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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.http;

import com.google.common.base.Function;

public class CaseInsensitiveKey {

    private final String key;

    /** Cache the hash code for the key */
    private int hash; // Default to 0

    public CaseInsensitiveKey(String key) {
        this.key = key;
    }

    public static CaseInsensitiveKey from(String key) {
        return new CaseInsensitiveKey(key);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        CaseInsensitiveKey that = (CaseInsensitiveKey) o;

        if (key != null ? !key.equalsIgnoreCase(that.key) : that.key != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int h = hash;
        if (h == 0 && key.length() > 0) {
            for (int i = 0; i < key.length(); i++) {
                char c = Character.toLowerCase(key.charAt(i));
                h = 31 * h + c;
            }
            hash = h;
        }
        return h;
    }

    @Override
    public String toString() {
        return key;
    }

    public String value() {
        return key;
    }

    public static final Function TO_CASE_INSENSITIVE_KEYS = new Function() {
        public CaseInsensitiveKey apply(String input) {
            return from(input);
        }
    };
}