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package eu.dnetlib.springutils.condbean;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Properties;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* This is the original implementation of Robert Maldon's property expression parser, factored out in a
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* ConditionExpressionParser so that we can easly replace it with a more powerful parser.
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*
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* @see JParsecConditionExpression
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*
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* @author marko
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*
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*/
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public class TrivialConditionExpressionParser implements ConditionExpressionParser {
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private static final Log log = LogFactory.getLog(TrivialConditionExpressionParser.class); // NOPMD by marko on 11/24/08 5:02 PM
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/** Default placeholder prefix: "${". */
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public static final String PH_PREFIX = "${";
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/** Default placeholder suffix: "}". */
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public static final String PH_SUFFIX = "}";
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private PropertyFinder finder;
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@Override
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public boolean expressionValue(final String expression) {
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log.debug("EXPRESSION: " + expression);
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log.debug("EXPRESSION VALUE: " + getProperty(expression));
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return !StringUtils.isEmpty(getProperty(expression));
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}
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protected String getProperty(final String strVal) {
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if (StringUtils.isEmpty(strVal))
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return null;
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if (strVal.startsWith(PH_PREFIX) && strVal.endsWith(PH_SUFFIX))
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return basicGetProperty(strVal.substring(PH_PREFIX.length(), strVal.length() - PH_SUFFIX.length()));
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return basicGetProperty(strVal);
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}
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protected String basicGetProperty(final String name) {
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return finder.getProperty(name);
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}
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protected String xxbasicGetProperty(final String name) {
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// TODO: merge properties from many files (wildcards) and provide a configuration
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final Properties props = new Properties();
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try {
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final InputStream input = TrivialConditionExpressionParser.class.getResourceAsStream("/eu/dnetlib/cnr-default.properties");
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if (input == null)
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log.warn("cannot open properties (null)");
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else
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props.load(input);
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} catch (IOException e) {
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log.warn("cannot open properties", e);
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}
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final String res = props.getProperty(name);
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if (res != null && !res.isEmpty())
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return res;
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return System.getProperty(name);
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}
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public PropertyFinder getFinder() {
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return finder;
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}
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public void setFinder(PropertyFinder finder) {
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this.finder = finder;
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}
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}
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