| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.layoutengine; |
| |
| import javax.xml.transform.TransformerException; |
| |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| |
| import org.apache.xml.utils.PrefixResolver; |
| import org.apache.xml.utils.PrefixResolverDefault; |
| import org.apache.xpath.XPathAPI; |
| import org.apache.xpath.objects.XBoolean; |
| import org.apache.xpath.objects.XObject; |
| |
| import org.apache.fop.intermediate.IFCheck; |
| |
| /** |
| * Simple check that requires an XPath expression to evaluate to true. |
| */ |
| public class TrueCheck implements LayoutEngineCheck, IFCheck { |
| |
| private String xpath; |
| private String failureMessage; |
| private PrefixResolver prefixResolver; |
| |
| /** |
| * Creates a new instance from a DOM node. |
| * @param node DOM node that defines this check |
| */ |
| public TrueCheck(Node node) { |
| this.xpath = node.getAttributes().getNamedItem("xpath").getNodeValue(); |
| Node nd = node.getAttributes().getNamedItem("fail-msg"); |
| if (nd != null) { |
| this.failureMessage = nd.getNodeValue(); |
| } |
| this.prefixResolver = new PrefixResolverDefault(node); |
| } |
| |
| /** {@inheritDoc} */ |
| public void check(LayoutResult result) { |
| doCheck(result.getAreaTree()); |
| } |
| |
| /** {@inheritDoc} */ |
| public void check(Document intermediate) { |
| doCheck(intermediate); |
| } |
| |
| private void doCheck(Document doc) { |
| XObject res; |
| try { |
| res = XPathAPI.eval(doc, xpath, prefixResolver); |
| } catch (TransformerException e) { |
| throw new RuntimeException("XPath evaluation failed: " + e.getMessage()); |
| } |
| if (!XBoolean.S_TRUE.equals(res)) { |
| if (failureMessage != null) { |
| throw new AssertionError(failureMessage); |
| } else { |
| throw new AssertionError( |
| "Expected XPath expression to evaluate to 'true', but got '" |
| + res + "' (" + this + ")"); |
| } |
| } |
| |
| } |
| |
| /** {@inheritDoc} */ |
| public String toString() { |
| return "XPath: " + xpath; |
| } |
| |
| } |