QueryParameters.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.context;

import com.google.gwt.user.client.Window;

import javax.inject.Singleton;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Provides access to query parameters
 *
 * @author Dmitry Shnurenko
 * @author Sergii Leschenko
 */
@Singleton
public class QueryParameters {
    /**
     * Returns the query parameter by the specified name or empty
     * string if parameter was not found. Note that if multiple
     * parameters have been specified with the same name, the last one will be
     * returned.
     *
     * @param name
     *         name of value parameter
     * @return query parameter value
     */
    public String getByName(String name) {
        String value = Window.Location.getParameter(name);
        return value == null ? "" : value;
    }

    /**
     * Returns map containing key and value of query parameters
     * or empty map if there are no parameters.
     *
     * <p>Note that if multiple parameters have been specified
     * with the same name, the result will contains only first one.
     *
     * @return map with query parameters
     */
    public Map<String, String> getAll() {
        Map<String, String> parameters = new HashMap<>();
        for (Map.Entry<String, List<String>> parametersEntry : Window.Location.getParameterMap().entrySet()) {
            parameters.put(parametersEntry.getKey(), parametersEntry.getValue().get(0));
        }
        return parameters;
    }
}