public static String generateFilter()

in util/src/main/java/org/apache/aries/util/manifest/ManifestHeaderProcessor.java [523:633]
78 lines of code
22 McCabe index (conditional complexity)

	public static String generateFilter(Map<String, String> attribs) {
		StringBuilder filter = new StringBuilder("(&");
		boolean realAttrib = false;
		StringBuffer realAttribs = new StringBuffer();

		if (attribs == null) {
			attribs = new HashMap<String, String>();
		}

		for (Map.Entry<String, String> attrib : attribs.entrySet()) {
			String attribName = attrib.getKey();

			if (attribName.endsWith(":")) {
				// skip all directives. It is used to affect the attribs on the
				// filter xml.
			} else if ((Constants.VERSION_ATTRIBUTE.equals(attribName))
					|| (Constants.BUNDLE_VERSION_ATTRIBUTE.equals(attribName))) {
				// version and bundle-version attrib requires special
				// conversion.
				realAttrib = true;

				VersionRange vr = ManifestHeaderProcessor
						.parseVersionRange(attrib.getValue());

				filter.append("(" + attribName + ">=" + vr.getMinimumVersion());

				if (vr.getMaximumVersion() != null) {
					filter.append(")(" + attribName + "<=");
					filter.append(vr.getMaximumVersion());
				}

				if (vr.getMaximumVersion() != null && vr.isMinimumExclusive()) {
					filter.append(")(!(" + attribName + "=");
					filter.append(vr.getMinimumVersion());
					filter.append(")");
				}

				if (vr.getMaximumVersion() != null && vr.isMaximumExclusive()) {
					filter.append(")(!(" + attribName + "=");
					filter.append(vr.getMaximumVersion());
					filter.append(")");
				}
				filter.append(")");

			} else if (NESTED_FILTER_ATTRIBUTE_TO_USE_WITHOUT_FORMATTING.equals(attribName)) {
				// Filters go in whole, no formatting needed
				realAttrib = true;
				filter.append(attrib.getValue());

			} else if (Constants.OBJECTCLASS.equals(attribName)) {
				realAttrib = true;
				// objectClass has a "," separated list of interfaces
				String[] values = attrib.getValue().split(",");
				for (String s : values)
					filter.append("(" + Constants.OBJECTCLASS + "=" + s + ")");

			} else {
				// attribName was not version..
				realAttrib = true;

				filter.append("(" + attribName + "=" + attrib.getValue() + ")");
				// store all attributes in order to build up the mandatory
				// filter and separate them with ", "
				// skip bundle-symbolic-name in the mandatory directive query
				if (!Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE
						.equals(attribName)) {
					realAttribs.append(attribName);
					realAttribs.append(", ");
				}
			}
		}
		/*
		 * The following is how OBR makes mandatory attributes work, we require
		 * that the set of mandatory attributes on the export is a subset of (or
		 * equal to) the set of the attributes we supply.
		 */

		if (realAttribs.length() > 0) {
			String attribStr = (realAttribs.toString()).trim();
			// remove the final ,
			if ((attribStr.length() > 0) && (attribStr.endsWith(","))) {
				attribStr = attribStr.substring(0, attribStr.length() - 1);
			}
			// build the mandatory filter, e.g.(mandatory:&lt;*company, local)
			filter.append("(" + Constants.MANDATORY_DIRECTIVE + ":" + "<*"
					+ attribStr + ")");
		}

		// Prune (& off the front and ) off end
		String filterString = filter.toString();
		int openBraces = 0;
		for (int i = 0; openBraces < 3; i++) {
			i = filterString.indexOf('(', i);
			if (i == -1) {
				break;
			} else {
				openBraces++;
			}
		}
		if (openBraces < 3 && filterString.length() > 2) {
			filter.delete(0, 2);
		} else {
			filter.append(")");
		}

		String result = "";
		if (realAttrib != false) {
			result = filter.toString();
		}
		return result;
	}