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package net.sf.basedb.meludi; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.List; |
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import net.sf.basedb.core.ConfigurationException; |
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import net.sf.basedb.util.Values; |
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import org.jdom2.Attribute; |
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import org.jdom2.Element; |
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import org.jdom2.xpath.XPathFactory; |
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/** |
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Utility class for working with MeLuDI XML configuration file. |
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@author nicklas |
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@since Reggie 2.18 |
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@since 1.5 |
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*/ |
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public class XmlConfig |
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{ |
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private final Element root; |
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private final String id; |
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/** |
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Create a new configuration item using the given XML element as the |
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root element. |
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@param root The root XML element |
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@param id The id of the root element (used in error message) |
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*/ |
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public XmlConfig(Element root, String id) |
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{ |
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this.root = root; |
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this.id = id; |
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} |
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/** |
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Get the XML root element. |
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*/ |
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public Element getRoot() |
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{ |
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return root; |
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} |
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/** |
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Get the value of a required configuration option. If no |
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value is found an exception is thrown. |
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@param xpath An XPath expression identifying a (single) configuration element |
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@param parameterSet A named parameter set that should be used before the unnamed parameters |
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@since 3.1 |
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*/ |
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public String getRequiredConfig(String xpath, String parameterSet) |
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{ |
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String value = getConfig(xpath, parameterSet, null); |
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if (value == null) |
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{ |
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throw new ConfigurationException("Can't find '" + xpath + "' setting for " + id + "[parameter-set: " + parameterSet + "]"); |
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} |
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return value; |
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} |
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/** |
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Shortcut for {@link #getConfig(String, String, String)} with null |
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values for parameterSet and defaultValue. |
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@since 4.1 |
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*/ |
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public String getConfig(String xpath) |
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{ |
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return getConfig(xpath, null, null); |
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} |
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|
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/** |
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Searches for an ordered list of configuration values all with |
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the given root prefix. For example if prefix is 'run-archive' |
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this will look for 'run-archive-N', 'run-archive-(N+1)', and so on |
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until an empty element or no element is found (N=starting index). |
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@since 4.6 |
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*/ |
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public List<String> getConfigList(String prefix, int startAt) |
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{ |
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int index = startAt; |
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List<String> list = new ArrayList<>(); |
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do |
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{ |
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String value = getConfig(prefix + "-" + index); |
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if (value == null) break; |
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list.add(value); |
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index++; |
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} while (true); |
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return list; |
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} |
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|
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/** |
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Get the value of a configuration option. If no value is found the default value is used. |
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|
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@param xpath An XPath expression identifying a (single) configuration element or attribute |
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@param parameterSet A named parameter set that should be used before the unnamed parameters |
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@since 3.1 |
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*/ |
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public String getConfig(String xpath, String parameterSet, String defaultValue) |
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{ |
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String value = null; |
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if (xpath == null) return defaultValue; |
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List<Object> list = XPathFactory.instance().compile(xpath).evaluate(root); |
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for (Object n : list) |
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{ |
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Element e = null; |
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String tmp = null; |
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if (n instanceof Element) |
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{ |
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e = (Element)n; |
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tmp = Values.getStringOrNull(e.getTextTrim()); |
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} |
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else if (n instanceof Attribute) |
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{ |
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Attribute a = (Attribute)n; |
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e = a.getParent(); |
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tmp = Values.getStringOrNull(a.getValue()); |
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} |
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if (e != null) |
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{ |
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String ps = e.getAttributeValue("parameter-set"); |
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if (ps == null) |
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{ |
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// Default parameter set; use this unless we find the specific parameter set |
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value = tmp; |
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if (parameterSet == null) break; |
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} |
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else if (parameterSet != null && Arrays.asList(ps.split(",")).indexOf(parameterSet) != -1) |
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{ |
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// We have found the parameter set we are lookup for, break and use this value |
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value = tmp; |
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break; |
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} |
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} |
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} |
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return value == null ? defaultValue : value; |
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} |
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|
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/** |
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Get all parameters in the given parameter set. |
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@since 3.1 |
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*/ |
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public List<Element> getAllInParameterSet(String parameterSet) |
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{ |
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if (parameterSet == null) return Collections.emptyList(); |
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|
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List<Object> list = XPathFactory.instance().compile("//*[@parameter-set]").evaluate(root); |
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List<Element> parameters = new ArrayList<Element>(); |
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|
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for (Object o : list) |
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{ |
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Element e = (Element)o; |
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String ps = e.getAttributeValue("parameter-set"); |
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if (Arrays.asList(ps.split(",")).indexOf(parameterSet) != -1) |
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{ |
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parameters.add(e); |
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} |
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} |
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return parameters; |
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} |
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|
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} |