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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/branches/2.0-Beta1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyXPathFunction.java | 294 |
1 files changed, 0 insertions, 294 deletions
diff --git a/sca-java-2.x/branches/2.0-Beta1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyXPathFunction.java b/sca-java-2.x/branches/2.0-Beta1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyXPathFunction.java deleted file mode 100644 index d0b45b2d7d..0000000000 --- a/sca-java-2.x/branches/2.0-Beta1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyXPathFunction.java +++ /dev/null @@ -1,294 +0,0 @@ -/* - * Licensed to the Apache Software Foundation (ASF) under one - * or more contributor license agreements. See the NOTICE file - * distributed with this work for additional information - * regarding copyright ownership. The ASF licenses this file - * to you under the Apache License, Version 2.0 (the - * "License"); you may not use this file except in compliance - * with the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, - * software distributed under the License is distributed on an - * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY - * KIND, either express or implied. See the License for the - * specific language governing permissions and limitations - * under the License. - */ - -package org.apache.tuscany.sca.policy.xml; - -import java.util.ArrayList; -import java.util.Arrays; -import java.util.HashSet; -import java.util.List; -import java.util.Set; -import java.util.logging.Level; -import java.util.logging.Logger; -import java.util.regex.Matcher; -import java.util.regex.Pattern; - -import javax.xml.namespace.NamespaceContext; -import javax.xml.namespace.QName; -import javax.xml.xpath.XPathFunction; -import javax.xml.xpath.XPathFunctionException; - -import org.w3c.dom.Document; -import org.w3c.dom.Node; -import org.w3c.dom.NodeList; - -/** - * The SCA-defined XPath function - */ -public class PolicyXPathFunction implements XPathFunction { - private static Logger logger = Logger.getLogger(PolicyXPathFunction.class.getName()); - - static final QName InterfaceRef = new QName(PolicyConstants.SCA11_NS, "InterfaceRef"); - static final QName OperationRef = new QName(PolicyConstants.SCA11_NS, "OperationRef"); - static final QName MessageRef = new QName(PolicyConstants.SCA11_NS, "MessageRef"); - static final QName IntentRefs = new QName(PolicyConstants.SCA11_NS, "IntentRefs"); - static final QName URIRef = new QName(PolicyConstants.SCA11_NS, "URIRef"); - - static final Set<QName> functions = - new HashSet<QName>(Arrays.asList(InterfaceRef, OperationRef, MessageRef, IntentRefs, URIRef)); - - private NamespaceContext namespaceContext; - private final QName functionName; - - public PolicyXPathFunction(NamespaceContext namespaceContext, QName functionName) { - super(); - this.namespaceContext = namespaceContext; - this.functionName = functionName; - } - - private Node getContextNode(List args) { - if (args.size() >= 2) { - NodeList nodeList = (NodeList)args.get(1); - if (nodeList.getLength() > 0) { - return nodeList.item(0); - } - } - return null; - } - - public Object evaluate(List args) throws XPathFunctionException { - if (logger.isLoggable(Level.FINE)) { - logger.fine(functionName + "(" + args + ")"); - } - - String arg = (String)args.get(0); - Node node = getContextNode(args); - /** - * If the xpath expression that contains the function does not select any nodes - * (eg IntentRefs('someIntent')), the context node passed in will be a Document. - * In this case we need to iterate over every Node in the Document and evaluate it. - * - * If the xpath expression does select nodes (eg //sca:component[IntentRefs('someIntent')]) - * then xpath will call evaluate for each node and we only need to return the result for that - * node. - */ - if ( node instanceof Document ) - return evaluateDocument(arg, (Document)node); - else - return evaluateNode(arg, node); - } - - public Object evaluateNode(String arg, Node node) { - if (InterfaceRef.equals(functionName)) { - return evaluateInterface(arg, node); - } else if (OperationRef.equals(functionName)) { - String[] params = arg.split("/"); - if (params.length != 2) { - throw new IllegalArgumentException("Invalid argument: " + arg); - } - String interfaceName = params[0]; - String operationName = params[1]; - return evaluateOperation(interfaceName, operationName, node); - } else if (MessageRef.equals(functionName)) { - String[] params = arg.split("/"); - if (params.length != 3) { - throw new IllegalArgumentException("Invalid argument: " + arg); - } - String interfaceName = params[0]; - String operationName = params[1]; - String messageName = params[2]; - return evaluateMessage(interfaceName, operationName, messageName, node); - } else if (URIRef.equals(functionName)) { - return evaluateURI(arg, node); - } else if (IntentRefs.equals(functionName)) { - String[] intents = arg.split("(\\s)+"); - return evaluateIntents(intents, node); - } else { - return Boolean.FALSE; - } - } - - private class NodeListImpl implements NodeList { - - private ArrayList<Node> list; - - public NodeListImpl() { - this.list = new ArrayList<Node>(); - } - public int getLength() { - return this.list.size(); - } - - public Node item(int index) { - return this.list.get(index); - } - public boolean add(Node node) { - return this.list.add(node); - - } - - } - private Object evaluateDocument(String arg, Document doc) { - NodeListImpl retList = new NodeListImpl(); - NodeList elements = doc.getElementsByTagName("*"); - for ( int i=0; i < elements.getLength(); i++) { - Object node = evaluateNode(arg, elements.item(i)); - if ( node != null ) - retList.add((Node)node); - } - return retList; - } - - private Boolean evaluateInterface(String interfaceName, Node node) { - return Boolean.FALSE; - } - - private Boolean evaluateOperation(String interfaceName, String operationName, Node node) { - return Boolean.FALSE; - } - - private Boolean evaluateMessage(String interfaceName, String operationName, String messageName, Node node) { - return Boolean.FALSE; - } - - private Boolean evaluateURI(String uri, Node node) { - return Boolean.FALSE; - } - - /** - * Evaluates a single node for the given intents. - * @param intents - * @param node - * @return - */ - private Object evaluateIntents(String[] intents, Node node) { - if ( node == null ) - return false; - - if ( node.getAttributes() != null ) { - for ( int i=0; i < node.getAttributes().getLength(); i++) { - Node attr = node.getAttributes().item(i); - - if ( "requires".equalsIgnoreCase(attr.getNodeName())) { - - for ( int j = 0; j < intents.length; j++ ) { - // Check negative intents - if ( intents[j].startsWith("!")) { - if ( matchIntent(intents[j].substring(1), attr, node.getNamespaceURI())) - return null; - } else if ( !matchIntent(intents[j], attr, node.getNamespaceURI())){ - return null; - } - } - return node; - } - - } - } - - return null; - } - - - - /** - * Determine whether the given intent is present in the "requires" attribute - * @param intent - * @param node - * @param namespaceURI - * @return - */ - private boolean matchIntent(String intent, Node node, String namespaceURI) { - String[] requires = node.getNodeValue().split("(\\s)+"); - QName intentName = getStringAsQName(intent); - - - for ( int i=0; i < requires.length; i++ ) { - QName nodeName = null; - int idx = requires[i].indexOf(':'); - - // No prefix specified - if ( idx == -1 ) { - nodeName = new QName(namespaceURI, requires[i]); - } else { - String prefix = requires[i].substring(0, idx); - String name = requires[i].substring(idx + 1); - String ns = node.lookupNamespaceURI(prefix); - nodeName = new QName(ns, name, prefix); - } - if ( intentName.equals(nodeName)) - return true; - } - return false; - } - - - private QName getStringAsQName(String intent) { - int idx = intent.indexOf(':'); - if (idx == -1) - return new QName(intent); - - String prefix = intent.substring(0, idx); - intent = intent.substring(idx + 1); - - return new QName(namespaceContext.getNamespaceURI(prefix), intent, prefix); - - } - - - private static Pattern FUNCTION; - static { - String functionPattern = "(URIRef|InterfaceRef|OperationRef|MessageRef|IntentRefs)\\s*\\(([^\\)]*)\\)"; - FUNCTION = Pattern.compile(functionPattern); - } - - /** Adds the node as an argument to the XPath function. - * Required in order to have access to the NodeList within the function - */ - public static String normalize(String attachTo, String scaPrefix) { - // Get rid of any whitespace - attachTo = attachTo.trim(); - - Matcher matcher = FUNCTION.matcher(attachTo); - boolean result = matcher.find(); - if (result) { - StringBuffer sb = new StringBuffer(); - do { - String function = matcher.group(1); - String args = matcher.group(2); - if ( (matcher.start() == 0) || (attachTo.charAt( matcher.start() -1) != ':' )) { - function = scaPrefix + ":" + function; - } - String replacement = null; - if (args.trim().length() > 0) { - replacement = function + "(" + args + "," + "self::node())"; - } else { - replacement = function + "(self::node())"; - } - matcher.appendReplacement(sb, replacement); - result = matcher.find(); - } while (result); - - matcher.appendTail(sb); - return sb.toString(); - } - return attachTo; - } - -} |