org.sourcelab.github.client.http.HttpHeaders Maven / Gradle / Ivy

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package org.sourcelab.github.client.http;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Collection of Zero or more {@link HttpHeader} entries.
 */
public class HttpHeaders {
    private final Map headerMap;

    /**
     * Constructor.
     * @param headers Header values.
     */
    public HttpHeaders(final Collection headers) {
        Objects.requireNonNull(headers);

        final Map headerMap = new HashMap<>();
        headers.forEach((header) -> {
            Objects.requireNonNull(header.getName());
            if (headerMap.containsKey(header.getName())) {
                // NOTE: this will overwrite with last value wins... I think that is OK for now.
                //throw new IllegalArgumentException("Header '" + header.getName() + "' defined multiple times!");
            }
            headerMap.put(header.getName(), header);
        });
        this.headerMap = Collections.unmodifiableMap(headerMap);
    }

    /**
     * All header names.
     * @return All header names.
     */
    public Set getHeaderNames() {
        return headerMap.keySet()
            .stream()
            .sorted()
            .collect(Collectors.toCollection(LinkedHashSet::new));
    }

    /**
     * All header names.
     * @return All header names.
     */
    public boolean hasHeader(final String name) {
        return headerMap.containsKey(name);
    }

    /**
     * Get a header value by name.
     * @param name Name of the header to get value for.
     * @return Header's value.
     */
    public String getHeader(final String name) {
        if (!hasHeader(name)) {
            throw new IllegalArgumentException("Header '" + name + "' does not exist.");
        }
        return headerMap.get(name).getValue();
    }

    @Override
    public String toString() {
        return "HttpHeaders{"
            + headerMap
            + '}';
    }
}