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No effective change - code format
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Robin Bygrave committed
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+124
-125
@@ -8,140 +8,139 @@ import org.slf4j.LoggerFactory;
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* <p>
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* Helper for ClassUtil.
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* </p>
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*
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*
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* @author rbygrave
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*
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*/
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class ClassLoadContext {
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private static final Logger logger = LoggerFactory.getLogger(ClassLoadContext.class);
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private final ClassLoader callerLoader;
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private static final Logger logger = LoggerFactory.getLogger(ClassLoadContext.class);
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private final ClassLoader contextLoader;
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private final ClassLoader callerLoader;
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private final boolean preferContext;
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private boolean ambiguous;
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public static ClassLoadContext of(Class<?> caller, boolean preferContext) {
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return new ClassLoadContext(caller, preferContext);
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private final ClassLoader contextLoader;
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private final boolean preferContext;
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private boolean ambiguous;
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public static ClassLoadContext of(Class<?> caller, boolean preferContext) {
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return new ClassLoadContext(caller, preferContext);
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}
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/**
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* This constructor is package-private to restrict instantiation to
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*/
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ClassLoadContext(final Class<?> caller, boolean preferContext) {
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if (caller == null) {
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throw new IllegalArgumentException("caller is null");
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}
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this.callerLoader = caller.getClassLoader();
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this.contextLoader = Thread.currentThread().getContextClassLoader();
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this.preferContext = preferContext;
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}
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public Class<?> forName(String name) throws ClassNotFoundException {
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ClassLoader defaultLoader = getDefault(preferContext);
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try {
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return Class.forName(name, true, defaultLoader);
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} catch (ClassNotFoundException e) {
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if (callerLoader == defaultLoader) {
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throw e;
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} else {
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return Class.forName(name, true, callerLoader);
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}
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}
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}
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/**
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* Return the expected class loader to use.
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* <p>
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* Works on the assumption that the child of the caller or context class
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* loader is preferred.
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* </p>
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*/
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public ClassLoader getDefault(boolean preferContext) {
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if (contextLoader == null) {
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if (logger.isDebugEnabled()) {
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logger.debug("No Context ClassLoader, using " + callerLoader.getClass().getName());
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}
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return callerLoader;
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}
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if (contextLoader == callerLoader) {
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if (logger.isDebugEnabled()) {
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logger.debug("Context and Caller ClassLoader's same instance of " + contextLoader.getClass().getName());
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}
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return callerLoader;
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}
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/**
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* This constructor is package-private to restrict instantiation to
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*/
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ClassLoadContext(final Class<?> caller, boolean preferContext) {
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if (caller == null){
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throw new IllegalArgumentException("caller is null");
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}
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this.callerLoader = caller.getClassLoader();
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this.contextLoader = Thread.currentThread().getContextClassLoader();
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this.preferContext = preferContext;
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if (isChild(contextLoader, callerLoader)) {
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if (logger.isDebugEnabled()) {
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logger.debug("Caller ClassLoader " + callerLoader.getClass().getName()
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+ " child of ContextLoader " + contextLoader.getClass().getName());
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}
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return callerLoader;
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} else if (isChild(callerLoader, contextLoader)) {
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if (logger.isDebugEnabled()) {
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logger.debug("Context ClassLoader " + contextLoader.getClass().getName()
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+ " child of Caller ClassLoader " + callerLoader.getClass().getName());
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}
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return contextLoader;
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} else {
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// ambiguous case, perhaps both null
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logger.debug("Ambiguous ClassLoader choice preferContext:" + preferContext
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+ " Context:" + contextLoader.getClass().getName() + " Caller:" + callerLoader.getClass().getName());
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ambiguous = true;
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return preferContext ? contextLoader : callerLoader;
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}
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}
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/**
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* Return true if the 'default' class loader is ambiguous.
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*/
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public boolean isAmbiguous() {
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return ambiguous;
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}
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/**
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* Return the ClassLoader of the caller.
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*/
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public ClassLoader getCallerLoader() {
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return callerLoader;
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}
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/**
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* Return the Thread Context ClassLoader.
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*/
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public ClassLoader getContextLoader() {
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return contextLoader;
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}
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/**
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* Return the ClassLoader for this class.
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*/
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public ClassLoader getThisLoader() {
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return this.getClass().getClassLoader();
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}
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/**
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* Returns 'true' if 'loader2' is a delegation child of 'loader1' [or if
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* 'loader1'=='loader2'].
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*/
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private boolean isChild(final ClassLoader loader1, ClassLoader loader2) {
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for (; loader2 != null; loader2 = loader2.getParent()) {
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if (loader2 == loader1) {
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return true;
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}
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}
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public Class<?> forName(String name) throws ClassNotFoundException {
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ClassLoader defaultLoader = getDefault(preferContext);
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try {
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return Class.forName(name, true, defaultLoader);
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} catch (ClassNotFoundException e) {
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if (callerLoader == defaultLoader) {
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throw e;
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} else {
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return Class.forName(name, true, callerLoader);
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}
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}
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}
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/**
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* Return the expected class loader to use.
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* <p>
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* Works on the assumption that the child of the caller or context class
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* loader is preferred.
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* </p>
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*/
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public ClassLoader getDefault(boolean preferContext) {
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if (contextLoader == null){
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if (logger.isDebugEnabled()){
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logger.debug("No Context ClassLoader, using "+callerLoader.getClass().getName());
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}
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return callerLoader;
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}
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if (contextLoader == callerLoader){
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if (logger.isDebugEnabled()){
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logger.debug("Context and Caller ClassLoader's same instance of "+contextLoader.getClass().getName());
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}
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return callerLoader;
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}
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if (isChild(contextLoader, callerLoader)) {
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if (logger.isDebugEnabled()){
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logger.debug("Caller ClassLoader "+callerLoader.getClass().getName()
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+" child of ContextLoader "+contextLoader.getClass().getName());
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}
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return callerLoader;
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} else if (isChild(callerLoader, contextLoader)) {
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if (logger.isDebugEnabled()){
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logger.debug("Context ClassLoader "+contextLoader.getClass().getName()
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+" child of Caller ClassLoader "+callerLoader.getClass().getName());
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}
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return contextLoader;
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} else {
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// ambiguous case, perhaps both null
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logger.debug("Ambiguous ClassLoader choice preferContext:"+preferContext
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+" Context:"+contextLoader.getClass().getName()+" Caller:"+callerLoader.getClass().getName());
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ambiguous = true;
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return preferContext ? contextLoader : callerLoader;
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}
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}
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/**
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* Return true if the 'default' class loader is ambiguous.
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*/
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public boolean isAmbiguous() {
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return ambiguous;
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}
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/**
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* Return the ClassLoader of the caller.
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*/
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public ClassLoader getCallerLoader() {
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return callerLoader;
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}
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/**
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* Return the Thread Context ClassLoader.
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*/
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public ClassLoader getContextLoader() {
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return contextLoader;
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}
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/**
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* Return the ClassLoader for this class.
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*/
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public ClassLoader getThisLoader() {
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return this.getClass().getClassLoader();
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}
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/**
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* Returns 'true' if 'loader2' is a delegation child of 'loader1' [or if
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* 'loader1'=='loader2'].
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*/
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private boolean isChild(final ClassLoader loader1, ClassLoader loader2) {
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for (; loader2 != null; loader2 = loader2.getParent()) {
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if (loader2 == loader1) {
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return true;
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}
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}
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return false;
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}
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return false;
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}
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}
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