Examples of org.apache.beehive.netui.script.Expression

org.apache.beehive.netui.script.Expression
This class implements an abstraction atop an Expression object. It provides access to metadata about the parsed expression including the data binding context and tokens that constitute the expression.


        // given a hierarchy of "container.container.container.item.someProp", the correct parent needs
        // to be found so that expression rewriting can happen correctly.
        //
        // ensure that this expression contains container.item
        Expression parsed = getExpressionEvaluator().parseExpression(name);
        assert parsed != null;


        int containerCount = 0;
        List tokens = parsed.getTokens();
        for (int i = 0; i < tokens.size(); i++) {
            String tok = tokens.get(i).toString();
            if (i == 0) {
                if (!tok.equals("container"))
                    break;
                else
                    continue;
            }
            // this skips the "current" IDataAccessProvider
            else if (tok.equals("container"))
                containerCount++;
            else if (tok.equals("item"))
                break;
        }


        if (_logger.isDebugEnabled()) _logger.debug("container parent count: " + containerCount);


        // now walk up the DataAccessProvier hierarchy until the top-most parent is found
        // the top-most parent is the first one that does not reference "container.item" but
        // is bound directly to a specific object such as "actionForm" or "pageFlow".  This 
        // handles the case where a set of nested IDataAccessProvider tags are "skipped" by
        // an expression like "container.container.container.item.foo".  In order to find
        // the correct root to start rewriting the names, one needs to walk up three 
        // DAPs in order to find the correct root from which to start. 
        //
        // In general, containerCount is zero here for the "container.item.foo" case.
        for (int i = 0; i < containerCount; i++) {
            dap = dap.getProviderParent();
        }


        // now, the top-most DAP parent is known
        assert dap != null;
        
        // strip off the "container.item" from the expression that is being rewritten
        // this should be two tokens into the expression.
        if (containerCount > 0) {
            name = parsed.getExpression(containerCount);
        }


        // now, change the binding context of the parent DAP hierarchy to create a 
        // String that looks like "actionForm.customers[42].order[12].lineItem[2].name"
        // note, this is done without using the expression that was passed-in and

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            throws ExpressionEvaluationException
    {
        if (_logger.isDebugEnabled())
            _logger.debug("assign index to name: " + dap.getDataSource());


        Expression parsedDataSource = getExpressionEvaluator().parseExpression(dap.getDataSource());
        assert parsedDataSource != null;


        // @todo: perf
        boolean isContainerBound = (parsedDataSource.getTokens().get(0)).toString().equals("container");


        // rewrite the name of the current IDataAccessProvider.
        String parentName = null;
        // if the current DAP has a parent IDataAccessProvider, rewrite the name of the parent
        if (dap.getProviderParent() != null)
            parentName = rewriteNameInternal(dap.getProviderParent());
        // if the current DAP has no parent, or it does not reference the "container." binding context,
        // we've found the "root" IDataAccessProvider
        else if (dap.getProviderParent() == null || (dap.getProviderParent() != null && !isContainerBound)) {
            return dap.getDataSource();
        }


        // now, we've found the root and can start rewriting the expressions throughout 
        // the rest of the DAP hierarchy
        if (_logger.isDebugEnabled()) {
            _logger.debug("changeContext: DAP.dataSource=" + dap.getDataSource() + " oldContext=container newContext=" +
                    parentName + " currentIndex=" + dap.getProviderParent().getCurrentIndex() +
                    " parentName is container: " + isContainerBound);
        }


        String retVal = null;
        String ds = dap.getDataSource();


        // If the current DAP's dataSource is "container.item", the binding context needs to change to that
        // of the parent.  This case should only occur for the last token -- the "name" passed into
        // the method.  Oterwise, just replace the "container" to that of the parent.  Both are 
        // qualified with the DAP's current index so that "actionForm.customers" becomes 
        // "actionForm.customers[12]".  


        boolean isContainerItemBound = false;
        if (isContainerBound && (parsedDataSource.getTokens().get(1)).toString().equals("item"))
            isContainerItemBound = true;


        if (isContainerItemBound)
            retVal = changeContext(ds, "container.item", parentName, dap.getProviderParent().getCurrentIndex());
        else

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                            if (!requestHasPopulated)
                                ee.update(expr, updateValue, variableResolver, true);
                            // must check the expression to make sure pageFlow. and globalApp. don't get executed more than once
                            else
                            {
                                Expression pe = ee.parseExpression(expr);
                                String contextName = pe.getContext();
                                if (!contextName.equals(PAGE_FLOW_CONTEXT) && !contextName.equals(GLOBAL_APP_CONTEXT))
                                    ee.update(expr, updateValue, variableResolver, true);
                            }
                        }
                    }

