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HTTP primitives for client and server

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/*
 * Copyright (c) 2022, 2023 Oracle and/or its affiliates.
 *
 * 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.helidon.http;

import java.util.ArrayList;
import java.util.List;

class HeaderValueCopy extends HeaderWritableValueBase {
    private final Header original;
    private List values;

    HeaderValueCopy(Header header) {
        super(header.headerName(), header.changing(), header.sensitive(), header.get());

        this.original = header;
    }

    @Override
    public HeaderWriteable addValue(String value) {
        if (values == null) {
            values = new ArrayList<>(original.allValues());
        }
        values.add(value);
        return this;
    }

    @Override
    public List allValues() {
        if (values == null) {
            values = new ArrayList<>(original.allValues());
        }
        return values;
    }

    @Override
    public int valueCount() {
        if (values == null) {
            values = new ArrayList<>(original.allValues());
        }
        return values.size();
    }
}