/*
    * Copyright 2002-2012 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 org.springframework.mock.web.test;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  import org.springframework.util.Assert;
  import org.springframework.util.CollectionUtils;
  
  /**
   * Internal helper class that serves as value holder for request headers.
   *
   * @author Juergen Hoeller
   * @author Rick Evans
   * @since 2.0.1
   */
  class HeaderValueHolder {
  
  	private final List<Object> values = new LinkedList<Object>();
  
  
  	public void setValue(Object value) {
  		this.values.clear();
  		this.values.add(value);
  	}
  
  	public void addValue(Object value) {
  		this.values.add(value);
  	}
  
  	public void addValues(Collection<?> values) {
  		this.values.addAll(values);
  	}
  
  	public void addValueArray(Object values) {
  		CollectionUtils.mergeArrayIntoCollection(values, this.values);
  	}
  
  	public List<Object> getValues() {
  		return Collections.unmodifiableList(this.values);
  	}
  
  	public List<String> getStringValues() {
  		List<String> stringList = new ArrayList<String>(this.values.size());
  		for (Object value : this.values) {
  			stringList.add(value.toString());
  		}
  		return Collections.unmodifiableList(stringList);
  	}
  
  	public Object getValue() {
  		return (!this.values.isEmpty() ? this.values.get(0) : null);
  	}
  
  	public String getStringValue() {
  		return (!this.values.isEmpty() ? this.values.get(0).toString() : null);
  	}
  
  
  	/**
  	 * Find a HeaderValueHolder by name, ignoring casing.
  	 * @param headers the Map of header names to HeaderValueHolders
  	 * @param name the name of the desired header
  	 * @return the corresponding HeaderValueHolder,
  	 * or {@code null} if none found
  	 */
  	public static HeaderValueHolder getByName(Map<String, HeaderValueHolder> headers, String name) {
  		Assert.notNull(name, "Header name must not be null");
  		for (String headerName : headers.keySet()) {
  			if (headerName.equalsIgnoreCase(name)) {
  				return headers.get(headerName);
  			}
  		}
  		return null;
  	}
  
  }