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                            // common case, make this fast
                            if (!requestHasPopulated)
                                ee.update(expr, updateValue, variableResolver, true);
                            // must check the expression to make sure pageFlow. and globalApp. don't get executed more than once
                            else {
                                Expression pe = ee.parseExpression(expr);
                                String contextName = pe.getContext();
                                if (!contextName.equals(PAGE_FLOW_CONTEXT) && !contextName.equals(GLOBAL_APP_CONTEXT))
                                    ee.update(expr, updateValue, variableResolver, true);
                            }
                        }
                    }

View Full Code Here


        // given a hierarchy of "container.container.container.item.someProp", the correct parent needs
        // to be found so that expression rewriting can happen correctly.
        //
        // ensure that this expression contains container.item
        Expression parsed = getExpressionEvaluator().parseExpression(name);
        assert parsed != null;


        int containerCount = 0;
        List tokens = parsed.getTokens();
        for (int i = 0; i < tokens.size(); i++) {
            String tok = tokens.get(i).toString();
            if (i == 0) {
                if (!tok.equals("container"))
                    break;
                else
                    continue;
            }
            // this skips the "current" IDataAccessProvider
            else if (tok.equals("container"))
                containerCount++;
            else if (tok.equals("item"))
                break;
        }


        if (_logger.isDebugEnabled()) _logger.debug("container parent count: " + containerCount);


        // now walk up the DataAccessProvier hierarchy until the top-most parent is found
        // the top-most parent is the first one that does not reference "container.item" but
        // is bound directly to a specific object such as "actionForm" or "pageFlow".  This 
        // handles the case where a set of nested IDataAccessProvider tags are "skipped" by
        // an expression like "container.container.container.item.foo".  In order to find
        // the correct root to start rewriting the names, one needs to walk up three 
        // DAPs in order to find the correct root from which to start. 
        //
        // In general, containerCount is zero here for the "container.item.foo" case.
        for (int i = 0; i < containerCount; i++) {
            dap = dap.getProviderParent();
        }


        // now, the top-most DAP parent is known
        assert dap != null;
        
        // strip off the "container.item" from the expression that is being rewritten
        // this should be two tokens into the expression.
        if (containerCount > 0) {
            name = parsed.getExpression(containerCount);
        }


        // now, change the binding context of the parent DAP hierarchy to create a 
        // String that looks like "actionForm.customers[42].order[12].lineItem[2].name"
        // note, this is done without using the expression that was passed-in and

View Full Code Here

            throws ExpressionEvaluationException
    {
        if (_logger.isDebugEnabled())
            _logger.debug("assign index to name: " + dap.getDataSource());


        Expression parsedDataSource = getExpressionEvaluator().parseExpression(dap.getDataSource());
        assert parsedDataSource != null;


        // @todo: perf
        boolean isContainerBound = (parsedDataSource.getTokens().get(0)).toString().equals("container");


        // rewrite the name of the current IDataAccessProvider.
        String parentName = null;
        // if the current DAP has a parent IDataAccessProvider, rewrite the name of the parent
        if (dap.getProviderParent() != null)
            parentName = rewriteNameInternal(dap.getProviderParent());
        // if the current DAP has no parent, or it does not reference the "container." binding context,
        // we've found the "root" IDataAccessProvider
        else if (dap.getProviderParent() == null || (dap.getProviderParent() != null && !isContainerBound)) {
            return dap.getDataSource();
        }


        // now, we've found the root and can start rewriting the expressions throughout 
        // the rest of the DAP hierarchy
        if (_logger.isDebugEnabled()) {
            _logger.debug("changeContext: DAP.dataSource=" + dap.getDataSource() + " oldContext=container newContext=" +
                    parentName + " currentIndex=" + dap.getProviderParent().getCurrentIndex() +
                    " parentName is container: " + isContainerBound);
        }


        String retVal = null;
        String ds = dap.getDataSource();


        // If the current DAP's dataSource is "container.item", the binding context needs to change to that
        // of the parent.  This case should only occur for the last token -- the "name" passed into
        // the method.  Oterwise, just replace the "container" to that of the parent.  Both are 
        // qualified with the DAP's current index so that "actionForm.customers" becomes 
        // "actionForm.customers[12]".  


        boolean isContainerItemBound = false;
        if (isContainerBound && (parsedDataSource.getTokens().get(1)).toString().equals("item"))
            isContainerItemBound = true;


        if (isContainerItemBound)
            retVal = changeContext(ds, "container.item", parentName, dap.getProviderParent().getCurrentIndex());
        else

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Related Classes of org.apache.beehive.netui.script.Expression

org.apache.beehive.netui.pageflow.ProcessPopulate

org.apache.beehive.netui.tags.naming.IndexedNameInterceptor

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