| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.asyncweb.client.util; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class ParameterParser { |
| |
| /** |
| * String to be parsed |
| */ |
| private char[] chars = null; |
| |
| /** |
| * Current position in the string |
| */ |
| private int pos = 0; |
| |
| /** |
| * Maximum position in the string |
| */ |
| private int len = 0; |
| |
| /** |
| * Start of a token |
| */ |
| private int i1 = 0; |
| |
| /** |
| * End of a token |
| */ |
| private int i2 = 0; |
| |
| /** |
| * Default ParameterParser constructor |
| */ |
| public ParameterParser() { |
| super(); |
| } |
| |
| |
| /** |
| * Are there any characters left to parse? |
| */ |
| private boolean hasChar() { |
| return this.pos < this.len; |
| } |
| |
| |
| /** |
| * A helper method to process the parsed token. |
| */ |
| private String getToken(boolean quoted) { |
| // Trim leading white spaces |
| while ((i1 < i2) && (Character.isWhitespace(chars[i1]))) { |
| i1++; |
| } |
| // Trim trailing white spaces |
| while ((i2 > i1) && (Character.isWhitespace(chars[i2 - 1]))) { |
| i2--; |
| } |
| // Strip away quotes if necessary |
| if (quoted) { |
| if (((i2 - i1) >= 2) |
| && (chars[i1] == '"') |
| && (chars[i2 - 1] == '"')) { |
| i1++; |
| i2--; |
| } |
| } |
| String result = null; |
| if (i2 >= i1) { |
| result = new String(chars, i1, i2 - i1); |
| } |
| return result; |
| } |
| |
| |
| /** |
| * Is given character present in the array of characters? |
| */ |
| private boolean isOneOf(char ch, char[] charray) { |
| boolean result = false; |
| for (int i = 0; i < charray.length; i++) { |
| if (ch == charray[i]) { |
| result = true; |
| break; |
| } |
| } |
| return result; |
| } |
| |
| |
| /** |
| * Parse out a token until any of the given terminators |
| * is encountered. |
| */ |
| private String parseToken(final char[] terminators) { |
| char ch; |
| i1 = pos; |
| i2 = pos; |
| while (hasChar()) { |
| ch = chars[pos]; |
| if (isOneOf(ch, terminators)) { |
| break; |
| } |
| i2++; |
| pos++; |
| } |
| return getToken(false); |
| } |
| |
| |
| /** |
| * Parse out a token until any of the given terminators |
| * is encountered. Special characters in quoted tokens |
| * are escaped. |
| */ |
| private String parseQuotedToken(final char[] terminators) { |
| char ch; |
| i1 = pos; |
| i2 = pos; |
| boolean quoted = false; |
| boolean charEscaped = false; |
| while (hasChar()) { |
| ch = chars[pos]; |
| if (!quoted && isOneOf(ch, terminators)) { |
| break; |
| } |
| if (!charEscaped && ch == '"') { |
| quoted = !quoted; |
| } |
| charEscaped = (!charEscaped && ch == '\\'); |
| i2++; |
| pos++; |
| |
| } |
| return getToken(true); |
| } |
| |
| /** |
| * Extracts a list of {@link NameValuePair}s from the given string. |
| * |
| * @param str the string that contains a sequence of name/value pairs |
| * @return a list of {@link NameValuePair}s |
| */ |
| public List parse(final String str, char separator) { |
| |
| if (str == null) { |
| return new ArrayList(); |
| } |
| return parse(str.toCharArray(), separator); |
| } |
| |
| /** |
| * Extracts a list of {@link NameValuePair}s from the given array of |
| * characters. |
| * |
| * @param chars the array of characters that contains a sequence of |
| * name/value pairs |
| * @return a list of {@link NameValuePair}s |
| */ |
| public List parse(final char[] chars, char separator) { |
| |
| if (chars == null) { |
| return new ArrayList(); |
| } |
| return parse(chars, 0, chars.length, separator); |
| } |
| |
| |
| /** |
| * Extracts a list of {@link NameValuePair}s from the given array of |
| * characters. |
| * |
| * @param chars the array of characters that contains a sequence of |
| * name/value pairs |
| * @param offset - the initial offset. |
| * @param length - the length. |
| * @return a list of {@link NameValuePair}s |
| */ |
| public List parse(final char[] chars, int offset, int length, char separator) { |
| |
| if (chars == null) { |
| return new ArrayList(); |
| } |
| List params = new ArrayList(); |
| this.chars = chars; |
| this.pos = offset; |
| this.len = length; |
| |
| String paramName = null; |
| String paramValue = null; |
| while (hasChar()) { |
| paramName = parseToken(new char[] {'=', separator}); |
| paramValue = null; |
| if (hasChar() && (chars[pos] == '=')) { |
| pos++; // skip '=' |
| paramValue = parseQuotedToken(new char[] {separator}); |
| } |
| if (hasChar() && (chars[pos] == separator)) { |
| pos++; // skip separator |
| } |
| if (paramName != null && !(paramName.equals("") && paramValue == null)) { |
| params.add(new NameValuePair(paramName, paramValue)); |
| } |
| } |
| return params; |
| } |
| } |