| /* Bindings.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.xml.transform; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.Map; |
| import javax.xml.namespace.QName; |
| import javax.xml.xpath.XPathVariableResolver; |
| import org.w3c.dom.Node; |
| |
| /** |
| * The set of variable bindings in effect for a stylesheet. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| public class Bindings |
| implements XPathVariableResolver, Cloneable |
| { |
| |
| static final int VARIABLE = 0; |
| static final int PARAM = 1; |
| static final int WITH_PARAM = 2; |
| |
| final Stylesheet stylesheet; |
| |
| /** |
| * Global variables. |
| */ |
| final LinkedList variables; |
| |
| /** |
| * Parameter value stack. |
| */ |
| final LinkedList parameters; |
| |
| /** |
| * Argument (with-param) value stack. |
| */ |
| final LinkedList withParameters; |
| |
| /** |
| * Only search globals. |
| */ |
| boolean global; |
| |
| Bindings(Stylesheet stylesheet) |
| { |
| this.stylesheet = stylesheet; |
| variables = new LinkedList(); |
| parameters = new LinkedList(); |
| withParameters = new LinkedList(); |
| for (int i = 0; i < 3; i++) |
| { |
| push(i); |
| } |
| } |
| |
| public Object clone() |
| { |
| try |
| { |
| return (Bindings) super.clone(); |
| } |
| catch (CloneNotSupportedException e) |
| { |
| throw new Error(e.getMessage()); |
| } |
| } |
| |
| void push(int type) |
| { |
| switch (type) |
| { |
| case VARIABLE: |
| variables.addFirst(new HashMap()); |
| break; |
| case PARAM: |
| parameters.addFirst(new HashMap()); |
| break; |
| case WITH_PARAM: |
| withParameters.addFirst(new HashMap()); |
| break; |
| } |
| } |
| |
| void pop(int type) |
| { |
| switch (type) |
| { |
| case VARIABLE: |
| variables.removeFirst(); |
| break; |
| case PARAM: |
| parameters.removeFirst(); |
| break; |
| case WITH_PARAM: |
| withParameters.removeFirst(); |
| break; |
| } |
| } |
| |
| public boolean containsKey(QName name, int type) |
| { |
| if (global) |
| { |
| Map ctx1 = (Map) variables.getLast(); |
| Map ctx2 = (Map) parameters.getLast(); |
| return (ctx1.containsKey(name) || ctx2.containsKey(name)); |
| } |
| Iterator i = null; |
| switch (type) |
| { |
| case VARIABLE: |
| i = variables.iterator(); |
| break; |
| case PARAM: |
| i = parameters.iterator(); |
| break; |
| case WITH_PARAM: |
| Map ctx = (Map) withParameters.getFirst(); |
| return ctx.containsKey(name); |
| } |
| if (i != null) |
| { |
| while (i.hasNext()) |
| { |
| Map ctx = (Map) i.next(); |
| if (ctx.containsKey(name)) |
| { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| public Object get(QName name, Node context, int pos, int len) |
| { |
| if (global) |
| { |
| Map ctx = (Map) variables.getLast(); |
| Object ret = ctx.get(name); |
| if (ret == null) |
| { |
| ctx = (Map) parameters.getLast(); |
| ret = ctx.get(name); |
| } |
| return ret; |
| } |
| //System.err.println("bindings.get: "+name); |
| //System.err.println("\t"+toString()); |
| Object ret = null; |
| //if (parameters.size() > 1 && containsKey(name, PARAM)) |
| // check that template defines parameter |
| { |
| Map cwp = (Map) withParameters.getFirst(); |
| ret = cwp.get(name); |
| //System.err.println("\twith-param: ret="+ret); |
| } |
| if (ret == null) |
| { |
| for (Iterator i = variables.iterator(); i.hasNext() && ret == null; ) |
| { |
| Map vctx = (Map) i.next(); |
| ret = vctx.get(name); |
| } |
| //System.err.println("\tvariable: ret="+ret); |
| } |
| if (ret == null) |
| { |
| for (Iterator i = parameters.iterator(); i.hasNext() && ret == null; ) |
| { |
| Map pctx = (Map) i.next(); |
| ret = pctx.get(name); |
| } |
| //System.err.println("\tparam: ret="+ret); |
| } |
| /*if (ret instanceof Expr && context != null) |
| { |
| Expr expr = (Expr) ret; |
| ret = expr.evaluate(context, 1, 1); |
| }*/ |
| if (ret instanceof Node) |
| { |
| ret = Collections.singleton(ret); |
| } |
| if (ret == null) |
| { |
| ret = ""; |
| } |
| //System.err.println("\tret="+ret); |
| return ret; |
| } |
| |
| void set(QName name, Object value, int type) |
| { |
| switch (type) |
| { |
| case VARIABLE: |
| Map vctx = (Map) variables.getFirst(); |
| vctx.put(name, value); |
| break; |
| case PARAM: |
| Map pctx = (Map) parameters.getFirst(); |
| pctx.put(name, value); |
| break; |
| case WITH_PARAM: |
| Map wctx = (Map) withParameters.getFirst(); |
| wctx.put(name, value); |
| break; |
| } |
| //System.err.println("Set "+name+"="+value); |
| } |
| |
| public Object resolveVariable(QName qName) |
| { |
| return get(qName, null, 1, 1); |
| } |
| |
| public String toString() |
| { |
| StringBuffer buf = new StringBuffer(); |
| boolean next = false; |
| Collection seen = new HashSet(); |
| Map wctx = (Map) withParameters.getFirst(); |
| buf.append('('); |
| for (Iterator i = wctx.entrySet().iterator(); i.hasNext(); ) |
| { |
| if (next) |
| { |
| buf.append(','); |
| } |
| else |
| { |
| next = true; |
| } |
| Map.Entry entry = (Map.Entry) i.next(); |
| Object key = entry.getKey(); |
| if (!seen.contains(key)) |
| { |
| buf.append(key); |
| buf.append('='); |
| buf.append(entry.getValue()); |
| seen.add(key); |
| } |
| } |
| buf.append(')'); |
| next = false; |
| seen.clear(); |
| buf.append('{'); |
| for (Iterator i = variables.iterator(); i.hasNext(); ) |
| { |
| Map ctx = (Map) i.next(); |
| for (Iterator j = ctx.entrySet().iterator(); j.hasNext(); ) |
| { |
| if (next) |
| { |
| buf.append(','); |
| } |
| else |
| { |
| next = true; |
| } |
| Map.Entry entry = (Map.Entry) j.next(); |
| Object key = entry.getKey(); |
| if (!seen.contains(key)) |
| { |
| buf.append(key); |
| buf.append('='); |
| buf.append(entry.getValue()); |
| seen.add(key); |
| } |
| } |
| } |
| buf.append('}'); |
| next = false; |
| seen.clear(); |
| buf.append('['); |
| for (Iterator i = parameters.iterator(); i.hasNext(); ) |
| { |
| Map ctx = (Map) i.next(); |
| for (Iterator j = ctx.entrySet().iterator(); j.hasNext(); ) |
| { |
| if (next) |
| { |
| buf.append(','); |
| } |
| else |
| { |
| next = true; |
| } |
| Map.Entry entry = (Map.Entry) j.next(); |
| Object key = entry.getKey(); |
| if (!seen.contains(key)) |
| { |
| buf.append(key); |
| buf.append('='); |
| buf.append(entry.getValue()); |
| seen.add(key); |
| } |
| } |
| } |
| buf.append(']'); |
| return buf.toString(); |
| } |
| |
| } |
