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Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/impl/LDAPFilter.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/impl/LDAPFilter.java | 1373 |
1 files changed, 1373 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/impl/LDAPFilter.java b/sca-java-2.x/tags/2.0.1-RC1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/impl/LDAPFilter.java new file mode 100644 index 0000000000..8d3630baa4 --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/impl/LDAPFilter.java @@ -0,0 +1,1373 @@ +/* + * Copyright (c) OSGi Alliance (2005, 2009). All Rights Reserved. + * + * 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.apache.tuscany.sca.extensibility.impl; + +import java.lang.reflect.AccessibleObject; +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Dictionary; +import java.util.Enumeration; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Properties; + +import org.apache.tuscany.sca.extensibility.ServiceDeclaration; + + +/** + * This code is derived from <a href="http://svn.apache.org/repos/asf/felix/releases/org.osgi.core-1.4.0/src/main/java/org/osgi/framework/FrameworkUtil.java">FrameworkUtil</a> + * <p> + * RFC 1960-based Filter. Filter objects can be created by calling the + * constructor with the desired filter string. A Filter object can be called + * numerous times to determine if the match argument matches the filter + * string that was used to create the Filter object. + * + * <p> + * The syntax of a filter string is the string representation of LDAP search + * filters as defined in RFC 1960: <i>A String Representation of LDAP Search + * Filters</i> (available at http://www.ietf.org/rfc/rfc1960.txt). It should + * be noted that RFC 2254: <i>A String Representation of LDAP Search + * Filters</i> (available at http://www.ietf.org/rfc/rfc2254.txt) supersedes + * RFC 1960 but only adds extensible matching and is not applicable for this + * API. + * + * <p> + * The string representation of an LDAP search filter is defined by the + * following grammar. It uses a prefix format. + * + * <pre> + * <filter> ::= '(' <filtercomp> ')' + * <filtercomp> ::= <and> | <or> | <not> | <item> + * <and> ::= '&' <filterlist> + * <or> ::= '|' <filterlist> + * <not> ::= '!' <filter> + * <filterlist> ::= <filter> | <filter> <filterlist> + * <item> ::= <simple> | <present> | <substring> + * <simple> ::= <attr> <filtertype> <value> + * <filtertype> ::= <equal> | <approx> | <greater> | <less> + * <equal> ::= '=' + * <approx> ::= '˜=' + * <greater> ::= '>=' + * <less> ::= '<=' + * <present> ::= <attr> '=*' + * <substring> ::= <attr> '=' <initial> <any> <final> + * <initial> ::= NULL | <value> + * <any> ::= '*' <starval> + * <starval> ::= NULL | <value> '*' <starval> + * <final> ::= NULL | <value> + * </pre> + * + * <code><attr></code> is a string representing an attribute, or key, + * in the properties objects of the registered services. Attribute names are + * not case sensitive; that is cn and CN both refer to the same attribute. + * <code><value></code> is a string representing the value, or part of + * one, of a key in the properties objects of the registered services. If a + * <code><value></code> must contain one of the characters ' + * <code>*</code>' or '<code>(</code>' or '<code>)</code>', these characters + * should be escaped by preceding them with the backslash '<code>\</code>' + * character. Note that although both the <code><substring></code> and + * <code><present></code> productions can produce the <code>'attr=*'</code> + * construct, this construct is used only to denote a presence filter. + * + * <p> + * Examples of LDAP filters are: + * + * <pre> + * "(cn=Babs Jensen)" + * "(!