Example usage for javax.el VariableMapper setVariable

Introduction

In this page you can find the example usage for javax.el VariableMapper setVariable.

Prototype

public abstract ValueExpression setVariable(String variable, ValueExpression expression);

Source Link

Usage

From source file:org.richfaces.taglib.ColumnsTag.java

/**
 * Sets page request variables//  ww w .j  a  v a  2s .  c  o m
 * 
 * @throws JspTagException
 */
private void exposeVariables() throws JspTagException {

    /*
     * We need to support null items returned from next(); we do this simply
     * by passing such non-items through to the scoped variable as
     * effectively 'null' (that is, by calling removeAttribute()).
     * 
     * Also, just to be defensive, we handle the case of a null 'status'
     * object as well.
     * 
     * We call getCurrent() and getLoopStatus() (instead of just using
     * 'item' and 'status') to bridge to subclasses correctly. A subclass
     * can override getCurrent() or getLoopStatus() but still depend on our
     * doStartTag() and doAfterBody(), which call this method
     * (exposeVariables()), to expose 'item' and 'status' correctly.
     */

    // Set up var variable
    if (itemId != null) {
        if (index == null)
            pageContext.removeAttribute(itemId, PageContext.PAGE_SCOPE);
        else if (__value != null) {
            VariableMapper vm = pageContext.getELContext().getVariableMapper();
            if (vm != null) {
                ValueExpression ve = getVarExpression(__value);
                vm.setVariable(itemId, ve);
            }
        } else
            pageContext.setAttribute(itemId, index);
    }

    // Set up index variable

    if (indexId != null) {
        if (index == null)
            pageContext.removeAttribute(indexId, PageContext.PAGE_SCOPE);
        else {
            IteratedIndexExpression indexExpression = new IteratedIndexExpression(index);
            VariableMapper vm = pageContext.getELContext().getVariableMapper();
            if (vm != null) {
                vm.setVariable(indexId, indexExpression);
            }
        }
    }

}

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