org.commonjava.aprox.util.AcceptInfoParser.java Source code

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Here is the source code for org.commonjava.aprox.util.AcceptInfoParser.java

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/**
 * Copyright (C) 2011 Red Hat, Inc. (jdcasey@commonjava.org)
 *
 * 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.commonjava.aprox.util;

import static org.apache.commons.lang.StringUtils.join;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AcceptInfoParser {

    public static final String APP_ID = "aprox";

    public static final String DEFAULT_VERSION = "v1";

    public List<AcceptInfo> parse(final String... accepts) {
        return parse(Arrays.asList(accepts));
    }

    public List<AcceptInfo> parse(final Collection<String> accepts) {
        final Logger logger = LoggerFactory.getLogger(AcceptInfo.class);

        final List<String> raw = new ArrayList<String>();
        for (final String accept : accepts) {
            final String[] parts = accept.split("\\s*,\\s*");
            if (parts.length == 1) {
                logger.info("adding atomic accept header: '{}'", accept);
                raw.add(accept);
            } else {
                logger.info("Adding split header values: '{}'", join(parts, "', '"));
                raw.addAll(Arrays.asList(parts));
            }
        }

        logger.info("Got raw ACCEPT header values:\n  {}", join(raw, "\n  "));

        if (raw == null || raw.isEmpty()) {
            return Collections
                    .singletonList(new AcceptInfo(AcceptInfo.ACCEPT_ANY, AcceptInfo.ACCEPT_ANY, DEFAULT_VERSION));
        }

        final List<AcceptInfo> acceptInfos = new ArrayList<AcceptInfo>();
        for (final String r : raw) {
            String cleaned = r.toLowerCase();
            final int qIdx = cleaned.indexOf(';');
            if (qIdx > -1) {
                // FIXME: We shouldn't discard quality suffix...
                cleaned = cleaned.substring(0, qIdx);
            }

            logger.info("Cleaned up: {} to: {}", r, cleaned);

            final String appPrefix = "application/" + APP_ID + "-";

            logger.info(
                    "Checking for ACCEPT header starting with: '{}' and containing: '+' (header value is: '{}')",
                    appPrefix, cleaned);
            if (cleaned.startsWith(appPrefix) && cleaned.contains("+")) {
                final String[] acceptParts = cleaned.substring(appPrefix.length()).split("\\+");

                acceptInfos.add(new AcceptInfo(cleaned, "application/" + acceptParts[1], acceptParts[0]));
            } else {
                acceptInfos.add(new AcceptInfo(cleaned, cleaned, DEFAULT_VERSION));
            }
        }

        return acceptInfos;
    }

    public List<AcceptInfo> parse(final Enumeration<String> accepts) {
        return parse(Collections.list(accepts));
    }

    public String getDefaultVersion() {
        return DEFAULT_VERSION;
    }

}