Examples with MacroTransformationContext org.xwiki.rendering.transformation.MacroTransformationContext used on opensource projects

Example 41 with MacroTransformationContext

use of org.xwiki.rendering.transformation.MacroTransformationContext in project xwiki-platform by xwiki.

the class DefaultWikiMacro method execute.

@Override
public List<Block> execute(WikiMacroParameters parameters, String macroContent, MacroTransformationContext context) throws MacroExecutionException {
    validate(parameters, macroContent);
    // Parse the wiki macro content.
    XDOM xdom = prepareWikiMacroContent(context);
    // Prepare macro context.
    Map<String, Object> macroBinding = new HashMap<>();
    macroBinding.put(MACRO_PARAMS_KEY, parameters);
    macroBinding.put(MACRO_CONTENT_KEY, macroContent);
    macroBinding.put(MACRO_DESCRIPTOR_KEY, getDescriptor());
    macroBinding.put(MACRO_CONTEXT_KEY, context);
    macroBinding.put(MACRO_RESULT_KEY, null);
    // Extension point to add more wiki macro bindings
    try {
        List<WikiMacroBindingInitializer> bindingInitializers = this.componentManager.getInstanceList(WikiMacroBindingInitializer.class);
        for (WikiMacroBindingInitializer bindingInitializer : bindingInitializers) {
            bindingInitializer.initialize(this.macroDocumentReference, parameters, macroContent, context, macroBinding);
        }
    } catch (ComponentLookupException e) {
    // TODO: we should probably log something but that should never happen
    }
    // Execute the macro
    ObservationManager observation = null;
    try {
        observation = this.componentManager.getInstance(ObservationManager.class);
    } catch (ComponentLookupException e) {
    // TODO: maybe log something
    }
    // Get XWiki context
    Map<String, Object> xwikiContext = null;
    try {
        Execution execution = this.componentManager.getInstance(Execution.class);
        ExecutionContext econtext = execution.getContext();
        if (econtext != null) {
            xwikiContext = (Map<String, Object>) execution.getContext().getProperty("xwikicontext");
        }
    } catch (ComponentLookupException e) {
    // TODO: maybe log something
    }
    try {
        Transformation macroTransformation = this.componentManager.getInstance(Transformation.class, MACRO_HINT);
        if (xwikiContext != null) {
            // Place macro context inside xwiki context ($xcontext.macro).
            xwikiContext.put(MACRO_KEY, macroBinding);
        }
        MacroBlock wikiMacroBlock = context.getCurrentMacroBlock();
        MacroMarkerBlock wikiMacroMarker = new MacroMarkerBlock(wikiMacroBlock.getId(), wikiMacroBlock.getParameters(), wikiMacroBlock.getContent(), xdom.getChildren(), wikiMacroBlock.isInline());
        // Make sure to use provided metadatas
        MetaDataBlock metaDataBlock = new MetaDataBlock(Collections.<Block>singletonList(wikiMacroMarker), xdom.getMetaData());
        // Make sure the context XDOM contains the wiki macro content
        wikiMacroBlock.getParent().replaceChild(metaDataBlock, wikiMacroBlock);
        // "Emulate" the fact that wiki macro block is still part of the XDOM (what is in the XDOM is a
        // MacroMarkerBlock and MacroTransformationContext current macro block only support MacroBlock so we can't
        // switch it without breaking some APIs)
        wikiMacroBlock.setParent(metaDataBlock.getParent());
        wikiMacroBlock.setNextSiblingBlock(metaDataBlock.getNextSibling());
        wikiMacroBlock.setPreviousSiblingBlock(metaDataBlock.getPreviousSibling());
        try {
            if (observation != null) {
                observation.notify(STARTEXECUTION_EVENT, this, macroBinding);
            }
            // Perform internal macro transformations.
            TransformationContext txContext = new TransformationContext(context.getXDOM(), this.syntax);
            txContext.setId(context.getId());
            RenderingContext renderingContext = componentManager.getInstance(RenderingContext.class);
            ((MutableRenderingContext) renderingContext).transformInContext(macroTransformation, txContext, wikiMacroMarker);
        } finally {
            // Restore context XDOM to its previous state
            metaDataBlock.getParent().replaceChild(wikiMacroBlock, metaDataBlock);
        }
        return extractResult(wikiMacroMarker.getChildren(), macroBinding, context);
    } catch (Exception ex) {
        throw new MacroExecutionException("Error while performing internal macro transformations", ex);
    } finally {
        if (xwikiContext != null) {
            xwikiContext.remove(MACRO_KEY);
        }
        if (observation != null) {
            observation.notify(ENDEXECUTION_EVENT, this);
        }
    }
}