Java tutorial
/* * GoogleBaseParser.java * * Created on November 17, 2005, 11:31 AM * * This library is provided under dual licenses. * You may choose the terms of the Lesser General Public License or the Apache * License at your discretion. * * Copyright (C) 2005 Robert Cooper, Temple of the Screaming Penguin * * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * * Licensed 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. */ package com.rometools.modules.base.io; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.io.IOException; import java.lang.reflect.Array; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Locale; import java.util.Properties; import org.jdom2.Element; import org.jdom2.Namespace; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.rometools.modules.base.GoogleBase; import com.rometools.modules.base.GoogleBaseImpl; import com.rometools.modules.base.types.CurrencyEnumeration; import com.rometools.modules.base.types.DateTimeRange; import com.rometools.modules.base.types.FloatUnit; import com.rometools.modules.base.types.GenderEnumeration; import com.rometools.modules.base.types.IntUnit; import com.rometools.modules.base.types.PaymentTypeEnumeration; import com.rometools.modules.base.types.PriceTypeEnumeration; import com.rometools.modules.base.types.ShippingType; import com.rometools.modules.base.types.Size; import com.rometools.modules.base.types.YearType; import com.rometools.rome.feed.module.Module; import com.rometools.rome.io.ModuleParser; /** * DOCUMENT ME! * * @author <a href="mailto:cooper@screaming-penguin.com">Robert "kebernet" Cooper</a> * @version $Revision: 1.3 $ */ public class GoogleBaseParser implements ModuleParser { private static final Logger LOG = LoggerFactory.getLogger(GoogleBaseParser.class); public static final char[] INTEGER_CHARS = "-1234567890".toCharArray(); public static final char[] FLOAT_CHARS = "-1234567890.".toCharArray(); public static final SimpleDateFormat SHORT_DT_FMT = new SimpleDateFormat("yyyy-MM-dd"); public static final SimpleDateFormat LONG_DT_FMT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"); static final Namespace NS = Namespace.getNamespace(GoogleBase.URI); static final Properties PROPS2TAGS = new Properties(); static PropertyDescriptor[] pds = null; static { try { pds = Introspector.getBeanInfo(GoogleBaseImpl.class).getPropertyDescriptors(); PROPS2TAGS.load( GoogleBaseParser.class.getResourceAsStream("/com/rometools/modules/base/io/tags.properties")); } catch (final IOException e) { e.printStackTrace(); LOG.error("Unable to read properties file for Google Base tags!", e); } catch (final IntrospectionException e) { e.printStackTrace(); LOG.error("Unable to get property descriptors for GoogleBaseImpl!", e); } } /** * Creates a new instance of GoogleBaseParser */ public GoogleBaseParser() { super(); } @Override public Module parse(final Element element, final Locale locale) { final HashMap<String, PropertyDescriptor> tag2pd = new HashMap<String, PropertyDescriptor>(); final GoogleBaseImpl module = new GoogleBaseImpl(); try { for (final PropertyDescriptor pd : pds) { final String tagName = GoogleBaseParser.PROPS2TAGS.getProperty(pd.getName()); if (tagName == null) { LOG.debug("Property: {} doesn't have a tag mapping.", pd.getName()); } else { tag2pd.put(tagName, pd); } } } catch (final Exception e) { throw new RuntimeException("Exception building tag to property mapping. ", e); } final List<Element> children = element.getChildren(); final Iterator<Element> it = children.iterator(); while (it.hasNext()) { final Element child = it.next(); if (child.getNamespace().equals(GoogleBaseParser.NS)) { final PropertyDescriptor pd = tag2pd.get(child.getName()); if (pd != null) { try { handleTag(child, pd, module); } catch (final Exception e) { LOG.warn("Unable to handle tag: " + child.getName(), e); e.printStackTrace(); } } } } return module; } public static String stripNonValidCharacters(final char[] validCharacters, final String input) { final StringBuffer newString = new StringBuffer(); for (int i = 0; i < input.length(); i++) { for (final char validCharacter : validCharacters) { if (input.charAt(i) == validCharacter) { newString.append(validCharacter); } } } return newString.toString(); } @Override public