net.shibboleth.ext.spring.config.StringBooleanToPredicateConverter Maven / Gradle / Ivy

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/*
 * Licensed to the University Corporation for Advanced Internet Development,
 * Inc. (UCAID) under one or more contributor license agreements.  See the
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID licenses this file to You 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 net.shibboleth.ext.spring.config;

import java.util.function.Predicate;

import javax.annotation.Nonnull;

import net.shibboleth.utilities.java.support.primitive.StringSupport;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.convert.converter.Converter;

import com.google.common.base.Predicates;

/**
 * Allows setting of fixed {@link Predicate} properties using a boolean string.
 */
public class StringBooleanToPredicateConverter implements Converter> {

    /** Logger. */
    @Nonnull private final Logger log = LoggerFactory.getLogger(StringBooleanToPredicateConverter.class);

    /** {@inheritDoc} */
    public Predicate convert(final String source) {
        
        final String trimmed = StringSupport.trimOrNull(source);
        if (Boolean.valueOf(trimmed)) {
            return Predicates.alwaysTrue();
        }
        
        if (trimmed != null) {
            if ("1".equals(trimmed)) {
                log.warn("The value '1' is not treated as 'true'; if intentional, explicitly use 'false'");
            } else if (!"false".equalsIgnoreCase(trimmed) && !"0".equals(trimmed)) {
                log.warn("Unrecognized value '{}' converted to false; if intentional, explicitly use 'false'", trimmed);
            }
        }
        return Predicates.alwaysFalse();
    }
    
}