ResourceClassUtil.java

/*
 * Copyright 2010 Outerthought bvba
 *
 * 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.lilyproject.rest;

import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.UriInfo;
import java.util.ArrayList;
import java.util.List;

import org.lilyproject.repository.api.QName;
import org.lilyproject.tools.import_.json.WriteOptions;

import static javax.ws.rs.core.Response.Status.BAD_REQUEST;

public class ResourceClassUtil {
    private ResourceClassUtil() {
    }

    public static QName parseQName(String name, MultivaluedMap<String, String> queryParams) {
        if (name.startsWith("{")) {
            return QName.fromString(name);
        }

        int pos = name.indexOf('$');
        if (pos == -1) {
            throw new ResourceException("Invalid qualified name: " + name, BAD_REQUEST.getStatusCode());
        }

        String prefix = name.substring(0, pos);
        String localName = name.substring(pos + 1);

        String uri = queryParams.getFirst("ns." + prefix);
        if (uri == null) {
            throw new ResourceException("Undefined prefix in qualified name: " + name, BAD_REQUEST.getStatusCode());
        }

        return new QName(uri, localName);
    }

    public static List<QName> parseFieldList(UriInfo uriInfo) {
        String fields = uriInfo.getQueryParameters().getFirst("fields");
        List<QName> fieldQNames = null;
        if (fields != null) {
            fieldQNames = new ArrayList<QName>();
            String[] fieldParts = fields.split(",");
            for (String field : fieldParts) {
                field = field.trim();
                if (field.length() == 0) {
                    continue;
                }

                fieldQNames.add(ResourceClassUtil.parseQName(field, uriInfo.getQueryParameters()));
            }
        }
        return fieldQNames;
    }

    public static Integer getIntegerParam(UriInfo uriInfo, String name, Integer defaultValue) {
        String value = uriInfo.getQueryParameters().getFirst(name);
        if (value == null) {
            return defaultValue;
        }

        try {
            return Integer.parseInt(value);
        } catch (NumberFormatException e) {
            throw new ResourceException("Request parameter '" + name + "' does not contain an integer: '" + value +
                    "'.", BAD_REQUEST.getStatusCode());
        }
    }

    public static int[] getIntegerArrayParam(UriInfo uriInfo, String name, int[] defaultValue) {
        String value = uriInfo.getQueryParameters().getFirst(name);
        if (value == null) {
            return defaultValue;
        }
        String[] values = value.split(",");
        int[] integers = new int[values.length];
        try {
            for (int i = 0; i < values.length; i++) {
                integers[i] = Integer.parseInt(values[i]);
            }
        } catch (NumberFormatException e) {
            throw new ResourceException("Request parameter '" + name
                    + "' does not contain a comma separated list of integers: '" + value + "'.",
                    BAD_REQUEST.getStatusCode());
        }
        return integers;
    }

    public static WriteOptions getWriteOptions(UriInfo uriInfo) {
        WriteOptions options = new WriteOptions();

        String includeSchema = uriInfo.getQueryParameters().getFirst("schema");
        if (includeSchema != null) {
            options.setIncludeSchema(includeSchema.equalsIgnoreCase("true"));
        }

        String useNamespacePrefixes = uriInfo.getQueryParameters().getFirst("nsprefixes");
        if (useNamespacePrefixes != null) {
            options.setUseNamespacePrefixes(useNamespacePrefixes.equalsIgnoreCase("true"));
        }

        return options;
    }
}