(cn=Tim Howes))" + * "(&(" + Constants.OBJECTCLASS + "=Person)(|(sn=Jensen)(cn=Babs J*)))" + * "(o=univ*of*mich*)" + * </pre> + * + * <p> + * The approximate match (<code>~=</code>) is implementation specific but + * should at least ignore case and white space differences. Optional are + * codes like soundex or other smart "closeness" comparisons. + * + * <p> + * Comparison of values is not straightforward. Strings are compared + * differently than numbers and it is possible for a key to have multiple + * values. Note that that keys in the match argument must always be strings. + * The comparison is defined by the object type of the key's value. The + * following rules apply for comparison: + * + * <blockquote> + * <TABLE BORDER=0> + * <TR> + * <TD><b>Property Value Type </b></TD> + * <TD><b>Comparison Type</b></TD> + * </TR> + * <TR> + * <TD>String</TD> + * <TD>String comparison</TD> + * </TR> + * <TR valign=top> + * <TD>Integer, Long, Float, Double, Byte, Short, BigInteger, BigDecimal</TD> + * <TD>numerical comparison</TD> + * </TR> + * <TR> + * <TD>Character</TD> + * <TD>character comparison</TD> + * </TR> + * <TR> + * <TD>Boolean</TD> + * <TD>equality comparisons only</TD> + * </TR> + * <TR> + * <TD>[] (array)</TD> + * <TD>recursively applied to values</TD> + * </TR> + * <TR> + * <TD>Collection</TD> + * <TD>recursively applied to values</TD> + * </TR> + * </TABLE> + * Note: arrays of primitives are also supported. </blockquote> + * + * A filter matches a key that has multiple values if it matches at least + * one of those values. For example, + * + * <pre> + * Dictionary d = new Hashtable(); + * d.put("cn", new String[] {"a", "b", "c"}); + * </pre> + * + * d will match <code>(cn=a)</code> and also <code>(cn=b)</code> + * + * <p> + * A filter component that references a key having an unrecognizable data + * type will evaluate to <code>false</code> . + */ +public class LDAPFilter { + /* filter operators */ + private static final int EQUAL = 1; + private static final int APPROX = 2; + private static final int GREATER = 3; + private static final int LESS = 4; + private static final int PRESENT = 5; + private static final int SUBSTRING = 6; + private static final int AND = 7; + private static final int OR = 8; + private static final int NOT = 9; + + /** filter operation */ + private final int op; + /** filter attribute or null if operation AND, OR or NOT */ + private final String attr; + /** filter operands */ + private final Object value; + + /* normalized filter string for Filter object */ + private transient volatile String filterString; + + /** + * Constructs a {@link LDAPFilter} object. This filter object may be + * used to match a {@link ServiceReference} or a Dictionary. + * + * <p> + * If the filter cannot be parsed, an {@link InvalidSyntaxException} + * will be thrown with a human readable message where the filter became + * unparsable. + * + * @param filterString the filter string. + * @exception InvalidSyntaxException If the filter parameter contains an + * invalid filter string that cannot be parsed. + */ + public static LDAPFilter newInstance(String filterString) throws InvalidSyntaxException { + return new Parser(filterString).parse(); + } + + LDAPFilter(int operation, String attr, Object value) { + this.op = operation; + this.attr = attr; + this.value = value; + } + + /** + * Filter using a <code>Dictionary</code>. This <code>Filter</code> is + * executed using the specified <code>Dictionary</code>'s keys and + * values. The keys are case insensitively matched with this + * <code>Filter</code>. + * + * @param dictionary The <code>Dictionary</code> whose keys are used in + * the match. + * @return <code>true</code> if the <code>Dictionary</code>'s keys and + * values match this filter; <code>false</code> otherwise. + * @throws IllegalArgumentException If <code>dictionary</code> contains + * case variants of the same key name. + */ + public boolean match(Dictionary dictionary) { + return match0(new CaseInsensitiveDictionary(dictionary)); + } + + public boolean match(Map map) { + Properties props = new Properties(); + props.putAll(map); + return match0(new CaseInsensitiveDictionary(props)); + } + + public static boolean matches(ServiceDeclaration declaration, String filter) { + if (filter == null) { + return true; + } + LDAPFilter filterImpl = newInstance(filter); + return filterImpl.match(declaration.getAttributes()); + } + + /** + * Filter with case sensitivity using a <code>Dictionary</code>. This + * <code>Filter</code> is executed using the specified + * <code>Dictionary</code>'s keys and values. The keys are case + * sensitively matched with this <code>Filter</code>. + * + * @param