--- /dev/null
+/* 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;
+
+ 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)
+ {
+ 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)
+ {
+ //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();
+ }
+
+}
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