Java XPath Expression hasAnimatedPng(ImageReader reader)

Description

has Animated Png

License

Apache License

Declaration

private static boolean hasAnimatedPng(ImageReader reader) throws IOException 

Method Source Code

//package com.java2s;
/*/*  w  w w  .jav  a  2s  .  co  m*/
 * Copyright 1998-2013 Linux.org.ru
 *    Licensed 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.
 */

import org.w3c.dom.Node;

import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import java.io.IOException;

public class Main {
    private static boolean hasAnimatedPng(ImageReader reader) throws IOException {
        if (!"png".equals(reader.getFormatName())) {
            return false;
        }
        try {
            IIOMetadata metadata = reader.getImageMetadata(0);
            XPath xPath = XPathFactory.newInstance().newXPath();

            for (String name : metadata.getMetadataFormatNames()) {
                Node root = metadata.getAsTree(name);
                if ((Boolean) xPath.evaluate("//UnknownChunk[@type='acTL'] | //UnknownChunk[@type='fcTL']", root,
                        XPathConstants.BOOLEAN)) {
                    return true;
                }
            }
        } catch (XPathExpressionException e) {
            throw new IOException(e.getMessage());
        }
        return false;
    }
}

Related

1. extractNode(XPath xpath, String nodePath, String xmlString)
2. extractNodeList(XPath xpath, String nodePath, String xmlString)
3. extractNodes(File xmlFile, String xpathLocator)
4. extractValue(String xml, String xpathExpression)
5. findElements(final String xPathExpression, final Element root)
6. isLegalXPath(final String xPath)
7. isValidFilter(String xPathString)
8. isXPathAbsolute(String path)
9. loadFromXmlNode(String xmlFile, String prefix)