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Contains the entire NEBA core implementation, i.e. the framework that interprets the NEBA API annotations and provides implementations for the service and lifecycle callback interfaces provided in the NEBA API. This package must not export anything as its implementation details are entirely private.

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/**
 * Copyright 2013 the original author or authors.
 * 
 * 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 io.neba.core.placeholdervariables;

import io.neba.api.configuration.PlaceholderVariableResolver;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.util.PropertyPlaceholderHelper;
import org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver;
import org.springframework.util.StringValueResolver;

/**
 * Uses a {@link PlaceholderVariableResolver} as a {@link PlaceholderResolver} to enable
 * {@link PropertyPlaceholderHelper property-placeholder-style} substitution of ${variable}s.  
 * 
 * @author Olaf Otto
 * @see PropertyPlaceholderHelper
 */
public class PlaceholderVariableResolverWrapper implements StringValueResolver {
    /**
     * @author Olaf Otto
     */
    private static final class DispatchingPlaceholderResolver implements PlaceholderResolver {
        private final String resolverName;
        private final ConfigurableListableBeanFactory beanFactory;

        private DispatchingPlaceholderResolver(String resolverName, ConfigurableListableBeanFactory beanFactory) {
            this.resolverName = resolverName;
            this.beanFactory = beanFactory;
        }

        @Override
        public String resolvePlaceholder(String variableName) {
            PlaceholderVariableResolver resolver = beanFactory.getBean(resolverName, PlaceholderVariableResolver.class);
            return resolver.resolve(variableName);
        }
    }

    private final PropertyPlaceholderHelper propertyPlaceholderHelper = new PropertyPlaceholderHelper("${", "}");
    private final PlaceholderResolver resolver;
    

    public PlaceholderVariableResolverWrapper(final ConfigurableListableBeanFactory beanFactory,  final String resolverName) {
        this.resolver = new DispatchingPlaceholderResolver(resolverName, beanFactory);
    }

    @Override
    public String resolveStringValue(String strVal) {
        return this.propertyPlaceholderHelper.replacePlaceholders(strVal, this.resolver);
    }
}