dictionary The <code>Dictionary</code> whose keys are used in + * the match. + * @return <code>true</code> if the <code>Dictionary</code>'s keys and + * values match this filter; <code>false</code> otherwise. + * @since 1.3 + */ + public boolean matchCase(Dictionary dictionary) { + return match0(dictionary); + } + + /** + * Returns this <code>Filter</code>'s filter string. + * <p> + * The filter string is normalized by removing whitespace which does not + * affect the meaning of the filter. + * + * @return This <code>Filter</code>'s filter string. + */ + public String toString() { + String result = filterString; + if (result == null) { + filterString = result = normalize(); + } + return result; + } + + /** + * Returns this <code>Filter</code>'s normalized filter string. + * <p> + * The filter string is normalized by removing whitespace which does not + * affect the meaning of the filter. + * + * @return This <code>Filter</code>'s filter string. + */ + private String normalize() { + StringBuffer sb = new StringBuffer(); + sb.append('('); + + switch (op) { + case AND: { + sb.append('&'); + + LDAPFilter[] filters = (LDAPFilter[])value; + for (int i = 0, size = filters.length; i < size; i++) { + sb.append(filters[i].normalize()); + } + + break; + } + + case OR: { + sb.append('|'); + + LDAPFilter[] filters = (LDAPFilter[])value; + for (int i = 0, size = filters.length; i < size; i++) { + sb.append(filters[i].normalize()); + } + + break; + } + + case NOT: { + sb.append('!'); + LDAPFilter filter = (LDAPFilter)value; + sb.append(filter.normalize()); + + break; + } + + case SUBSTRING: { + sb.append(attr); + sb.append('='); + + String[] substrings = (String[])value; + + for (int i = 0, size = substrings.length; i < size; i++) { + String substr = substrings[i]; + + if (substr == null) /* * */{ + sb.append('*'); + } else /* xxx */{ + sb.append(encodeValue(substr)); + } + } + + break; + } + case EQUAL: { + sb.append(attr); + sb.append('='); + sb.append(encodeValue((String)value)); + + break; + } + case GREATER: { + sb.append(attr); + sb.append(">="); + sb.append(encodeValue((String)value)); + + break; + } + case LESS: { + sb.append(attr); + sb.append("<="); + sb.append(encodeValue((String)value)); + + break; + } + case APPROX: { + sb.append(attr); + sb.append("~="); + sb.append(encodeValue(approxString((String)value))); + + break; + } + + case PRESENT: { + sb.append(attr); + sb.append("=*"); + + break; + } + } + + sb.append(')'); + + return sb.toString(); + } + + /** + * Compares this <code>Filter</code> to another <code>Filter</code>. + * + * <p> + * This implementation returns the result of calling + * <code>this.toString().equals(obj.toString()</code>. + * + * @param obj The object to compare against this <code>Filter</code>. + * @return If the other object is a <code>Filter</code> object, then + * returns the result of calling + * <code>this.toString().equals(obj.toString()</code>; + * <code>false</code> otherwise. + */ + public boolean equals(Object obj) { + if (obj == this) { + return true; + } + + if (!(obj instanceof LDAPFilter)) { + return false; + } + + return this.toString().equals(obj.toString()); + } + + /** + * Returns the hashCode for this <code>Filter</code>. + * + * <p> + * This implementation returns the result of calling + * <code>this.toString().hashCode()</code>. + * + * @return The hashCode of this <code>Filter</code>. + */ + public int hashCode() { + return this.toString().hashCode(); + } + + /** + * Internal match routine. Dictionary parameter must support + * case-insensitive get. + * + * @param properties A dictionary whose keys are used in the match. + * @return If the Dictionary's keys match the filter, return + * <code>true</code>. Otherwise, return <code>false</code>. + */ + private boolean match0(Dictionary properties) { + switch (op) { + case AND: { + LDAPFilter[] filters = (LDAPFilter[])value; + for (int i = 0, size = filters.length; i < size; i++) { + if (!filters[i].match0(properties)) { + return false; + } + } + + return true; + } + + case OR: { + LDAPFilter[] filters = (LDAPFilter[])value; + for (int i = 0, size = filters.length; i < size; i++) { + if (filters[i].match0(properties)) { + return