1 files changed, 108 insertions, 0 deletions
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/configuration/ConfigValidatorLoader.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/configuration/ConfigValidatorLoader.java
new file mode 100644
index 00000000..0e1e2580
--- /dev/null
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/configuration/ConfigValidatorLoader.java
@@ -0,0 +1,108 @@
+package at.gv.egiz.pdfas.lib.impl.configuration;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.ServiceLoader;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.egiz.pdfas.common.exceptions.ErrorConstants;
+import at.gv.egiz.pdfas.common.exceptions.PDFASError;
+import at.gv.egiz.pdfas.lib.api.Configuration;
+import at.gv.egiz.pdfas.lib.backend.PDFASBackend;
+import at.gv.egiz.pdfas.lib.configuration.ConfigurationValidator;
+
+public class ConfigValidatorLoader implements ErrorConstants{
+	/** The Constant logger. */
+	private static final Logger logger = LoggerFactory
+			.getLogger(ConfigValidatorLoader.class);
+	
+	/** The configuration verifier loader. */
+	private static ServiceLoader<ConfigurationValidator> configurationValidator = ServiceLoader.load(ConfigurationValidator.class);
+	
+	/** The available verification backends. */
+	private static Map<String, ConfigurationValidator> availableValidators = new HashMap<String, ConfigurationValidator>();
+	
+	/** The Constant VALIDATOR_CONFIG. */
+	public static final String VALIDATOR_CONFIG = "runtime.config.validator";
+	
+	/** The default validator. */
+	private static ConfigurationValidator defaultValidator = null; 
+	
+	static {
+		logger.debug("building Configuration Validator");
+		
+		Iterator<ConfigurationValidator> backendIterator = configurationValidator.iterator();
+		
+		while(backendIterator.hasNext()) {
+			ConfigurationValidator backend = backendIterator.next();
+			logger.debug("Loading " + backend.getName() + " [" + backend.getClass().getName() + "]");
+			availableValidators.put(backend.getName(), backend);
+			logger.debug("PDF-Backend added " + backend.getName());
+			if(backend.usedAsDefault()) {
+				defaultValidator = backend;
+				logger.debug("PDF-Backend added as default " + backend.getName());
+			}
+		}
+		
+		logger.debug("Configuration Validator Backends constructed");
+		
+		if(defaultValidator != null) {
+			logger.debug("Default backend is " + defaultValidator.getName());
+		}
+	}
+	
+	/**
+	 * Gets the Configuration valdiator.
+	 *
+	 * @param configuration the configuration
+	 * @return the validator backend
+	 * @throws PDFASError the PDFAS error
+	 */
+	public static ConfigurationValidator getConfigurationValidator(Configuration configuration) throws PDFASError {
+		String backendName = configuration.getValue(VALIDATOR_CONFIG);
+		return getConfigurationValidator(backendName);
+	}
+	
+	/**
+	 * Gets the Validator by name.
+	 *
+	 * @param name the name
+	 * @return the validator backend
+	 * @throws PDFASError the PDFAS error
+	 */
+	public static ConfigurationValidator getConfigurationValidator(String name) throws PDFASError {
+		if(name != null) {
+			if(availableValidators.containsKey(name)) {
+				return availableValidators.get(name);
+			}
+			throw new PDFASError(ERROR_NO_CONF_VALIDATION_BACKEND);
+		}
+		
+		if(defaultValidator != null) {
+			return defaultValidator;
+		}
+		
+		throw new PDFASError(ERROR_NO_CONF_VALIDATION_BACKEND);
+	}
+	
+	/**
+	 * Gets the Configuration Validator.
+	 *
+	 * @return the validator backend
+	 * @throws PDFASError the PDFAS error
+	 */
+	public static ConfigurationValidator getConfigurationValidator() throws PDFASError {
+		if(defaultValidator != null) {
+			return defaultValidator;
+		}
+		
+		throw new PDFASError(ERROR_NO_CONF_VALIDATION_BACKEND);
+	}
+	
+	public static Map<String, ConfigurationValidator> getAvailableValidators(){
+			return availableValidators;
+	}
+}