIFIER = "classifier"; |
| 46 | + |
| 47 | + private static final String VERSION = "version"; |
| 48 | + |
| 49 | + private static final String PATH = "path"; |
| 50 | + } |
| 51 | + |
| 52 | + public ArtifactUnmarshaller( XMLEventReader eventReader ) |
| 53 | + { |
| 54 | + this.eventReader = eventReader; |
| 55 | + } |
| 56 | + |
| 57 | + /** |
| 58 | + * @return A String representation of the nested element or an empty string if end of section has been found |
| 59 | + * @throws IOException |
| 60 | + * @throws XMLStreamException |
| 61 | + */ |
| 62 | + String readUntilEnd( String end ) |
| 63 | + throws XMLStreamException |
| 64 | + { |
| 65 | + StringBuffer stringBuffer = new StringBuffer(); |
| 66 | + |
| 67 | + while ( eventReader.hasNext() ) |
| 68 | + { |
| 69 | + XMLEvent event = eventReader.nextEvent(); |
| 70 | + |
| 71 | + if ( event.getEventType() == XMLStreamConstants.CHARACTERS ) |
| 72 | + { |
| 73 | + stringBuffer.append( event.asCharacters().getData() ); |
| 74 | + } |
| 75 | + else if ( event.getEventType() == XMLStreamConstants.END_ELEMENT |
| 76 | + && event.asEndElement().getName().getLocalPart().equals( end ) ) |
| 77 | + { |
| 78 | + return stringBuffer.toString(); |
| 79 | + } |
| 80 | + } |
| 81 | + |
| 82 | + throw new XMLStreamException( "XML stream does not have a proper format" ); |
| 83 | + } |
| 84 | + |
| 85 | + Artifact unmarshal() |
| 86 | + throws XMLStreamException |
| 87 | + { |
| 88 | + ArtifactBean artifactBean = new ArtifactBean(); |
| 89 | + Path path = null; |
| 90 | + |
| 91 | + while ( eventReader.hasNext() ) |
| 92 | + { |
| 93 | + XMLEvent event = eventReader.nextEvent(); |
| 94 | + |
| 95 | + switch ( event.getEventType() ) |
| 96 | + { |
| 97 | + case XMLStreamConstants.START_ELEMENT: |
| 98 | + StartElement startElement = event.asStartElement(); |
| 99 | + String startName = startElement.getName().getLocalPart(); |
| 100 | + |
| 101 | + switch ( startName ) |
| 102 | + { |
| 103 | + case StringConstants.GROUP_ID: |
| 104 | + artifactBean.setGroupId( readUntilEnd( StringConstants.GROUP_ID ) ); |
| 105 | + if ( artifactBean.getGroupId().isEmpty() ) |
| 106 | + { |
| 107 | + throw new XMLStreamException( "Xml read error: groupId must not be empty" ); |
| 108 | + } |
| 109 | + break; |
| 110 | + |
| 111 | + case StringConstants.ARTIFACT_ID: |
| 112 | + artifactBean.setArtifactId( readUntilEnd( StringConstants.ARTIFACT_ID ) ); |
| 113 | + if ( artifactBean.getArtifactId().isEmpty() ) |
| 114 | + { |
| 115 | + throw new XMLStreamException( "Xml read error: artifactId must not be empty" ); |
| 116 | + } |
| 117 | + break; |
| 118 | + |
| 119 | + case StringConstants.EXTENSION: |
| 120 | + artifactBean.setExtension( readUntilEnd( StringConstants.EXTENSION ) ); |
| 121 | + break; |
| 122 | + |
| 123 | + case StringConstants.CLASSIFIER: |
| 124 | + artifactBean.setClassifier( readUntilEnd( StringConstants.CLASSIFIER ) ); |
| 125 | + break; |
| 126 | + |
| 127 | + case StringConstants.VERSION: |
| 128 | + artifactBean.setVersion( readUntilEnd( StringConstants.VERSION ) ); |
| 129 | + break; |
| 130 | + |
| 131 | + case StringConstants.PATH: |
| 132 | + path = Paths.get( readUntilEnd( StringConstants.PATH ) ); |
| 133 | + break; |
| 134 | + |
| 135 | + default: |
| 136 | + continue; |
| 137 | + } |
| 138 | + break; |
| 139 | + |
| 140 | + case XMLStreamConstants.END_ELEMENT: |
| 141 | + if ( event.asEndElement().getName().getLocalPart().equals( "artifact" ) ) |
| 142 | + { |
| 143 | + try |
| 144 | + { |
| 145 | + return new ArtifactBean.Adapter().unmarshal( artifactBean ).setPath( path ); |
| 146 | + } |
| 147 | + catch ( Exception e ) |
| 148 | + { |
| 149 | + throw new XMLStreamException( "XML stream does not have a proper format", e ); |
| 150 | + } |
| 151 | + } |
| 152 | + break; |
| 153 | + |
| 154 | + default: |
| 155 | + continue; |
| 156 | + } |
| 157 | + } |
| 158 | + |
| 159 | + throw new XMLStreamException( "XML stream does not have a proper format" ); |
| 160 | + } |
| 161 | +} |
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