true; + } + } + + return false; + } + + case NOT: { + LDAPFilter filter = (LDAPFilter)value; + + return !filter.match0(properties); + } + + case SUBSTRING: + case EQUAL: + case GREATER: + case LESS: + case APPROX: { + Object prop = (properties == null) ? null : properties.get(attr); + + return compare(op, prop, value); + } + + case PRESENT: { + Object prop = (properties == null) ? null : properties.get(attr); + + return prop != null; + } + } + + return false; + } + + /** + * Encode the value string such that '(', '*', ')' and '\' are escaped. + * + * @param value unencoded value string. + * @return encoded value string. + */ + private static String encodeValue(String value) { + boolean encoded = false; + int inlen = value.length(); + int outlen = inlen << 1; /* inlen 2 */ + + char[] output = new char[outlen]; + value.getChars(0, inlen, output, inlen); + + int cursor = 0; + for (int i = inlen; i < outlen; i++) { + char c = output[i]; + + switch (c) { + case '(': + case '*': + case ')': + case '\\': { + output[cursor] = '\\'; + cursor++; + encoded = true; + + break; + } + } + + output[cursor] = c; + cursor++; + } + + return encoded ? new String(output, 0, cursor) : value; + } + + private boolean compare(int operation, Object value1, Object value2) { + if (value1 == null) { + return false; + } + if (value1 instanceof String) { + return compare_String(operation, (String)value1, value2); + } + + Class clazz = value1.getClass(); + if (clazz.isArray()) { + Class type = clazz.getComponentType(); + if (type.isPrimitive()) { + return compare_PrimitiveArray(operation, type, value1, value2); + } + return compare_ObjectArray(operation, (Object[])value1, value2); + } + if (value1 instanceof Collection) { + return compare_Collection(operation, (Collection)value1, value2); + } + if (value1 instanceof Integer) { + return compare_Integer(operation, ((Integer)value1).intValue(), value2); + } + if (value1 instanceof Long) { + return compare_Long(operation, ((Long)value1).longValue(), value2); + } + if (value1 instanceof Byte) { + return compare_Byte(operation, ((Byte)value1).byteValue(), value2); + } + if (value1 instanceof Short) { + return compare_Short(operation, ((Short)value1).shortValue(), value2); + } + if (value1 instanceof Character) { + return compare_Character(operation, ((Character)value1).charValue(), value2); + } + if (value1 instanceof Float) { + return compare_Float(operation, ((Float)value1).floatValue(), value2); + } + if (value1 instanceof Double) { + return compare_Double(operation, ((Double)value1).doubleValue(), value2); + } + if (value1 instanceof Boolean) { + return compare_Boolean(operation, ((Boolean)value1).booleanValue(), value2); + } + if (value1 instanceof Comparable) { + return compare_Comparable(operation, (Comparable)value1, value2); + } + return compare_Unknown(operation, value1, value2); // RFC 59 + } + + private boolean compare_Collection(int operation, Collection collection, Object value2) { + for (Iterator iterator = collection.iterator(); iterator.hasNext();) { + if (compare(operation, iterator.next(), value2)) { + return true; + } + } + return false; + } + + private boolean compare_ObjectArray(int operation, Object[] array, Object value2) { + for (int i = 0, size = array.length; i < size; i++) { + if (compare(operation, array[i], value2)) { + return true; + } + } + return false; + } + + private boolean compare_PrimitiveArray(int operation, Class type, Object primarray, Object value2) { + if (Integer.TYPE.isAssignableFrom(type)) { + int[] array = (int[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Integer(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Long.TYPE.isAssignableFrom(type)) { + long[] array = (long[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Long(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Byte.TYPE.isAssignableFrom(type)) { + byte[] array = (byte[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Byte(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Short.TYPE.isAssignableFrom(type)) { + short[] array = (short[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Short(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Character.TYPE.isAssignableFrom(type)) { + char[] array = (char[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Character(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Float.TYPE.isAssignableFrom(type)) { + float[] array = (float[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Float(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Double.TYPE.isAssignableFrom(type)) { + double[] array = (double[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Double(operation, array[i], value2)) { + return true; + } + } + return false; + } + if (Boolean.TYPE.isAssignableFrom(type)) { + boolean[] array = (boolean[])primarray; + for (int i = 0, size = array.length; i < size; i++) { + if (compare_Boolean(operation, array[i], value2)) { + return true; + } + } + return false; + } + return false; + } + + private boolean compare_String(int operation, String string, Object value2) { + switch (operation) { + case SUBSTRING: { + String[] substrings = (String[])value2; + int pos = 0; + for (int i = 0, size = substrings.length; i < size; i++) { + String substr = substrings[i]; + + if (i + 1 < size) /* if this is not that last substr */{ + if (substr == null) /* * */{ + String substr2 = substrings[i + 1]; + + if (substr2 == null) /* ** */ + continue; /* ignore first star */ + /* xxx */ + int index = string.indexOf(substr2, pos); + if (index == -1) { + return false; + } + + pos = index + substr2.length(); + if (i + 2 < size) // if there are more + // substrings, increment + // over the string we just + // matched; otherwise need + // to do the last substr + // check + i++; + } else /* xxx */{ + int len = substr.length(); + if (string.regionMatches(pos, substr, 0, len)) { + pos += len; + } else { + return false; + } + } + } else /* last substr */{ + if (substr == null) /* * */{ + return true; + } + /* xxx */ + return string.endsWith(substr); + } + } + + return true; + } + case EQUAL: { + return string.equals(value2); + } + case APPROX: { + string = approxString(string); + String string2 = approxString((String)value2); + + return string.equalsIgnoreCase(string2); + } + case GREATER: { + return string.compareTo((String)value2) >= 0; + } + case LESS: { + return string.compareTo((String)value2) <= 0; + } + } + return false; + } + + private boolean compare_Integer(int operation, int intval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + int intval2 = Integer.parseInt(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return intval == intval2; + } + case GREATER: { + return intval >= intval2; + } + case LESS: { + return intval <= intval2; + } + } + return false; + } + + private boolean compare_Long(int operation, long longval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + long longval2 = Long.parseLong(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return longval == longval2; + } + case GREATER: { + return longval >= longval2; + } + case LESS: { + return longval <= longval2; + } + } + return false; + } + + private boolean compare_Byte(int operation, byte byteval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + byte byteval2 = Byte.parseByte(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return byteval == byteval2; + } + case GREATER: { + return byteval >= byteval2; + } + case LESS: { + return byteval <= byteval2; + } + } + return false; + } + + private boolean compare_Short(int operation, short shortval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + short shortval2 = Short.parseShort(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return shortval == shortval2; + } + case GREATER: { + return shortval >= shortval2; + } + case LESS: { + return shortval <= shortval2; + } + } + return false; + } + + private boolean compare_Character(int operation, char charval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + char charval2 = (((String)value2).trim()).charAt(0); + switch (operation) { + case EQUAL: { + return charval == charval2; + } + case APPROX: { + return (charval == charval2) || (Character.toUpperCase(charval) == Character.toUpperCase(charval2)) + || (Character.toLowerCase(charval) == Character.toLowerCase(charval2)); + } + case GREATER: { + return charval >= charval2; + } + case LESS: { + return charval <= charval2; + } + } + return false; + } + + private boolean compare_Boolean(int operation, boolean boolval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + boolean boolval2 = Boolean.valueOf(((String)value2).trim()).booleanValue(); + switch (operation) { + case APPROX: + case EQUAL: + case GREATER: + case LESS: { + return boolval == boolval2; + } + } + return false; + } + + private boolean compare_Float(int operation, float floatval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + float floatval2 = Float.parseFloat(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return Float.compare(floatval, floatval2) == 0; + } + case GREATER: { + return Float.compare(floatval, floatval2) >= 0; + } + case LESS: { + return Float.compare(floatval, floatval2) <= 0; + } + } + return false; + } + + private boolean compare_Double(int operation, double doubleval, Object value2) { + if (operation == SUBSTRING) { + return false; + } + double doubleval2 = Double.parseDouble(((String)value2).trim()); + switch (operation) { + case APPROX: + case EQUAL: { + return Double.compare(doubleval, doubleval2) == 0; + } + case GREATER: { + return Double.compare(doubleval, doubleval2) >= 0; + } + case LESS: { + return Double.compare(doubleval, doubleval2) <= 0; + } + } + return false; + } + + private static final Class[] constructorType = new Class[] {String.class}; + + private boolean compare_Comparable(int operation, Comparable value1, Object value2) { + if (operation == SUBSTRING) { + return false; + } + Constructor constructor; + try { + constructor = value1.getClass().getConstructor(constructorType); + } catch (NoSuchMethodException e) { + return false; + } + try { + if (!constructor.isAccessible()) + AccessController.doPrivileged(new SetAccessibleAction(constructor)); + value2 = constructor.newInstance(new Object[] {((String)value2).trim()}); + } catch (IllegalAccessException e) { + return false; + } catch (InvocationTargetException e) { + return false; + } catch (InstantiationException e) { + return false; + } + + switch (operation) { + case APPROX: + case EQUAL: { + return value1.compareTo(value2) == 0; + } + case GREATER: { + return value1.compareTo(value2) >= 0; + } + case LESS: { + return value1.compareTo(value2) <= 0; + } + } + return false; + } + + private boolean compare_Unknown(int operation, Object value1, Object value2) { + if (operation == SUBSTRING) { + return false; + } + Constructor constructor; + try { + constructor = value1.getClass().getConstructor(constructorType); + } catch (NoSuchMethodException e) { + return false; + } + try { + if (!constructor.isAccessible()) + AccessController.doPrivileged(new SetAccessibleAction(constructor)); + value2 = constructor.newInstance(new Object[] {((String)value2).trim()}); + } catch (IllegalAccessException e) { + return false; + } catch (InvocationTargetException e) { + return false; + } catch (InstantiationException e) { + return false; + } + + switch (operation) { + case APPROX: + case EQUAL: + case GREATER: + case LESS: { + return value1.equals(value2); + } + } + return false; + } + + /** + * Map a string for an APPROX (~=) comparison. + * + * This implementation removes white spaces. This is the minimum + * implementation allowed by the OSGi spec. + * + * @param input Input string. + * @return String ready for APPROX comparison. + */ + private static String approxString(String input) { + boolean changed = false; + char[] output = input.toCharArray(); + int cursor = 0; + for (int i = 0, length = output.length; i < length; i++) { + char c = output[i]; + + if (Character.isWhitespace(c)) { + changed = true; + continue; + } + + output[cursor] = c; + cursor++; + } + + return changed ? new String(output, 0, cursor) : input; + } + + /** + * Parser class for OSGi filter strings. This class parses the complete + * filter string and builds a tree of Filter objects rooted at the + * parent. + */ + private static class Parser { + private final String filterstring; + private final char[] filterChars; + private int pos; + + Parser(String filterstring) { + this.filterstring = filterstring; + filterChars = filterstring.toCharArray(); + pos = 0; + } + + LDAPFilter