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/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.xml;
import java.util.*;
import org.xml.sax.*;
import org.w3c.dom.*;
import com.mchange.v1.util.DebugUtils;
public final class DomParseUtils
{
final static boolean DEBUG = true;
/**
* @return null if child doesn't exist.
*/
public static String allTextFromUniqueChild(Element elem, String childTagName)
throws DOMException
{ return allTextFromUniqueChild( elem, childTagName, false ); }
/**
* @return null if child doesn't exist.
*/
public static String allTextFromUniqueChild(Element elem, String childTagName, boolean trim)
throws DOMException
{
Element uniqueChild = uniqueChildByTagName( elem, childTagName );
if (uniqueChild == null)
return null;
else
return DomParseUtils.allTextFromElement( uniqueChild, trim );
}
public static Element uniqueChild(Element elem, String childTagName) throws DOMException
{ return uniqueChildByTagName( elem, childTagName); }
/**
* @deprecated use uniqueChild(Element elem, String childTagName)
*/
public static Element uniqueChildByTagName(Element elem, String childTagName) throws DOMException
{
NodeList nl = elem.getElementsByTagName(childTagName);
int len = nl.getLength();
if (DEBUG)
DebugUtils.myAssert( len <= 1 ,
"There is more than one (" + len + ") child with tag name: " +
childTagName + "!!!" );
return (len == 1 ? (Element) nl.item( 0 ) : null);
}
public static String allText(Element elem) throws DOMException
{ return allTextFromElement( elem ); }
public static String allText(Element elem, boolean trim) throws DOMException
{ return allTextFromElement( elem, trim ); }
/** @deprecated use allText(Element elem) */
public static String allTextFromElement(Element elem) throws DOMException
{ return allTextFromElement( elem, false); }
/** @deprecated use allText(Element elem, boolean trim) */
public static String allTextFromElement(Element elem, boolean trim) throws DOMException
{
StringBuffer textBuf = new StringBuffer();
NodeList nl = elem.getChildNodes();
for (int j = 0, len = nl.getLength(); j < len; ++j)
{
Node node = nl.item(j);
if (node instanceof Text) //includes Text and CDATA!
textBuf.append(node.getNodeValue());
}
String out = textBuf.toString();
return ( trim ? out.trim() : out );
}
public static String[] allTextFromImmediateChildElements( Element parent, String tagName )
throws DOMException
{ return allTextFromImmediateChildElements( parent, tagName, false ); }
public static String[] allTextFromImmediateChildElements( Element parent, String tagName, boolean trim )
throws DOMException
{
NodeList nl = immediateChildElementsByTagName( parent, tagName );
int len = nl.getLength();
String[] out = new String[ len ];
for (int i = 0; i < len; ++i)
out[i] = allText( (Element) nl.item(i), trim );
return out;
}
public static NodeList immediateChildElementsByTagName( Element parent, String tagName )
throws DOMException
{ return getImmediateChildElementsByTagName( parent, tagName ); }
/**
* @deprecated use immediateChildrenByTagName( Element parent, String tagName )
*/
public static NodeList getImmediateChildElementsByTagName( Element parent, String tagName )
throws DOMException
{
final List nodes = new ArrayList();
for (Node child = parent.getFirstChild(); child != null; child = child.getNextSibling())
if (child instanceof Element && ((Element) child).getTagName().equals(tagName))
nodes.add(child);
return new NodeList()
{
public int getLength()
{ return nodes.size(); }
public Node item( int i )
{ return (Node) nodes.get( i ); }
};
}
public static String allTextFromUniqueImmediateChild(Element elem, String childTagName)
throws DOMException
{
Element uniqueChild = uniqueImmediateChildByTagName( elem, childTagName );
if (uniqueChild == null)
return null;
return DomParseUtils.allTextFromElement( uniqueChild );
}
public static Element uniqueImmediateChild(Element elem, String childTagName)
throws DOMException
{ return uniqueImmediateChildByTagName( elem, childTagName); }
/**
* @deprecated use uniqueImmediateChild(Element elem, String childTagName)
*/
public static Element uniqueImmediateChildByTagName(Element elem, String childTagName)
throws DOMException
{
NodeList nl = getImmediateChildElementsByTagName(elem, childTagName);
int len = nl.getLength();
if (DEBUG)
DebugUtils.myAssert( len <= 1 ,
"There is more than one (" + len + ") child with tag name: " +
childTagName + "!!!" );
return (len == 1 ? (Element) nl.item( 0 ) : null);
}
/**
* @deprecated use Element.getAttribute(String val)
*/
public static String attrValFromElement(Element element, String attrName)
throws DOMException
{
Attr attr = element.getAttributeNode( attrName );
return (attr == null ? null : attr.getValue());
}
private DomParseUtils()
{}
}
