1 package org.simantics.scl.osgi.internal;
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.net.URISyntaxException;
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7 import java.nio.charset.Charset;
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8 import java.nio.file.Files;
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9 import java.nio.file.Path;
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10 import java.nio.file.Paths;
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11 import java.security.MessageDigest;
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12 import java.security.NoSuchAlgorithmException;
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13 import java.util.ArrayList;
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14 import java.util.Arrays;
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16 import org.eclipse.core.runtime.FileLocator;
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17 import org.osgi.framework.Bundle;
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18 import org.osgi.framework.wiring.BundleWiring;
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19 import org.simantics.scl.compiler.module.ImportDeclaration;
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20 import org.simantics.scl.compiler.module.repository.UpdateListener;
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21 import org.simantics.scl.compiler.source.EncodedTextualModuleSource;
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22 import org.simantics.scl.compiler.types.Type;
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24 public class BundleModuleSource extends EncodedTextualModuleSource {
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26 public static final ImportDeclaration[] DEFAULT_IMPORTS = new ImportDeclaration[] {
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27 new ImportDeclaration("Builtin", ""),
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28 new ImportDeclaration("StandardLibrary", "")
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31 public static final ImportDeclaration[] DEFAULT_IMPORTS_FOR_STANDARD_LIBRARY = new ImportDeclaration[] {
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32 new ImportDeclaration("Builtin", ""),
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35 public final Bundle bundle;
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36 public final URL url;
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38 private byte[] digest;
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39 private ArrayList<UpdateListener> listeners;
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41 public BundleModuleSource(String moduleName, Bundle bundle, URL url) {
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43 this.bundle = bundle;
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48 protected ImportDeclaration[] getBuiltinImports(UpdateListener listener) {
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49 if(bundle.getSymbolicName().equals("org.simantics.scl.runtime"))
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50 return DEFAULT_IMPORTS_FOR_STANDARD_LIBRARY;
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52 return DEFAULT_IMPORTS;
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55 private byte[] computeDigest() {
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57 InputStream stream = url.openStream();
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59 MessageDigest digest = MessageDigest.getInstance("SHA1");
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60 byte[] buffer = new byte[1024];
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62 int count = stream.read(buffer);
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65 digest.update(buffer, 0, count);
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67 return digest.digest();
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68 } catch (NoSuchAlgorithmException e) {
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69 e.printStackTrace();
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74 } catch(IOException e) {
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75 e.printStackTrace();
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81 protected InputStream getSourceStream(UpdateListener listener)
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82 throws IOException {
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84 digest = computeDigest();
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85 if(listener != null) {
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86 if(listeners == null)
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87 listeners = new ArrayList<UpdateListener>(2);
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88 listeners.add(listener);
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90 return url.openStream();
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94 public ClassLoader getClassLoader() {
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95 if(bundle.getSymbolicName().equals("org.simantics.scl.runtime"))
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96 return Type.class.getClassLoader();
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98 BundleWiring wiring = bundle.adapt(BundleWiring.class);
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100 return wiring.getClassLoader();
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102 return getClass().getClassLoader();
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106 public void checkUpdates() {
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107 if(digest != null && listeners != null) {
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108 byte[] newDigest = computeDigest();
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109 if(!Arrays.equals(digest, newDigest)) {
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110 digest = newDigest;
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111 ArrayList<UpdateListener> oldListeners = listeners;
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113 for(UpdateListener listener : oldListeners)
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114 listener.notifyAboutUpdate();
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119 private Path getPath() throws IOException {
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121 return Paths.get(FileLocator.toFileURL(url).toURI());
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122 } catch (URISyntaxException e) {
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123 throw new IOException(e);
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128 public boolean isUpdateable() {
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130 return Files.exists(getPath());
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131 } catch (IOException e) {
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137 public void update(String newSourceText) {
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139 Path path = getPath();
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140 Files.write(path, newSourceText.getBytes(Charset.forName("UTF-8")));
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141 } catch(IOException e) {
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142 e.printStackTrace();
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147 public void clear() {
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148 if (listeners != null) {
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