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package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xalan.internal.templates.Constants;
import com.sun.org.apache.xpath.internal.ExtensionsProvider;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.compiler.FunctionTable;
import com.sun.org.apache.xpath.internal.objects.XBoolean;
import com.sun.org.apache.xpath.internal.objects.XObject;

Execute the ExtFunctionAvailable() function.
@xsl.usageadvanced
/** * Execute the ExtFunctionAvailable() function. * @xsl.usage advanced */
public class FuncExtFunctionAvailable extends FunctionOneArg { static final long serialVersionUID = 5118814314918592241L; transient private FunctionTable m_functionTable = null;
Execute the function. The function must return a valid object.
Params:
  • xctxt – The current execution context.
Throws:
Returns:A valid XObject.
/** * Execute the function. The function must return * a valid object. * @param xctxt The current execution context. * @return A valid XObject. * * @throws javax.xml.transform.TransformerException */
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException { String prefix; String namespace; String methName; String fullName = m_arg0.execute(xctxt).str(); int indexOfNSSep = fullName.indexOf(':'); if (indexOfNSSep < 0) { prefix = ""; namespace = Constants.S_XSLNAMESPACEURL; methName = fullName; } else { prefix = fullName.substring(0, indexOfNSSep); namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix); if (null == namespace) return XBoolean.S_FALSE; methName = fullName.substring(indexOfNSSep + 1); } if (namespace.equals(Constants.S_XSLNAMESPACEURL)) { try { if (null == m_functionTable) m_functionTable = new FunctionTable(); return m_functionTable.functionAvailable(methName) ? XBoolean.S_TRUE : XBoolean.S_FALSE; } catch (Exception e) { return XBoolean.S_FALSE; } } else { //dml ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject(); return extProvider.functionAvailable(namespace, methName) ? XBoolean.S_TRUE : XBoolean.S_FALSE; } }
The function table is an instance field. In order to access this instance field during evaluation, this method is called at compilation time to insert function table information for later usage. It should only be used during compiling of XPath expressions.
Params:
  • aTable – an instance of the function table
/** * The function table is an instance field. In order to access this instance * field during evaluation, this method is called at compilation time to * insert function table information for later usage. It should only be used * during compiling of XPath expressions. * @param aTable an instance of the function table */
public void setFunctionTable(FunctionTable aTable){ m_functionTable = aTable; } }