/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package frame.upload;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* A simple parser intended to parse sequences of name/value pairs.
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* Parameter values are exptected to be enclosed in quotes if they
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* contain unsafe characters, such as '=' characters or separators.
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* Parameter values are optional and can be omitted.
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*
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* <p>
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* <code>param1 = value; param2 = "anything goes; really"; param3</code>
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* </p>
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*
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* @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
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*/
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public class ParameterParser {
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/**
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* String to be parsed.
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*/
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private char[] chars = null;
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/**
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* Current position in the String.
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*/
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private int pos = 0;
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/**
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* Maximum position in the String.
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*/
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private int len = 0;
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/**
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* Start of a token.
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*/
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private int i1 = 0;
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/**
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* End of a token.
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*/
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private int i2 = 0;
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/**
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* Whether names stored in the map should be converted to lower case.
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*/
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private boolean lowerCaseNames = false;
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/**
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* Default ParameterParser constructor.
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*/
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public ParameterParser() {
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super();
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}
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/**
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* Are there any characters left to parse?
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*
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* @return <tt>true</tt> if there are unparsed characters,
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* <tt>false</tt> otherwise.
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*/
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private boolean hasChar() {
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return this.pos < this.len;
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}
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/**
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* A helper method to process the parsed token. This method removes
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* leading and trailing blanks as well as enclosing quotation marks,
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* when necessary.
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*
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* @param quoted <tt>true</tt> if quotation marks are expected,
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* <tt>false</tt> otherwise.
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* @return the token
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*/
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private String getToken(boolean quoted) {
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// Trim leading white spaces
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while ((i1 < i2) && (Character.isWhitespace(chars[i1]))) {
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i1++;
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}
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// Trim trailing white spaces
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while ((i2 > i1) && (Character.isWhitespace(chars[i2 - 1]))) {
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i2--;
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}
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// Strip away quotation marks if necessary
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if (quoted) {
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if (((i2 - i1) >= 2)
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&& (chars[i1] == '"')
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&& (chars[i2 - 1] == '"')) {
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i1++;
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i2--;
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}
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}
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String result = null;
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if (i2 > i1) {
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result = new String(chars, i1, i2 - i1);
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}
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return result;
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}
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/**
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* Tests if the given character is present in the array of characters.
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*
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* @param ch the character to test for presense in the array of characters
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* @param charray the array of characters to test against
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*
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* @return <tt>true</tt> if the character is present in the array of
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* characters, <tt>false</tt> otherwise.
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*/
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private boolean isOneOf(char ch, final char[] charray) {
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boolean result = false;
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for (int i = 0; i < charray.length; i++) {
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if (ch == charray[i]) {
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result = true;
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break;
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}
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}
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return result;
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}
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/**
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* Parses out a token until any of the given terminators
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* is encountered.
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*
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* @param terminators the array of terminating characters. Any of these
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* characters when encountered signify the end of the token
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*
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* @return the token
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*/
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private String parseToken(final char[] terminators) {
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char ch;
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i1 = pos;
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i2 = pos;
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while (hasChar()) {
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ch = chars[pos];
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if (isOneOf(ch, terminators)) {
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break;
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}
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i2++;
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pos++;
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}
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return getToken(false);
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}
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/**
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* Parses out a token until any of the given terminators
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* is encountered outside the quotation marks.
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*
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* @param terminators the array of terminating characters. Any of these
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* characters when encountered outside the quotation marks signify the end
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* of the token
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*
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* @return the token
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*/
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private String parseQuotedToken(final char[] terminators) {
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char ch;
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i1 = pos;
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i2 = pos;
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boolean quoted = false;
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boolean charEscaped = false;
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while (hasChar()) {
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ch = chars[pos];
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if (!quoted && isOneOf(ch, terminators)) {
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break;
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}
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if (!charEscaped && ch == '"') {
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quoted = !quoted;
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}
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charEscaped = (!charEscaped && ch == '\\');
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i2++;
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pos++;
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}
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return getToken(true);
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}
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/**
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* Returns <tt>true</tt> if parameter names are to be converted to lower
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* case when name/value pairs are parsed.
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*
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* @return <tt>true</tt> if parameter names are to be
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* converted to lower case when name/value pairs are parsed.
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* Otherwise returns <tt>false</tt>
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*/
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public boolean isLowerCaseNames() {
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return this.lowerCaseNames;
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}
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/**
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* Sets the flag if parameter names are to be converted to lower case when
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* name/value pairs are parsed.
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*
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* @param b <tt>true</tt> if parameter names are to be
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* converted to lower case when name/value pairs are parsed.
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* <tt>false</tt> otherwise.
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*/
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public void setLowerCaseNames(boolean b) {
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this.lowerCaseNames = b;
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}
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/**
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* Extracts a map of name/value pairs from the given String. Names are
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* expected to be unique. Multiple separators may be specified and
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* the earliest found in the input String is used.
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*
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* @param str the String that contains a sequence of name/value pairs
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* @param separators the name/value pairs separators
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*
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* @return a map of name/value pairs
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*/
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public Map parse(final String str, char[] separators) {
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if (separators == null || separators.length == 0) {
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return new HashMap();
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}
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char separator = separators[0];
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if (str != null) {
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int idx = str.length();
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for (int i = 0; i < separators.length; i++) {
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int tmp = str.indexOf(separators[i]);
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if (tmp != -1) {
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if (tmp < idx) {
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idx = tmp;
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separator = separators[i];
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}
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}
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}
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}
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return parse(str, separator);
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}
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/**
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* Extracts a map of name/value pairs from the given String. Names are
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* expected to be unique.
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*
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* @param str the String that contains a sequence of name/value pairs
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* @param separator the name/value pairs separator
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*
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* @return a map of name/value pairs
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*/
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public Map parse(final String str, char separator) {
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if (str == null) {
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return new HashMap();
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}
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return parse(str.toCharArray(), separator);
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}
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/**
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* Extracts a map of name/value pairs from the given array of
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* characters. Names are expected to be unique.
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*
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* @param chars the array of characters that contains a sequence of
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* name/value pairs
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* @param separator the name/value pairs separator
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*
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* @return a map of name/value pairs
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*/
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public Map parse(final char[] chars, char separator) {
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if (chars == null) {
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return new HashMap();
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}
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return parse(chars, 0, chars.length, separator);
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}
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/**
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* Extracts a map of name/value pairs from the given array of
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* characters. Names are expected to be unique.
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*
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* @param chars the array of characters that contains a sequence of
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* name/value pairs
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* @param offset - the initial offset.
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* @param length - the length.
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* @param separator the name/value pairs separator
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*
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* @return a map of name/value pairs
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*/
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public Map parse(
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final char[] chars,
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int offset,
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int length,
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char separator) {
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if (chars == null) {
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return new HashMap();
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}
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HashMap params = new HashMap();
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this.chars = chars;
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this.pos = offset;
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this.len = length;
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String paramName = null;
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String paramValue = null;
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while (hasChar()) {
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paramName = parseToken(new char[] {
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'=', separator });
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paramValue = null;
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if (hasChar() && (chars[pos] == '=')) {
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pos++; // skip '='
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paramValue = parseQuotedToken(new char[] {
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separator });
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}
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if (hasChar() && (chars[pos] == separator)) {
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pos++; // skip separator
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}
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if ((paramName != null) && (paramName.length() > 0)) {
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if (this.lowerCaseNames) {
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paramName = paramName.toLowerCase();
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}
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params.put(paramName, paramValue);
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}
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}
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return params;
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}
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}
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