parse() throws InvalidSyntaxException { + LDAPFilter filter; + try { + filter = parse_filter(); + } catch (ArrayIndexOutOfBoundsException e) { + throw new InvalidSyntaxException("Filter ended abruptly", filterstring); + } + + if (pos != filterChars.length) { + throw new InvalidSyntaxException("Extraneous trailing characters: " + filterstring.substring(pos), + filterstring); + } + return filter; + } + + private LDAPFilter parse_filter() throws InvalidSyntaxException { + LDAPFilter filter; + skipWhiteSpace(); + + if (filterChars[pos] != '(') { + throw new InvalidSyntaxException("Missing '(': " + filterstring.substring(pos), filterstring); + } + + pos++; + + filter = parse_filtercomp(); + + skipWhiteSpace(); + + if (filterChars[pos] != ')') { + throw new InvalidSyntaxException("Missing ')': " + filterstring.substring(pos), filterstring); + } + + pos++; + + skipWhiteSpace(); + + return filter; + } + + private LDAPFilter parse_filtercomp() throws InvalidSyntaxException { + skipWhiteSpace(); + + char c = filterChars[pos]; + + switch (c) { + case '&': { + pos++; + return parse_and(); + } + case '|': { + pos++; + return parse_or(); + } + case '!': { + pos++; + return parse_not(); + } + } + return parse_item(); + } + + private LDAPFilter parse_and() throws InvalidSyntaxException { + skipWhiteSpace(); + + if (filterChars[pos] != '(') { + throw new InvalidSyntaxException("Missing '(': " + filterstring.substring(pos), filterstring); + } + + List operands = new ArrayList(10); + + while (filterChars[pos] == '(') { + LDAPFilter child = parse_filter(); + operands.add(child); + } + + return new LDAPFilter(LDAPFilter.AND, null, operands.toArray(new LDAPFilter[operands.size()])); + } + + private LDAPFilter parse_or() throws InvalidSyntaxException { + skipWhiteSpace(); + + if (filterChars[pos] != '(') { + throw new InvalidSyntaxException("Missing '(': " + filterstring.substring(pos), filterstring); + } + + List operands = new ArrayList(10); + + while (filterChars[pos] == '(') { + LDAPFilter child = parse_filter(); + operands.add(child); + } + + return new LDAPFilter(LDAPFilter.OR, null, operands.toArray(new LDAPFilter[operands.size()])); + } + + private LDAPFilter parse_not() throws InvalidSyntaxException { + skipWhiteSpace(); + + if (filterChars[pos] != '(') { + throw new InvalidSyntaxException("Missing '(': " + filterstring.substring(pos), filterstring); + } + + LDAPFilter child = parse_filter(); + + return new LDAPFilter(LDAPFilter.NOT, null, child); + } + + private LDAPFilter parse_item() throws InvalidSyntaxException { + String attr = parse_attr(); + + skipWhiteSpace(); + + switch (filterChars[pos]) { + case '~': { + if (filterChars[pos + 1] == '=') { + pos += 2; + return new LDAPFilter(LDAPFilter.APPROX, attr, parse_value()); + } + break; + } + case '>': { + if (filterChars[pos + 1] == '=') { + pos += 2; + return new LDAPFilter(LDAPFilter.GREATER, attr, parse_value()); + } + break; + } + case '<': { + if (filterChars[pos + 1] == '=') { + pos += 2; + return new LDAPFilter(LDAPFilter.LESS, attr, parse_value()); + } + break; + } + case '=': { + if (filterChars[pos + 1] == '*') { + int oldpos = pos; + pos += 2; + skipWhiteSpace(); + if (filterChars[pos] == ')') { + return new LDAPFilter(LDAPFilter.PRESENT, attr, null); + } + pos = oldpos; + } + + pos++; + Object string = parse_substring(); + + if (string instanceof String) { + return new LDAPFilter(LDAPFilter.EQUAL, attr, string); + } + return new LDAPFilter(LDAPFilter.SUBSTRING, attr, string); + } + } + + throw new InvalidSyntaxException("Invalid operator: " + filterstring.substring(pos), filterstring); + } + + private String parse_attr() throws InvalidSyntaxException { + skipWhiteSpace(); + + int begin = pos; + int end = pos; + + char c = filterChars[pos]; + + while (c != '~' && c != '<' && c != '>' && c != '=' && c != '(' && c != ')') { + pos++; + + if (!Character.isWhitespace(c)) { + end = pos; + } + + c = filterChars[pos]; + } + + int length = end - begin; + + if (length == 0) { + throw new InvalidSyntaxException("Missing attr: " + filterstring.substring(pos), filterstring); + } + + return new String(filterChars, begin, length); + } + + private String parse_value() throws