001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.progmodel.facets.object.parseable;
021
022import com.google.common.base.Strings;
023
024import org.apache.isis.applib.adapters.Parser;
025import org.apache.isis.core.commons.config.IsisConfiguration;
026import org.apache.isis.core.commons.lang.ClassUtil;
027import org.apache.isis.core.commons.lang.StringExtensions;
028import org.apache.isis.core.metamodel.facetapi.FacetHolder;
029
030public final class ParserUtil {
031
032    private ParserUtil() {
033    }
034
035    public static final String PARSER_NAME_KEY_PREFIX = "isis.reflector.java.facets.parser.";
036    public static final String PARSER_NAME_KEY_SUFFIX = ".parserName";
037
038    static String parserNameFromConfiguration(final Class<?> type, final IsisConfiguration configuration) {
039        final String key = PARSER_NAME_KEY_PREFIX + type.getCanonicalName() + PARSER_NAME_KEY_SUFFIX;
040        final String parserName = configuration.getString(key);
041        return !Strings.isNullOrEmpty(parserName) ? parserName : null;
042    }
043
044    @SuppressWarnings("unchecked")
045    public static Class<? extends Parser<?>> parserOrNull(final Class<?> candidateClass, final String classCandidateName) {
046        @SuppressWarnings("rawtypes")
047        final Class type = candidateClass != null ? ClassUtil.implementingClassOrNull(candidateClass.getName(), Parser.class, FacetHolder.class) : null;
048        return type != null ? type : ClassUtil.implementingClassOrNull(classCandidateName, Parser.class, FacetHolder.class);
049    }
050
051}