/**
    * Copyright 2010-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.common.util.property.processor;
  
  import java.util.Properties;
  
  import org.kuali.common.util.Assert;
  import org.kuali.common.util.PropertyUtils;
  import org.kuali.common.util.log.LoggerUtils;
  import org.slf4j.Logger;
  import org.springframework.util.PropertyPlaceholderHelper;
  
  public class ResolvingProcessor implements PropertyProcessor {
  
  	private static final Logger logger = LoggerUtils.make();
  
  	public static final boolean DEFAULT_IGNORE_UNRESOLVABLE = false;
  	public static final String DEFAULT_RESOLVE_KEY = "properties.resolve";
  
  	public ResolvingProcessor() {
  		this(DEFAULT_IGNORE_UNRESOLVABLE, DEFAULT_RESOLVE_KEY);
  	}
  
  	public ResolvingProcessor(boolean ignoreUnresolvable, String resolveKey) {
  		Assert.noBlanks(resolveKey);
  		this.ignoreUnresolvable = ignoreUnresolvable;
  		this.resolveKey = resolveKey;
  		this.helper = new PropertyPlaceholderHelper("${", "}", ":", ignoreUnresolvable);
  	}
  
  	private final boolean ignoreUnresolvable;
  	private final String resolveKey;
  	private final PropertyPlaceholderHelper helper;
  
  	@Override
  	public void process(Properties properties) {
  		boolean resolve = PropertyUtils.getBoolean(resolveKey, properties, true);
  		if (resolve) {
  			logger.info("Performing placeholder resolution on {} properties", properties.size());
  			PropertyUtils.resolve(properties, helper);
  		} else {
  			logger.info("Skipping placeholder resolution for {} properties", properties.size());
  		}
  	}
  
  	public boolean isIgnoreUnresolvable() {
  		return ignoreUnresolvable;
  	}
  
  	public String getResolveKey() {
  		return resolveKey;
  	}
  
  	public PropertyPlaceholderHelper getHelper() {
  		return helper;
  	}
  
  }