+++ /dev/null
-package org.apache.lucene.xmlparser;
-import java.io.Reader;
-
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.Node;
-import org.xml.sax.InputSource;
-/**
- * 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.
- */
-
-/**
- *
- */
-public class DOMUtils
-{
- public static Element getChildByTagOrFail(Element e, String name) throws ParserException
- {
- Element kid = getChildByTagName(e, name);
- if (null == kid)
- {
- throw new ParserException(e.getTagName() + " missing \"" + name
- + "\" child element");
- }
- return kid;
- }
-
- public static Element getFirstChildOrFail(Element e) throws ParserException
- {
- Element kid = getFirstChildElement(e);
- if (null == kid)
- {
- throw new ParserException(e.getTagName()
- + " does not contain a child element");
- }
- return kid;
- }
-
- public static String getAttributeOrFail(Element e, String name) throws ParserException
- {
- String v = e.getAttribute(name);
- if (null == v)
- {
- throw new ParserException(e.getTagName() + " missing \"" + name
- + "\" attribute");
- }
- return v;
- }
- public static String getAttributeWithInheritanceOrFail(Element e, String name) throws ParserException
- {
- String v = getAttributeWithInheritance(e, name);
- if (null == v)
- {
- throw new ParserException(e.getTagName() + " missing \"" + name
- + "\" attribute");
- }
- return v;
- }
- public static String getNonBlankTextOrFail(Element e) throws ParserException
- {
- String v = getText(e);
- if (null != v)
- v = v.trim();
- if (null == v || 0 == v.length())
- {
- throw new ParserException(e.getTagName() + " has no text");
- }
- return v;
- }
-
-
-
-
-
-
- /* Convenience method where there is only one child Element of a given name */
- public static Element getChildByTagName(Element e, String name)
- {
- for (Node kid = e.getFirstChild(); kid != null; kid = kid.getNextSibling())
- {
- if( (kid.getNodeType()==Node.ELEMENT_NODE) && (name.equals(kid.getNodeName())) )
- {
- return (Element)kid;
- }
- }
- return null;
- }
-
- /**
- * Returns an attribute value from this node, or first parent node with this attribute defined
- * @param element
- * @param attributeName
- * @return A non-zero-length value if defined, otherwise null
- */
- public static String getAttributeWithInheritance(Element element, String attributeName)
- {
- String result=element.getAttribute(attributeName);
- if( (result==null)|| ("".equals(result) ) )
- {
- Node n=element.getParentNode();
- if((n==element)||(n==null))
- {
- return null;
- }
- if(n instanceof Element)
- {
- Element parent=(Element) n;
- return getAttributeWithInheritance(parent,attributeName);
- }
- return null; //we reached the top level of the document without finding attribute
- }
- return result;
- }
-
-
-
- /* Convenience method where there is only one child Element of a given name */
- public static String getChildTextByTagName(Element e, String tagName)
- {
- Element child=getChildByTagName(e,tagName);
- if(child!=null)
- {
- return getText(child);
- }
- return null;
- }
-
- /* Convenience method to append a new child with text*/
- public static Element insertChild(Element parent, String tagName, String text)
- {
- Element child = parent.getOwnerDocument().createElement(tagName);
- parent.appendChild(child);
- if(text!=null)
- {
- child.appendChild(child.getOwnerDocument().createTextNode(text));
- }
- return child;
- }
-
- public static String getAttribute(Element element, String attributeName, String deflt)
- {
- String result=element.getAttribute(attributeName);
- if( (result==null)|| ("".equals(result) ) )
- {
- return deflt;
- }
- return result;
- }
- public static float getAttribute(Element element, String attributeName, float deflt)
- {
- String result=element.getAttribute(attributeName);
- if( (result==null)|| ("".equals(result) ) )
- {
- return deflt;
- }
- return Float.parseFloat(result);
- }
-
- public static int getAttribute(Element element, String attributeName, int deflt)
- {
- String result=element.getAttribute(attributeName);
- if( (result==null)|| ("".equals(result) ) )
- {
- return deflt;
- }
- return Integer.parseInt(result);
- }
-
- public static boolean getAttribute(Element element, String attributeName,
- boolean deflt)
- {
- String result = element.getAttribute(attributeName);
- if ((result == null) || ("".equals(result)))
- {
- return deflt;
- }
- return Boolean.valueOf(result).booleanValue();
- }
-
- /* Returns text of node and all child nodes - without markup */
- //MH changed to Node from Element 25/11/2005
- public static String getText(Node e)
- {
- StringBuilder sb=new StringBuilder();
- getTextBuffer(e, sb);
- return sb.toString();
- }
-
- public static Element getFirstChildElement(Element element)
- {
- for (Node kid = element.getFirstChild(); kid != null; kid = kid
- .getNextSibling())
- {
- if (kid.getNodeType() == Node.ELEMENT_NODE)
- {
- return (Element) kid;
- }
- }
- return null;
- }
-
- private static void getTextBuffer(Node e, StringBuilder sb)
- {
- for (Node kid = e.getFirstChild(); kid != null; kid = kid.getNextSibling())
- {
- switch(kid.getNodeType())
- {
- case Node.TEXT_NODE:
- {
- sb.append(kid.getNodeValue());
- break;
- }
- case Node.ELEMENT_NODE:
- {
- getTextBuffer(kid, sb);
- break;
- }
- case Node.ENTITY_REFERENCE_NODE:
- {
- getTextBuffer(kid, sb);
- break;
- }
- }
- }
- }
-
- /**
- * Helper method to parse an XML file into a DOM tree, given a reader.
- * @param is reader of the XML file to be parsed
- * @return an org.w3c.dom.Document object
- */
- public static Document loadXML(Reader is)
- {
-
- DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
- DocumentBuilder db = null;
-
- try
- {
- db = dbf.newDocumentBuilder();
- }
- catch (Exception se)
- {
- throw new RuntimeException("Parser configuration error", se);
- }
-
- // Step 3: parse the input file
- org.w3c.dom.Document doc = null;
- try
- {
- doc = db.parse(new InputSource(is));
- //doc = db.parse(is);
- }
- catch (Exception se)
- {
- throw new RuntimeException("Error parsing file:" + se, se);
- }
-
- return doc;
- }
-}
-
-
-
fnp / pylucene.git / blobdiff