Java XML Attribute Read getLong(String attrName, Map runtimeAttributes, Node docElement)

Description

Get a long value.

License

Apache License

Parameter

Parameter	Description
attrName	attribute name to find
runtimeAttributes	runtime attributes
docElement	correct element that should have specified attribute

Return

specified long value

Declaration

public static long getLong(String attrName,
        Map<String, String> runtimeAttributes, Node docElement) 

Method Source Code

//package com.java2s;
/*//from ww w.ja v  a2  s . co m
 * 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.
 */

import java.util.Map;

import org.w3c.dom.Node;

public class Main {
    /**
     * Get a long value.  Try the runtime attributes first and then back off to
     * the document element.  Throw a RuntimeException if the attribute is not
     * found or if the value is not parseable as a long.
     *
     * @param attrName attribute name to find
     * @param runtimeAttributes runtime attributes
     * @param docElement correct element that should have specified attribute
     * @return specified long value
     */
    public static long getLong(String attrName,
            Map<String, String> runtimeAttributes, Node docElement) {
        String stringValue = getStringValue(attrName, runtimeAttributes,
                docElement);
        if (stringValue != null) {
            try {
                return Long.parseLong(stringValue);
            } catch (NumberFormatException e) {
                //swallow
            }
        }
        throw new RuntimeException(
                "Need to specify a \"long\" value in -- " + attrName
                        + " -- in commandline or in config file!");
    }

    private static String getStringValue(String attrName,
            Map<String, String> runtimeAttributes, Node docElement) {
        String stringValue = runtimeAttributes.get(attrName);
        if (stringValue == null) {
            Node staleNode = docElement.getAttributes().getNamedItem(
                    attrName);
            if (staleNode != null) {
                stringValue = staleNode.getNodeValue();
            }
        }
        return stringValue;
    }
}

Related

1. getLong(Node xmlNode, String attributeLabel)
2. getLongAttribute(NamedNodeMap namedNodeMap, String name)
3. getLongAttribute(String name, Element el)
4. getNameAttribute(final Node aNode)
5. getNamedAttribute(final Node aNode, final String attributeName)