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Diffstat (limited to 'libjava/gnu/xml/transform/Bindings.java')
| -rw-r--r-- | libjava/gnu/xml/transform/Bindings.java | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/libjava/gnu/xml/transform/Bindings.java b/libjava/gnu/xml/transform/Bindings.java new file mode 100644 index 0000000..f898a72 --- /dev/null +++ b/libjava/gnu/xml/transform/Bindings.java @@ -0,0 +1,246 @@ +/* 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., 59 Temple Place, Suite 330, Boston, MA +02111-1307 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.transform.TransformerException; +import javax.xml.xpath.XPathVariableResolver; +import org.w3c.dom.Document; +import org.w3c.dom.DocumentFragment; +import org.w3c.dom.Node; +import gnu.xml.xpath.Expr; + +/** + * 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 +{ + + final Stylesheet stylesheet; + + /** + * Global variables. + */ + final LinkedList variables; + + /** + * Parameter value stack. + */ + final LinkedList parameters; + + Bindings(Stylesheet stylesheet) + { + this.stylesheet = stylesheet; + variables = new LinkedList(); + parameters = new LinkedList(); + push(true); + push(false); + } + + public Object clone() + { + try + { + return (Bindings) super.clone(); + } + catch (CloneNotSupportedException e) + { + throw new Error(e.getMessage()); + } + } + + void push(boolean global) + { + if (global) + { + variables.addFirst(new HashMap()); + } + else + { + parameters.addFirst(new HashMap()); + } + } + + void pop(boolean global) + { + if (global) + { + variables.removeFirst(); + } + else + { + parameters.removeFirst(); + } + } + + public boolean containsKey(String name, boolean global) + { + Iterator i = global ? variables.iterator() : parameters.iterator(); + while (i.hasNext()) + { + Map ctx = (Map) i.next(); + if (ctx.containsKey(name)) + { + return true; + } + } + return false; + } + + public Object get(String name, Node context, int pos, int len) + { + //System.err.println("bindings.get: "+name); + //System.err.println("\t"+toString()); + Object ret = null; + for (Iterator i = variables.iterator(); i.hasNext() && ret == null; ) + { + Map vctx = (Map) i.next(); + ret = vctx.get(name); + } + if (ret == null) + { + for (Iterator i = parameters.iterator(); i.hasNext() && ret == null; ) + { + Map pctx = (Map) i.next(); + ret = pctx.get(name); + } + } + /*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(String name, Object value, boolean global) + { + if (global) + { + Map context = (Map) variables.getFirst(); + context.put(name, value); + } + else + { + Map context = (Map) parameters.getFirst(); + context.put(name, value); + } + } + + public Object resolveVariable(QName qName) + { + return get(qName.toString(), null, 1, 1); + } + + public String toString() + { + StringBuffer buf = new StringBuffer(); + boolean next = false; + Collection seen = new HashSet(); + 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); + } + } + } + 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(); + } +} |