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- /*
- * 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 RuntimeException(failureMessage);
- } else {
- throw new RuntimeException(
- "Expected XPath expression to evaluate to 'true', but got '"
- + res + "' (" + this + ")");
- }
- }
-
- }
-
- /** {@inheritDoc} */
- public String toString() {
- return "XPath: " + xpath;
- }
-
- }
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