memorynamingcontext.java

Tomcat 4.1与WebServer集成组件的源代码包.

/*
 * ====================================================================
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 * The Apache Software License, Version 1.1
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package org.apache.naming.modules.memory;

import java.util.Hashtable;
import java.util.Enumeration;
import javax.naming.*;
import javax.naming.directory.*;
import javax.naming.spi.NamingManager;

import org.apache.naming.core.*;
import org.apache.tomcat.util.res.*;

/**
 * In-memory context.
 *
 * IMPLEMENTATION. We use NamingEntry stored in a tree of hashtables. 
 *
 * @author Remy Maucherat
 * @author Costin Manolache
 */
public class MemoryNamingContext extends BaseDirContext {

    public MemoryNamingContext()
        throws NamingException
    {
        super();
    }

    /**
     * Builds a naming context using the given environment.
     */
    public MemoryNamingContext(Hashtable env) 
        throws NamingException
    {
        super( env );
        this.bindings = new Hashtable();
    }

    // ----------------------------------------------------- Instance Variables

    /**
     * The string manager for this package.
     */
    protected static StringManager sm =
        StringManager.getManager("org.apache.naming.res");

    /**
     * Bindings in this Context.
     */
    protected Hashtable bindings;

    public void setBindings( Hashtable bindings ) {
        this.bindings = bindings;
    }

    // -------------------------------------------------------- Context Methods

    /**
     * Unbinds the named object. Removes the terminal atomic name in name 
     * from the target context--that named by all but the terminal atomic 
     * part of name.
     * <p>
     * This method is idempotent. It succeeds even if the terminal atomic 
     * name is not bound in the target context, but throws 
     * NameNotFoundException if any of the intermediate contexts do not exist. 
     * 
     * @param name the name to bind; may not be empty
     * @exception NameNotFoundException if an intermediate context does not 
     * exist
     * @exception NamingException if a naming exception is encountered
     */
    public void unbind(Name name, boolean isContext)
        throws NamingException
    {
        checkWritable(name);
        
	while ((!name.isEmpty()) && (name.get(0).length() == 0))
	    name = name.getSuffix(1);
        
        if (name.isEmpty())
            throw new NamingException
                (sm.getString("namingContext.invalidName"));
        
        NamingEntry entry = (NamingEntry) bindings.get(name.get(0));
        
        if (entry == null) {
            throw new NameNotFoundException
                (sm.getString("namingContext.nameNotBound", name.get(0)));
        }
        
        if (name.size() > 1) {
            if (entry.type == NamingEntry.CONTEXT) {
                ((Context) entry.value).unbind(name.getSuffix(1));
            } else {
                throw new NamingException
                    (sm.getString("namingContext.contextExpected"));
            }
        } else {
            if (entry.type == NamingEntry.CONTEXT) {
                ((Context) entry.value).close();
                bindings.remove(name.get(0));
            } else {
                if( isContext ) {
                    throw new NotContextException
                        (sm.getString("namingContext.contextExpected"));
                } else {
                    bindings.remove(name.get(0));
                }
            }
        }
    }

    /**
     * Enumerates the names bound in the named context, along with the class 
     * names of objects bound to them. The contents of any subcontexts are 
     * not included.
     * <p>
     * If a binding is added to or removed from this context, its effect on 
     * an enumeration previously returned is undefined.
     * 
     * @param name the name of the context to list
     * @return an enumeration of the names and class names of the bindings in 
     * this context. Each element of the enumeration is of type NameClassPair.
     * @exception NamingException if a naming exception is encountered
     */
    public NamingEnumeration list(Name name)
        throws NamingException {
        // Removing empty parts
        while ((!name.isEmpty()) && (name.get(0).length() == 0))
            name = name.getSuffix(1);

        if (name.isEmpty()) {
            return new NamingContextEnumeration(bindings.elements(), this, false);
        }
        
        NamingEntry entry = (NamingEntry) bindings.get(name.get(0));
        
        if (entry == null) {
            throw new NameNotFoundException
                (sm.getString("namingContext.nameNotBound", name.get(0)));
        }
        
        if (entry.type != NamingEntry.CONTEXT) {
            throw new NamingException
                (sm.getString("namingContext.contextExpected"));
        }
        return ((Context) entry.value).list(name.getSuffix(1));
    }

    private Name removeEmptyPrefix(Name name ) {
        while ((!name.isEmpty()) && (name.get(0).length() == 0))
            name = name.getSuffix(1);
        return name;