Message resolver goes bye bye. We resolve messages with I18nTool now.
git-svn-id: https://samskivert.googlecode.com/svn/trunk@726 6335cc39-0255-0410-8fd6-9bcaacd3b74c
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mdb
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//
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// $Id: MessageResolver.java,v 1.1 2001/10/31 09:44:22 mdb Exp $
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//
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// samskivert library - useful routines for java programs
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// Copyright (C) 2001 Michael Bayne
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.samskivert.velocity;
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import org.apache.velocity.context.InternalContextAdapter;
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import org.apache.velocity.exception.MethodInvocationException;
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import org.apache.velocity.runtime.parser.node.ASTIdentifier;
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import org.apache.velocity.runtime.parser.node.ASTMethod;
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import org.apache.velocity.runtime.parser.node.Node;
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import org.apache.velocity.runtime.parser.node.ReferenceResolver;
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import com.samskivert.Log;
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import com.samskivert.servlet.MessageManager;
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/**
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* Maps a set of appliation messages (translation strings) into the
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* context so that they are available to templates that wish to display
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* localized text.
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*
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* <p> If a message resolver is mapped into the context as
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* <code>i18n</code>, then it might be accessed as follows:
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*
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* <pre>
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* $i18n.main.intro($user.username)
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* </pre>
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*
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* where <code>main.intro</code> might be defined in the message resource
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* file as:
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*
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* <pre>
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* main.intro=Hello there {0}, welcome to our site!
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* </pre>
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*
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* @see MessageManager
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*/
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public class MessageResolver implements ReferenceResolver
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{
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/**
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* Constructs a new message resolver which will use the supplied
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* message manager to obtain translated strings.
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*/
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public MessageResolver (MessageManager msgmgr)
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{
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_msgmgr = msgmgr;
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}
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/**
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* Concatenates the remaining reference nodes into a single message
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* name and looks up the matching translation string. If the last node
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* is an {@link ASTMethod}, then the arguments from that are
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* substituted into the translated message.
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*/
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public Object resolveReference (
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InternalContextAdapter ctx, Node[] nodes, int offset)
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throws MethodInvocationException
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{
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StringBuffer path = new StringBuffer();
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boolean bogus = false;
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int lastidx = nodes.length-1;
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Object result = this;
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// reconstruct the path to the property
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for (int i = offset; i < nodes.length; i++) {
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// separate components with dots
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if (path.length() > 0) {
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path.append(".");
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}
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// if the node is an ASTMethod, it dang well better be the
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// last thing in the chain or we've got a problem
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if (nodes[i] instanceof ASTMethod) {
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ASTMethod mnode = (ASTMethod)nodes[i];
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// make a note to freak out if this is anything but
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// the last component of the path. we'd freak out now
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// but we want to reconstruct the path so that we can
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// report it in the exception that's thrown
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if (i != lastidx) {
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bogus = true;
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}
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path.append(mnode.getMethodName());
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} else if (nodes[i] instanceof ASTIdentifier) {
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ASTIdentifier inode = (ASTIdentifier)nodes[i];
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path.append(inode.getIdentifier());
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} else {
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// what is it man?
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bogus = true;
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path.append("?").append(nodes[i]);
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}
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}
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// do any pending freaking out
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if (bogus) {
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throw new MethodInvocationException(
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"Invalid message resource path.", null, path.toString());
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}
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// we need to get the invocation context from our internal context
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// adapter
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InvocationContext ictx = (InvocationContext)
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ctx.getInternalUserContext();
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// if the last component is a property method, we want to use
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// it's arguments when looking up the message
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if (nodes[lastidx] instanceof ASTMethod) {
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ASTMethod mnode = (ASTMethod)nodes[lastidx];
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// we may cache message formatters later, but for now just
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// use the static convenience function
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Object[] args = mnode.getParams(ctx);
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return _msgmgr.getMessage(ictx.getRequest(),
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path.toString(), args);
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} else {
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// otherwise just look up the path
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return _msgmgr.getMessage(ictx.getRequest(), path.toString());
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}
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}
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protected MessageManager _msgmgr;
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}
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