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/**
 * Copyright 2018 jianggujin (www.jianggujin.com).
 * 
 * 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 com.jianggujin.http.util;

import java.io.InputStream;

/**
 * 键值对
 * 
 * @author jianggujin
 *
 */
public class JKeyVal {
    /**
     * 键
     */
    private String key;
    /**
     * 值
     */
    private String value;
    /**
     * 输入流
     */
    private InputStream stream;

    /**
     * 创建键值对
     * 
     * @param key   健
     * @param value 值
     * @return keyvalue
     */
    public static JKeyVal create(String key, String value) {
        return new JKeyVal().key(key).value(value);
    }

    /**
     * 创建键值对
     * 
     * @param key      健
     * @param filename 文件名
     * @param stream   文件输入流
     * @return keyvalue
     */
    public static JKeyVal create(String key, String filename, InputStream stream) {
        return new JKeyVal().key(key).value(filename).inputStream(stream);
    }

    private JKeyVal() {
    }

    /**
     * 设置键
     * 
     * @param key 健
     * @return keyvalue
     */
    public JKeyVal key(String key) {
        if (JDataUtils.isEmpty(key)) {
            throw new IllegalArgumentException("Data key must not be empty");
        }
        this.key = key;
        return this;
    }

    /**
     * 获得键
     * 
     * @return key
     */
    public String key() {
        return key;
    }

    /**
     * 设置值
     * 
     * @param value 值
     * @return keyvalue
     */
    public JKeyVal value(String value) {
        // if (value == null) {
        // throw new IllegalArgumentException("Data value must not be null");
        // }
        this.value = value;
        return this;
    }

    /**
     * 获得值
     * 
     * @return value
     */
    public String value() {
        return value;
    }

    /**
     * 设置输入流
     * 
     * @param in
     * @return
     */
    public JKeyVal inputStream(InputStream in) {
        if (in == null) {
            throw new IllegalArgumentException("Data input stream must not be null");
        }
        this.stream = in;
        return this;
    }

    /**
     * 获得输入流
     * 
     * @return
     */
    public InputStream inputStream() {
        return stream;
    }

    /**
     * 判断是否有输入流
     * 
     * @return
     */
    public boolean hasInputStream() {
        return stream != null;
    }

    @Override
    public String toString() {
        return key + "=" + value;
    }
}