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/** |
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$Id$ |
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|
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Copyright (C) Authors contributing to this file. |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util; |
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|
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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|
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/** |
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Utiltity class for parsing string values in the form of |
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HTTP request query parameters: |
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<p> |
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<code>key1=value1&key2=value2...</code> |
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|
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@author nicklas |
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@version 2.6 |
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@base.modified $Date$ |
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*/ |
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public class QueryParameters |
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{ |
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/** |
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Parses a string in HTTP query format (<code>key1=value1&key2=value2...</code>) |
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and returns it as a QueryParameters object. |
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|
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@param query The string to parse |
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@return A {@link QueryParameters} object |
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*/ |
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public static QueryParameters parseQueryString(String query) |
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{ |
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return new QueryParameters(query); |
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} |
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|
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private Map<String, List<String>> parameters; |
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|
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private QueryParameters(String query) |
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{ |
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parameters = new HashMap<String, List<String>>(); |
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if (query != null) |
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{ |
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Pattern p = Pattern.compile("([^=]+)=([^&]+)&?"); |
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Matcher m = p.matcher(query); |
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while (m.find()) |
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{ |
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String key = m.group(1); |
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String value = m.group(2); |
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List<String> values = parameters.get(key); |
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if (values == null) |
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{ |
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values = new ArrayList<String>(); |
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parameters.put(key, values); |
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} |
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values.add(value); |
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} |
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} |
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} |
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|
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/** |
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Get the (single) value for a key. If the query string contained |
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more than one value for this key, the first value is returned. |
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@param key The key |
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@return The value, or null if no value was found for the key |
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*/ |
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public String getValue(String key) |
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{ |
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List<String> values = getValues(key); |
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if (values != null && values.size() > 0) |
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{ |
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return values.get(0); |
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} |
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else |
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{ |
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return null; |
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} |
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} |
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|
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/** |
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Get all values for a key. |
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@return A list of values, or null if no value was found for the key |
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*/ |
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public List<String> getValues(String key) |
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{ |
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return parameters.get(key); |
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} |
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|
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/** |
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Get the number of values for a key. |
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@param key The key |
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@return The number of values |
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*/ |
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public int getNumValues(String key) |
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{ |
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List<String> values = getValues(key); |
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return values == null ? 0 : values.size(); |
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} |
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|
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/** |
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Get all keys that are present in the query string. |
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@return A set with the keys |
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*/ |
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public Set<String> getKeys() |
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{ |
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return parameters.keySet(); |
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} |
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|
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} |