Java tutorial
/** * Copyright (c) 2010-2015, openHAB.org and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html */ package org.openhab.binding.homematic.internal.bus; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.math.NumberUtils; import org.openhab.binding.homematic.internal.config.BindingAction; import org.openhab.binding.homematic.internal.config.binding.ActionConfig; import org.openhab.binding.homematic.internal.config.binding.DatapointConfig; import org.openhab.binding.homematic.internal.config.binding.HomematicBindingConfig; import org.openhab.binding.homematic.internal.config.binding.ProgramConfig; import org.openhab.binding.homematic.internal.config.binding.VariableConfig; import org.openhab.binding.homematic.internal.converter.ConverterFactory; import org.openhab.binding.homematic.internal.converter.state.Converter; import org.openhab.core.items.Item; import org.openhab.core.library.types.OnOffType; import org.openhab.model.item.binding.BindingConfigParseException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Class to parse the key - value based config for an Homematic item. * <p> * Example: * </p> * * <pre> * Dimmer Light_Kitchen "Light Kitchen [%.2f]" {homematic="address=KEQ0012345, channel=1, parameter=PRESS_SHORT"} * * Switch Test_Program "Start TestProgram" {homematic="program=TestProgram"} * * Switch Var_Holidaymode "Holidaymode" {homematic="variable=Holidaymode"} * </pre> * * @author Gerhard Riegler * @since 1.5.0 */ public class BindingConfigParser { private static final Logger logger = LoggerFactory.getLogger(BindingConfigParser.class); /** * Parses the bindingConfig of an item and returns a HomematicBindingConfig. */ public HomematicBindingConfig parse(Item item, String bindingConfig) throws BindingConfigParseException { bindingConfig = StringUtils.trimToEmpty(bindingConfig); bindingConfig = StringUtils.removeStart(bindingConfig, "{"); bindingConfig = StringUtils.removeEnd(bindingConfig, "}"); String[] entries = bindingConfig.split("[,]"); HomematicBindingConfigHelper helper = new HomematicBindingConfigHelper(); for (String entry : entries) { String[] entryParts = StringUtils.trimToEmpty(entry).split("[=]"); if (entryParts.length != 2) { throw new BindingConfigParseException("Each entry must have a key and a value"); } String key = StringUtils.trim(entryParts[0]); // convert entry id to device if necessary if ("id".equalsIgnoreCase(key)) { logger.info("Please change the Homematic binding with the attribute 'id' to 'address' in entry: " + entry + " -> " + StringUtils.replace(entry, "id=", "address=")); key = "address"; } String value = StringUtils.trim(entryParts[1]); value = StringUtils.removeStart(value, "\""); value = StringUtils.removeEnd(value, "\""); try { helper.getClass().getDeclaredField(key).set(helper, value); } catch (Exception e) { throw new BindingConfigParseException("Could not set value " + value + " for attribute " + key); } } Converter<?> converter = null; // if (helper.isValidDatapoint() || helper.isValidVariable()) { // converter = instantiateConverter(helper.converter); // } BindingAction bindingAction = getBindingAction(item, helper.action); if (helper.isValidDatapoint()) { return new DatapointConfig(helper.address, helper.channel, helper.parameter, converter, bindingAction, helper.isForceUpdate(), NumberUtils.toDouble(helper.delay)); } else if (helper.isValidVariable()) { return new VariableConfig(helper.variable, converter, bindingAction, helper.isForceUpdate(), NumberUtils.toDouble(helper.delay)); } else if (helper.isValidProgram()) { if (!acceptsOnOffType(item)) { throw new BindingConfigParseException( "Programs can only be attached to items which accepts OnOffType commands, ignoring item " + item.getName()); } return new ProgramConfig(helper.program, bindingAction); } else if (bindingAction != null) { return new ActionConfig(bindingAction); } else { throw new BindingConfigParseException("Invalid binding: " + bindingConfig); } } /** * If a converter is specified in the binding, try to instantiate it. */ @SuppressWarnings("unused") private Converter<?> instantiateConverter(String converterName) { Converter<?> converter = null; if (converterName != null) { try { converter = (Converter<?>) Class.forName(converterName).newInstance(); } catch (Exception e) { try { converter = (Converter<?>) Class.forName(ConverterFactory.CONVERTER_PACKAGE + converterName) .newInstance(); } catch (Exception e1) { logger.warn("Can't instantiate converter " + converterName + ", ignoring it!"); } } } return converter; } /** * Parses the BindingAction if available. */ private BindingAction getBindingAction(Item item, String action) { if (action == null) { return null; } BindingAction bindingAction = BindingAction.parse(action); if (bindingAction == null) { logger.warn("Can't parse action {}, only {} and {} allowed. Ignoring action parameter in item {}!", action, BindingAction.RELOAD_VARIABLES, BindingAction.RELOAD_DATAPOINTS, item.getName()); } else if (!acceptsOnOffType(item)) { logger.warn( "Actions can only be attached to items which accepts OnOffType commands, ignoring action attribute in item {}!", action, item.getName()); bindingAction = null; } return bindingAction; } /** * Returns true, if the item accepts the OnOffType. */ private boolean acceptsOnOffType(Item item) { return item.getAcceptedCommandTypes().contains(OnOffType.class); } /** * Helper class for parsing the bindingConfig. */ private class HomematicBindingConfigHelper { public String address; public String channel; public String parameter; @SuppressWarnings("unused") public String converter; public String variable; public String program; public String action; public String forceUpdate; public String delay; protected boolean isValidDatapoint() { return StringUtils.isNotBlank(address) && StringUtils.isNotBlank(channel) && StringUtils.isNotBlank(parameter); } protected boolean isValidVariable() { return StringUtils.isNotBlank(variable); } protected boolean isValidProgram() { return StringUtils.isNotBlank(program); } protected boolean isForceUpdate() { return "true".equalsIgnoreCase(forceUpdate); } } }