org.eclipse.core.resources.builders用于提供一种操作，这种操作可以在IResource改变的时候自动去build,如同改变java文件，会自动进行build，显示错误一样，我们扩展这个builder，并且在自己的项目中使用。我们要做的就是实现build的过程，至于时机由eclipse控制
<extension id="builder的ID" name="builder的NAME" point="org.eclipse.core.resources.builders"> <builder hasNature="true"> <run class="builder的CLASS"> </run> </builder> </extension> <extension id="nature的ID" name="nature的NAME" point="org.eclipse.core.resources.natures"> <runtime> <run class="nature的CLASS"> </run> </runtime> <builder id="builder所在的插件ID+.+builder的ID"> </builder> </extension>
<extension id="builder的ID" name="builder的NAME" point="org.eclipse.core.resources.builders"> <builder hasNature="true"> <run class="builder的CLASS"> </run> </builder> </extension> <extension id="nature的ID" name="nature的NAME" point="org.eclipse.core.resources.natures"> <runtime> <run class="nature的CLASS"> </run> </runtime> <builder id="builder所在的插件ID+.+builder的ID"> </builder> </extension>
Builder的例子代码：
package project_builder.builder; import java.util.Map; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IMarker; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IResource; import org.eclipse.core.resources.IResourceDelta; import org.eclipse.core.resources.IResourceDeltaVisitor; import org.eclipse.core.resources.IResourceVisitor; import org.eclipse.core.resources.IncrementalProjectBuilder; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IProgressMonitor; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import org.xml.sax.helpers.DefaultHandler; public class SampleBuilder extends IncrementalProjectBuilder { class SampleDeltaVisitor implements IResourceDeltaVisitor { /* * (non-Javadoc) * * @see org.eclipse.core.resources.IResourceDeltaVisitor#visit(org.eclipse.core.resources.IResourceDelta) */ public boolean visit(IResourceDelta delta) throws CoreException { IResource resource = delta.getResource(); switch (delta.getKind()) { case IResourceDelta.ADDED: // handle added resource checkXML(resource); break; case IResourceDelta.REMOVED: // handle removed resource break; case IResourceDelta.CHANGED: // handle changed resource checkXML(resource); break; } //return true to continue visiting children. return true; } } class SampleResourceVisitor implements IResourceVisitor { public boolean visit(IResource resource) { checkXML(resource); //return true to continue visiting children. return true; } } class XMLErrorHandler extends DefaultHandler { private IFile file; public XMLErrorHandler(IFile file) { this.file = file; } private void addMarker(SAXParseException e, int severity) { SampleBuilder.this.addMarker(file, e.getMessage(), e .getLineNumber(), severity); } public void error(SAXParseException exception) throws SAXException { addMarker(exception, IMarker.SEVERITY_ERROR); } public void fatalError(SAXParseException exception) throws SAXException { addMarker(exception, IMarker.SEVERITY_ERROR); } public void warning(SAXParseException exception) throws SAXException { addMarker(exception, IMarker.SEVERITY_WARNING); } } public static final String BUILDER_ID = "Project_Builder.sampleBuilder"; private static final String MARKER_TYPE = "Project_Builder.xmlProblem"; private SAXParserFactory parserFactory; private void addMarker(IFile file, String message, int lineNumber, int severity) { try { IMarker marker = file.createMarker(MARKER_TYPE); marker.setAttribute(IMarker.MESSAGE, message); marker.setAttribute(IMarker.SEVERITY, severity); if (lineNumber == -1) { lineNumber = 1; } marker.setAttribute(IMarker.LINE_NUMBER, lineNumber); } catch (CoreException e) { } } /* * (non-Javadoc) * * @see org.eclipse.core.internal.events.InternalBuilder#build(int, * java.util.Map, org.eclipse.core.runtime.IProgressMonitor) */ protected IProject[] build(int kind, Map args, IProgressMonitor monitor) throws CoreException { if (kind == FULL_BUILD) { fullBuild(monitor); } else { IResourceDelta delta = getDelta(getProject()); if (delta == null) { fullBuild(monitor); } else { incrementalBuild(delta, monitor); } } return null; } void checkXML(IResource resource) { if (resource instanceof IFile && resource.getName().endsWith(".xml")) { IFile file = (IFile) resource; deleteMarkers(file); XMLErrorHandler reporter = new XMLErrorHandler(file); try { getParser().parse(file.getContents(), reporter); } catch (Exception e1) { } } } private void deleteMarkers(IFile file) { try { file.deleteMarkers(MARKER_TYPE, false, IResource.DEPTH_ZERO); } catch (CoreException ce) { } } protected void fullBuild(final IProgressMonitor monitor) throws CoreException { try { getProject().accept(new SampleResourceVisitor()); } catch (CoreException e) { } } private SAXParser getParser() throws ParserConfigurationException, SAXException { if (parserFactory == null) { parserFactory = SAXParserFactory.newInstance(); } return parserFactory.newSAXParser(); } protected void incrementalBuild(IResourceDelta delta, IProgressMonitor monitor) throws CoreException { // the visitor does the work. delta.accept(new SampleDeltaVisitor()); } }
Nature的例子代码:
package project_builder.builder; import org.eclipse.core.resources.ICommand; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IProjectDescription; import org.eclipse.core.resources.IProjectNature; import org.eclipse.core.runtime.CoreException; public class SampleNature implements IProjectNature { /** * ID of this project nature */ public static final String NATURE_ID = "Project_Builder.sampleNature"; private IProject project; /* * (non-Javadoc) * * @see org.eclipse.core.resources.IProjectNature#configure() */ public void configure() throws CoreException { IProjectDescription desc = project.getDescription(); ICommand[] commands = desc.getBuildSpec(); for (int i = 0; i < commands.length; ++i) { if (commands[i].getBuilderName().equals(SampleBuilder.BUILDER_ID)) { return; } } ICommand[] newCommands = new ICommand[commands.length + 1]; System.arraycopy(commands, 0, newCommands, 0, commands.length); ICommand command = desc.newCommand(); command.setBuilderName(SampleBuilder.BUILDER_ID); newCommands[newCommands.length - 1] = command; desc.setBuildSpec(newCommands); project.setDescription(desc, null); } /* * (non-Javadoc) * * @see org.eclipse.core.resources.IProjectNature#deconfigure() */ public void deconfigure() throws CoreException { IProjectDescription description = getProject().getDescription(); ICommand[] commands = description.getBuildSpec(); for (int i = 0; i < commands.length; ++i) { if (commands[i].getBuilderName().equals(SampleBuilder.BUILDER_ID)) { ICommand[] newCommands = new ICommand[commands.length - 1]; System.arraycopy(commands, 0, newCommands, 0, i); System.arraycopy(commands, i + 1, newCommands, i, commands.length - i - 1); description.setBuildSpec(newCommands); return; } } } /* * (non-Javadoc) * * @see org.eclipse.core.resources.IProjectNature#getProject() */ public IProject getProject() { return project; } /* * (non-Javadoc) * * @see org.eclipse.core.resources.IProjectNature#setProject(org.eclipse.core.resources.IProject) */ public void setProject(IProject project) { this.project = project; } }