Examples with PathElement org.apache.aries.spifly.HeaderParser.PathElement used on opensource projects

Example 1 with PathElement

use of org.apache.aries.spifly.HeaderParser.PathElement in project aries by apache.

the class ConsumerHeaderProcessor method processHeader.

/**
 * Parses headers of the following syntax:
 * <ul>
 * <li><tt>org.acme.MyClass#myMethod</tt> - apply the weaving to all overloads of <tt>myMethod()</tt>
 * in <tt>MyClass</tt>
 * <li><tt>org.acme.MyClass#myMethod(java.lang.String, java.util.List)</tt> - apply the weaving only
 * to the <tt>myMethod(String, List)</tt> overload in <tt>MyClass</tt>
 * <li><tt>org.acme.MyClass#myMethod()</tt> - apply the weaving only to the noarg overload of
 * <tt>myMethod()</tt>
 * <li><b>true</b> - equivalent to <tt>java.util.ServiceLoader#load(java.lang.Class)</tt>
 * </ul>
 * Additionally, it registers the consumer's constraints with the consumer registry in the activator, if the
 * consumer is only constrained to a certain set of bundles.<p>
 *
 * The following attributes are supported:
 * <ul>
 * <li><tt>bundle</tt> - restrict wiring to the bundle with the specifies Symbolic Name. The attribute value
 * is a list of bundle identifiers separated by a '|' sign. The bundle identifier starts with the Symbolic name
 * and can optionally contain a version suffix. E.g. bundle=impl2:version=1.2.3 or bundle=impl2|impl4.
 * <li><tt>bundleId</tt> - restrict wiring to the bundle with the specified bundle ID. Typically used when
 * the service should be forcibly picked up from the system bundle (<tt>bundleId=0</tt>). Multiple bundle IDs
 * can be specified separated by a '|' sign.
 * </ul>
 *
 * @param consumerHeaderName the name of the header (either Require-Capability or SPI-Consumer)
 * @param consumerHeader the <tt>SPI-Consumer</tt> header.
 * @return an instance of the {@link WeavingData} class.
 * @throws Exception when a header cannot be parsed.
 */
public static Set<WeavingData> processHeader(String consumerHeaderName, String consumerHeader) throws Exception {
    if (SpiFlyConstants.REQUIRE_CAPABILITY.equals(consumerHeaderName)) {
        return processRequireCapabilityHeader(consumerHeader);
    }
    Set<WeavingData> weavingData = new HashSet<WeavingData>();
    for (PathElement element : HeaderParser.parseHeader(consumerHeader)) {
        List<BundleDescriptor> allowedBundles = new ArrayList<BundleDescriptor>();
        String name = element.getName().trim();
        String className;
        String methodName;
        MethodRestriction methodRestriction;
        boolean serviceLoader = false;
        int hashIdx = name.indexOf('#');
        if (hashIdx > 0) {
            className = name.substring(0, hashIdx);
            int braceIdx = name.substring(hashIdx).indexOf('(');
            if (braceIdx > 0) {
                methodName = name.substring(hashIdx + 1, hashIdx + braceIdx);
                ArgRestrictions argRestrictions = new ArgRestrictions();
                int closeIdx = name.substring(hashIdx).indexOf(')');
                if (closeIdx > 0) {
                    String classes = name.substring(hashIdx + braceIdx + 1, hashIdx + closeIdx).trim();
                    if (classes.length() > 0) {
                        if (classes.indexOf('[') > 0) {
                            int argNumber = 0;
                            for (String s : classes.split(",")) {
                                int idx = s.indexOf('[');
                                int end = s.indexOf(']', idx);
                                if (idx > 0 && end > idx) {
                                    argRestrictions.addRestriction(argNumber, s.substring(0, idx), s.substring(idx + 1, end));
                                } else {
                                    argRestrictions.addRestriction(argNumber, s);
                                }
                                argNumber++;
                            }
                        } else {
                            String[] classNames = classes.split(",");
                            for (int i = 0; i < classNames.length; i++) {
                                argRestrictions.addRestriction(i, classNames[i]);
                            }
                        }
                    } else {
                        argRestrictions = null;
                    }
                }
                methodRestriction = new MethodRestriction(methodName, argRestrictions);
            } else {
                methodName = name.substring(hashIdx + 1);
                methodRestriction = new MethodRestriction(methodName);
            }
        } else {
            if ("*".equalsIgnoreCase(name)) {
                serviceLoader = true;
                className = ServiceLoader.class.getName();
                methodName = "load";
                ArgRestrictions argRestrictions = new ArgRestrictions();
                argRestrictions.addRestriction(0, Class.class.getName());
                methodRestriction = new MethodRestriction(methodName, argRestrictions);
            } else {
                throw new IllegalArgumentException("Must at least specify class name and method name: " + name);
            }
        }
        String bsn = element.getAttribute("bundle");
        if (bsn != null) {
            bsn = bsn.trim();
            if (bsn.length() > 0) {
                for (String s : bsn.split("\\|")) {
                    int colonIdx = s.indexOf(':');
                    if (colonIdx > 0) {
                        String sn = s.substring(0, colonIdx);
                        String versionSfx = s.substring(colonIdx + 1);
                        if (versionSfx.startsWith("version=")) {
                            allowedBundles.add(new BundleDescriptor(sn, Version.parseVersion(versionSfx.substring("version=".length()))));
                        } else {
                            allowedBundles.add(new BundleDescriptor(sn));
                        }
                    } else {
                        allowedBundles.add(new BundleDescriptor(s));
                    }
                }
            }
        }
        String bid = element.getAttribute("bundleId");
        if (bid != null) {
            bid = bid.trim();
            if (bid.length() > 0) {
                for (String s : bid.split("\\|")) {
                    allowedBundles.add(new BundleDescriptor(Long.parseLong(s)));
                }
            }
        }
        weavingData.add(createWeavingData(className, methodName, methodRestriction, allowedBundles));
        if (serviceLoader) {
            className = ServiceLoader.class.getName();
            methodName = "load";
            ArgRestrictions argRestrictions = new ArgRestrictions();
            argRestrictions.addRestriction(0, Class.class.getName());
            argRestrictions.addRestriction(1, ClassLoader.class.getName());
            methodRestriction = new MethodRestriction(methodName, argRestrictions);
            weavingData.add(createWeavingData(className, methodName, methodRestriction, allowedBundles));
        }
    }
    return weavingData;
}