Example usage for org.apache.commons.jxpath JXPathContext setIdentityManager

Introduction

In this page you can find the example usage for org.apache.commons.jxpath JXPathContext setIdentityManager.

Prototype

public void setIdentityManager(IdentityManager idManager) 

Source Link

Document

Install an identity manager that will be used by the context to look up a node by its ID.

Usage

From source file:org.firesoa.common.jxpath.XMLModelTestCase.java

public void testID() {
    context.setIdentityManager(new IdentityManager() {
        public Pointer getPointerByID(JXPathContext context, String id) {
            NodePointer ptr = (NodePointer) context.getPointer("/");
            ptr = ptr.getValuePointer(); // Unwrap the container
            return ptr.getPointerByID(context, id);
        }/*ww w  .ja  v  a 2 s  .  c  om*/
    });

    assertXPathValueAndPointer(context, "id(101)//street", "Tangerine Drive", "id('101')/address[1]/street[1]");

    assertXPathPointerLenient(context, "id(105)/address/street", "id(105)/address/street");
}

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From source file:org.paxml.core.Context.java

/**
 * Select objects with xpath./*from  w w w  .  ja va2s  .c o m*/
 * 
 * @param from
 *            the object to select properties from, null to select from
 *            entire context.
 * @param xpath
 *            the xpath
 * @param alwaysList
 *            true to return a list with one item inside if the xpath
 *            results in one object to be selected.
 * @return either a list of objects that satisfies the xpath, or the object
 *         itself if the xpath results in one object to be selected and the
 *         "alwaysList" parameter is false.
 */
public Object xpathSelect(Object from, String xpath, boolean alwaysList) {
    Variables vars = new BasicVariables();

    if (from == null) {
        ObjectTree nameGlobal = getRootContext().getNameMap(false, true);
        ObjectTree nameLocal = getNameMap(true, false);

        vars.declareVariable(XPATH_NAME_GLOBAL_VAR, nameGlobal);
        vars.declareVariable(XPATH_NAME_LOCAL_VAR, nameLocal);

        ObjectTree nameAuto = new ObjectTree(null, nameGlobal);
        nameAuto.addValues(nameLocal);

        from = nameAuto;
    }

    JXPathContext xpathContext = JXPathContext.newContext(from);
    xpathContext.setVariables(vars);
    xpathContext.setIdentityManager(this);

    setXpathFunctions(xpathContext);

    try {
        Object selected = xpathContext.iterate(xpath);

        List<Object> list = new ArrayList<Object>(1);
        if (selected instanceof Iterator) {
            final Iterator<?> it = (Iterator<?>) selected;
            while (it.hasNext()) {
                Object obj = it.next();
                list.add(getXpathResultObject(obj));
            }
            if (list.size() == 1) {
                selected = list.get(0);
            } else {
                selected = list;
            }
        } else {

            selected = getXpathResultObject(selected);

            if (selected != null && alwaysList) {
                list.add(selected);
            }
        }
        if (alwaysList) {
            return list;
        } else {
            if (selected instanceof List) {
                list = (List) selected;
                final int size = list.size();
                if (size == 0) {
                    return null;
                } else if (size == 1) {
                    return list.get(0);
                }
            }
            return selected;
        }
    } catch (NullPointerException e) {
        // when jxpath throws null pointer exception, it has problem
        // searching non-existing paths
        return null;
    }
}

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