yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/rfc6020/YinStatementSourceImpl.java

   1 /*
   2  * Copyright (c) 2015 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
   9 package org.opendaylight.yangtools.yang.parser.stmt.rfc6020;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.io.ByteStreams;
  13 import java.io.BufferedInputStream;
  14 import java.io.ByteArrayInputStream;
  15 import java.io.File;
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18 import java.net.URISyntaxException;
  19 import javax.xml.stream.XMLInputFactory;
  20 import javax.xml.stream.XMLStreamException;
  21 import javax.xml.stream.XMLStreamReader;
  22 import org.opendaylight.yangtools.yang.parser.impl.YinStatementParserImpl;
  23 import org.opendaylight.yangtools.yang.parser.spi.source.PrefixToModule;
  24 import org.opendaylight.yangtools.yang.parser.spi.source.QNameToStatementDefinition;
  25 import org.opendaylight.yangtools.yang.parser.spi.source.StatementStreamSource;
  26 import org.opendaylight.yangtools.yang.parser.spi.source.StatementWriter;
  27 import org.opendaylight.yangtools.yang.parser.util.NamedFileInputStream;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  *
  33  * This class represents implementation of StatementStreamSource
  34  * in order to emit YIN statements using supplied StatementWriter
  35  *
  36  */
  37 public class YinStatementSourceImpl implements StatementStreamSource {
  38
  39     private static final Logger LOG = LoggerFactory.getLogger(YinStatementSourceImpl.class);
  40     private static XMLInputFactory xmlInputFactory = XMLInputFactory.newFactory();
  41
  42     private YinStatementParserImpl yinStatementModelParser;
  43     private XMLStreamReader streamReader;
  44     private InputStream inputStream;
  45     private String fileName;
  46     private boolean isAbsolute;
  47
  48     public YinStatementSourceImpl(final InputStream inputStream) {
  49         yinStatementModelParser = new YinStatementParserImpl(inputStream.toString());
  50         this.inputStream = new BufferedInputStream(inputStream);
  51         this.inputStream.mark(Integer.MAX_VALUE);
  52     }
  53
  54     public YinStatementSourceImpl(final String fileName, final boolean isAbsolute) {
  55         yinStatementModelParser = new YinStatementParserImpl(fileName);
  56         this.fileName = Preconditions.checkNotNull(fileName);
  57         this.isAbsolute = isAbsolute;
  58     }
  59
  60     @Override
  61     public void writeLinkage(StatementWriter writer, QNameToStatementDefinition stmtDef) {
  62         initializeReader();
  63         yinStatementModelParser.setAttributes(writer, stmtDef);
  64         yinStatementModelParser.walk(streamReader);
  65     }
  66
  67     @Override
  68     public void writeLinkageAndStatementDefinitions(StatementWriter writer, QNameToStatementDefinition stmtDef,
  69             PrefixToModule prefixes) {
  70         initializeReader();
  71         yinStatementModelParser.setAttributes(writer, stmtDef, prefixes);
  72         yinStatementModelParser.walk(streamReader);
  73     }
  74
  75     @Override
  76     public void writeFull(StatementWriter writer, QNameToStatementDefinition stmtDef, PrefixToModule prefixes) {
  77         initializeReader();
  78         yinStatementModelParser.setAttributes(writer, stmtDef, prefixes);
  79         yinStatementModelParser.walk(streamReader);
  80         closeReader();
  81     }
  82
  83     private void initializeReader() {
  84         try {
  85             if (fileName != null) {
  86                 inputStream = loadFile(fileName, isAbsolute);
  87                 streamReader = xmlInputFactory.createXMLStreamReader(inputStream);
  88             } else {
  89                 inputStream.reset();
  90                 streamReader = xmlInputFactory.createXMLStreamReader(new ByteArrayInputStream(ByteStreams.toByteArray
  91                         (inputStream)));
  92             }
  93         } catch (XMLStreamException e) {
  94             LOG.warn("Error while creating XMLStreamReader from input stream", e);
  95         } catch (URISyntaxException e) {
  96             LOG.warn("File name {} cannot be parsed as URI reference", fileName, e);
  97         } catch (IOException e) {
  98             LOG.warn("File {} cannot be found or read into string ", fileName, e);
  99         }
 100     }
 101
 102     private void closeReader() {
 103         try {
 104             inputStream.close();
 105             streamReader.close();
 106         } catch (XMLStreamException e) {
 107             LOG.warn("Error occured while freeing associated resources", e);
 108         } catch (IOException e) {
 109             LOG.warn("I/O error occured during closing the input stream", e);
 110         }
 111     }
 112
 113     private InputStream loadFile(final String fileName, boolean isAbsolute) throws URISyntaxException, IOException {
 114         final File file;
 115         if (isAbsolute) {
 116             file = new File(fileName);
 117         } else {
 118             file = new File(getClass().getResource(fileName).toURI());
 119         }
 120
 121         return new NamedFileInputStream(file, fileName);
 122     }
 123 }