InvalidSyntaxException { + StringBuffer sb = new StringBuffer(filterChars.length - pos); + + parseloop: while (true) { + char c = filterChars[pos]; + + switch (c) { + case ')': { + break parseloop; + } + + case '(': { + throw new InvalidSyntaxException("Invalid value: " + filterstring.substring(pos), + filterstring); + } + + case '\\': { + pos++; + c = filterChars[pos]; + /* fall through into default */ + } + + default: { + sb.append(c); + pos++; + break; + } + } + } + + if (sb.length() == 0) { + throw new InvalidSyntaxException("Missing value: " + filterstring.substring(pos), filterstring); + } + + return sb.toString(); + } + + private Object parse_substring() throws InvalidSyntaxException { + StringBuffer sb = new StringBuffer(filterChars.length - pos); + + List operands = new ArrayList(10); + + parseloop: while (true) { + char c = filterChars[pos]; + + switch (c) { + case ')': { + if (sb.length() > 0) { + operands.add(sb.toString()); + } + + break parseloop; + } + + case '(': { + throw new InvalidSyntaxException("Invalid value: " + filterstring.substring(pos), + filterstring); + } + + case '*': { + if (sb.length() > 0) { + operands.add(sb.toString()); + } + + sb.setLength(0); + + operands.add(null); + pos++; + + break; + } + + case '\\': { + pos++; + c = filterChars[pos]; + /* fall through into default */ + } + + default: { + sb.append(c); + pos++; + break; + } + } + } + + int size = operands.size(); + + if (size == 0) { + throw new InvalidSyntaxException("Missing value: " + filterstring.substring(pos), filterstring); + } + + if (size == 1) { + Object single = operands.get(0); + + if (single != null) { + return single; + } + } + + return operands.toArray(new String[size]); + } + + private void skipWhiteSpace() { + for (int length = filterChars.length; (pos < length) && Character.isWhitespace(filterChars[pos]);) { + pos++; + } + } + } + + /** + * This Dictionary is used for case-insensitive key lookup during filter + * evaluation. This Dictionary implementation only supports the get + * operation using a String key as no other operations are used by the + * Filter implementation. + */ + static class CaseInsensitiveDictionary extends Dictionary { + private final Dictionary dictionary; + private final String[] keys; + + /** + * Create a case insensitive dictionary from the specified dictionary. + * + * @param dictionary + * @throws IllegalArgumentException If <code>dictionary</code> contains + * case variants of the same key name. + */ + CaseInsensitiveDictionary(Dictionary dictionary) { + if (dictionary == null) { + this.dictionary = null; + this.keys = new String[0]; + return; + } + this.dictionary = dictionary; + List keyList = new ArrayList(dictionary.size()); + for (Enumeration e = dictionary.keys(); e.hasMoreElements();) { + Object k = e.nextElement(); + if (k instanceof String) { + String key = (String)k; + for (Iterator i = keyList.iterator(); i.hasNext();) { + if (key.equalsIgnoreCase((String)i.next())) { + throw new IllegalArgumentException(); + } + } + keyList.add(key); + } + } + this.keys = (String[])keyList.toArray(new String[keyList.size()]); + } + + public Object get(Object o) { + String k = (String)o; + for (int i = 0, length = keys.length; i < length; i++) { + String key = keys[i]; + if (key.equalsIgnoreCase(k)) { + return dictionary.get(key); + } + } + return null; + } + + public boolean isEmpty() { + throw new UnsupportedOperationException(); + } + + public Enumeration keys() { + throw new UnsupportedOperationException(); + } + + public Enumeration elements() { + throw new UnsupportedOperationException(); + } + + public Object put(Object key, Object value) { + throw new UnsupportedOperationException(); + } + + public Object remove(Object key) { + throw new UnsupportedOperationException(); + } + + public int size() { + throw new UnsupportedOperationException(); + } + } + + static class SetAccessibleAction implements PrivilegedAction { + private final AccessibleObject accessible; + + SetAccessibleAction(AccessibleObject accessible) { + this.accessible = accessible; + } + + public Object run() { + accessible.setAccessible(true); + return null; + } + } +}
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