Java tutorial
/* * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * This program 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. * * Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved. */ package org.pentaho.reporting.libraries.resourceloader.loader.raw; import java.net.URL; import java.util.HashMap; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.pentaho.reporting.libraries.resourceloader.ResourceData; import org.pentaho.reporting.libraries.resourceloader.ResourceException; import org.pentaho.reporting.libraries.resourceloader.ResourceKey; import org.pentaho.reporting.libraries.resourceloader.ResourceKeyCreationException; import org.pentaho.reporting.libraries.resourceloader.ResourceKeyData; import org.pentaho.reporting.libraries.resourceloader.ResourceKeyUtils; import org.pentaho.reporting.libraries.resourceloader.ResourceLoader; import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException; /** * Creation-Date: 12.04.2006, 15:19:03 * * @author Thomas Morgner */ public class RawResourceLoader implements ResourceLoader { public static final String SCHEMA_NAME = RawResourceLoader.class.getName(); public RawResourceLoader() { } /** * Checks, whether this resource loader implementation was responsible for * creating this key. * * @param key * @return */ public boolean isSupportedKey(final ResourceKey key) { if (SCHEMA_NAME.equals(key.getSchema())) { return true; } return false; } /** * Creates a new resource key from the given object and the factory keys. * * @param value * @param factoryKeys * @return the created key. * @throws org.pentaho.reporting.libraries.resourceloader.ResourceKeyCreationException * if creating the key failed. */ public ResourceKey createKey(final Object value, final Map factoryKeys) throws ResourceKeyCreationException { if (value instanceof byte[] == false) { return null; } return new ResourceKey(SCHEMA_NAME, value, factoryKeys); } /** * Derives a new resource key from the given key. If neither a path nor new * factory-keys are given, the parent key is returned. * * @param parent the parent * @param path the derived path (can be null). * @param factoryKeys the optional factory keys (can be null). * @return the derived key. * @throws org.pentaho.reporting.libraries.resourceloader.ResourceKeyCreationException * if the key cannot be derived for any reason. */ public ResourceKey deriveKey(final ResourceKey parent, final String path, final Map factoryKeys) throws ResourceKeyCreationException { if (path != null) { throw new ResourceKeyCreationException("Unable to derive key for new path."); } if (isSupportedKey(parent) == false) { throw new ResourceKeyCreationException("Assertation: Unsupported parent key type"); } if (factoryKeys == null) { return parent; } final HashMap map = new HashMap(); map.putAll(parent.getFactoryParameters()); map.putAll(factoryKeys); return new ResourceKey(parent.getSchema(), parent.getIdentifier(), map); } public URL toURL(final ResourceKey key) { // not supported .. return null; } public ResourceData load(final ResourceKey key) throws ResourceLoadingException { if (isSupportedKey(key) == false) { throw new ResourceLoadingException("The key type is not supported."); } return new RawResourceData(key); } /** * Creates a String version of the resource key that can be used to generate a new ResourceKey * object via deserialization * @param bundleKey * @param key */ public String serialize(final ResourceKey bundleKey, final ResourceKey key) throws ResourceException { // Validate the parameter if (key == null) { throw new NullPointerException("The ResourceKey can not be null"); } if (isSupportedKey(key) == false) { throw new IllegalArgumentException("Key format is not recognized."); } if (!(key.getIdentifier() instanceof byte[])) { throw new IllegalArgumentException("ResourceKey is invalid - identifier is not a byte[] object"); } final byte[] data = (byte[]) key.getIdentifier(); final char[] cdata = new char[data.length]; for (int i = 0; i < data.length; i++) { cdata[i] = (char) (data[i] & 0xFF); } return ResourceKeyUtils.createStringResourceKey(String.valueOf(key.getSchema()), new String(cdata), key.getFactoryParameters()); } /** * Parses the input string and returns a newly created ResourceKey based on the string data */ public ResourceKey deserialize(final ResourceKey bundleKey, String stringKey) throws ResourceKeyCreationException { // Parse the data final ResourceKeyData keyData = ResourceKeyUtils.parse(stringKey); // Validate the data if (SCHEMA_NAME.equals(keyData.getSchema()) == false) { throw new ResourceKeyCreationException("Serialized version of key does not contain correct schema"); } final String identifier = keyData.getIdentifier(); final char[] chars = identifier.toCharArray(); final byte[] data = new byte[chars.length]; for (int i = 0; i < chars.length; i++) { data[i] = (byte) chars[i]; } return createKey(data, keyData.getFactoryParameters()); } public boolean isSupportedDeserializer(String data) { return SCHEMA_NAME.equals(ResourceKeyUtils.readSchemaFromString(data)); } }