String getNamespaceUri() { return GoogleBase.URI; } private void handleTag(final Element tag, final PropertyDescriptor pd, final GoogleBase module) throws Exception { Object tagValue = null; if (pd.getPropertyType() == Integer.class || pd.getPropertyType().getComponentType() == Integer.class) { tagValue = new Integer( GoogleBaseParser.stripNonValidCharacters(GoogleBaseParser.INTEGER_CHARS, tag.getText())); } else if (pd.getPropertyType() == Float.class || pd.getPropertyType().getComponentType() == Float.class) { tagValue = new Float( GoogleBaseParser.stripNonValidCharacters(GoogleBaseParser.FLOAT_CHARS, tag.getText())); } else if (pd.getPropertyType() == String.class || pd.getPropertyType().getComponentType() == String.class) { tagValue = tag.getText(); } else if (pd.getPropertyType() == URL.class || pd.getPropertyType().getComponentType() == URL.class) { tagValue = new URL(tag.getText().trim()); } else if (pd.getPropertyType() == Boolean.class || pd.getPropertyType().getComponentType() == Boolean.class) { tagValue = new Boolean(tag.getText().trim()); } else if (pd.getPropertyType() == Date.class || pd.getPropertyType().getComponentType() == Date.class) { final String text = tag.getText().trim(); if (text.length() > 10) { tagValue = GoogleBaseParser.LONG_DT_FMT.parse(text); } else { tagValue = GoogleBaseParser.SHORT_DT_FMT.parse(text); } } else if (pd.getPropertyType() == IntUnit.class || pd.getPropertyType().getComponentType() == IntUnit.class) { tagValue = new IntUnit(tag.getText()); } else if (pd.getPropertyType() == FloatUnit.class || pd.getPropertyType().getComponentType() == FloatUnit.class) { tagValue = new FloatUnit(tag.getText()); } else if (pd.getPropertyType() == DateTimeRange.class || pd.getPropertyType().getComponentType() == DateTimeRange.class) { tagValue = new DateTimeRange( LONG_DT_FMT.parse(tag.getChild("start", GoogleBaseParser.NS).getText().trim()), LONG_DT_FMT.parse(tag.getChild("end", GoogleBaseParser.NS).getText().trim())); } else if (pd.getPropertyType() == ShippingType.class || pd.getPropertyType().getComponentType() == ShippingType.class) { final FloatUnit price = new FloatUnit(tag.getChild("price", GoogleBaseParser.NS).getText().trim()); ShippingType.ServiceEnumeration service = ShippingType.ServiceEnumeration .findByValue(tag.getChild("service", GoogleBaseParser.NS).getText().trim()); if (service == null) { service = ShippingType.ServiceEnumeration.STANDARD; } final String country = tag.getChild("country", GoogleBaseParser.NS).getText().trim(); tagValue = new ShippingType(price, service, country); } else if (pd.getPropertyType() == PaymentTypeEnumeration.class || pd.getPropertyType().getComponentType() == PaymentTypeEnumeration.class) { tagValue = PaymentTypeEnumeration.findByValue(tag.getText().trim()); } else if (pd.getPropertyType() == PriceTypeEnumeration.class || pd.getPropertyType().getComponentType() == PriceTypeEnumeration.class) { tagValue = PriceTypeEnumeration.findByValue(tag.getText().trim()); } else if (pd.getPropertyType() == CurrencyEnumeration.class || pd.getPropertyType().getComponentType() == CurrencyEnumeration.class) { tagValue = CurrencyEnumeration.findByValue(tag.getText().trim()); } else if (pd.getPropertyType() == GenderEnumeration.class || pd.getPropertyType().getComponentType() == GenderEnumeration.class) { tagValue = GenderEnumeration.findByValue(tag.getText().trim()); } else if (pd.getPropertyType() == YearType.class || pd.getPropertyType().getComponentType() == YearType.class) { tagValue = new YearType(tag.getText().trim()); } else if (pd.getPropertyType() == Size.class || pd.getPropertyType().getComponentType() == Size.class) { tagValue = new Size(tag.getText().trim()); } if (!pd.getPropertyType().isArray()) { pd.getWriteMethod().invoke(module, new Object[] { tagValue }); } else { final Object[] current = (Object[]) pd.getReadMethod().invoke(module, (Object[]) null); final int newSize = current == null ? 1 : current.length + 1; final Object setValue = Array.newInstance(pd.getPropertyType().getComponentType(), newSize); int i = 0; for (; current != null && i < current.length; i++) { Array.set(setValue, i, current[i]); } Array.set(setValue, i, tagValue); pd.getWriteMethod().invoke(module, new Object[] { setValue }); } } }