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Posted to commits@commons.apache.org by si...@apache.org on 2011/01/27 18:24:53 UTC
svn commit: r1064214 -
/commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java
Author: simonetripodi
Date: Thu Jan 27 17:24:53 2011
New Revision: 1064214
URL: http://svn.apache.org/viewvc?rev=1064214&view=rev
Log:
first checkin of VariableAttributes class, a tidy version of the proper one on /trunk
Added:
commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java (with props)
Added: commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java
URL: http://svn.apache.org/viewvc/commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java?rev=1064214&view=auto
==============================================================================
--- commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java (added)
+++ commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java Thu Jan 27 17:24:53 2011
@@ -0,0 +1,167 @@
+/* $Id$
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.digester3.substitution;
+
+import org.xml.sax.Attributes;
+
+import java.util.ArrayList;
+
+/**
+ * Wrapper for an org.xml.sax.Attributes object which expands any
+ * "variables" referenced in the attribute value via ${foo} or similar.
+ * This is only done when something actually asks for the attribute value,
+ * thereby imposing no performance penalty if the attribute is not used.
+ */
+public class VariableAttributes implements Attributes {
+
+ // list of mapped attributes.
+ private final ArrayList<String> values = new ArrayList<String>(10);
+
+ private Attributes attrs;
+
+ private VariableExpander expander;
+
+ /**
+ * Specify which attributes class this object is a proxy for.
+ */
+ public void init(Attributes attrs, VariableExpander expander) {
+ this.attrs = attrs;
+ this.expander = expander;
+
+ // I hope this doesn't release the memory for this array; for
+ // efficiency, this should just mark the array as being size 0.
+ this.values.clear();
+ }
+
+ public String getValue(int index) {
+ if (index >= this.values.size()) {
+ // Expand the values array with null elements, so the later
+ // call to set(index, s) works ok.
+ //
+ // Unfortunately, there is no easy way to set the size of
+ // an arraylist; we must repeatedly add null elements to it..
+ this.values.ensureCapacity(index+1);
+ for(int i = this.values.size(); i<= index; ++i) {
+ this.values.add(null);
+ }
+ }
+
+ String s = this.values.get(index);
+
+ if (s == null) {
+ // we have never been asked for this value before.
+ // get the real attribute value and perform substitution
+ // on it.
+ s = this.attrs.getValue(index);
+ if (s != null) {
+ s = this.expander.expand(s);
+ this.values.set(index, s);
+ }
+ }
+
+ return s;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getValue(String qname) {
+ int index = this.attrs.getIndex(qname);
+ if (index == -1) {
+ return null;
+ }
+ return getValue(index);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getValue(String uri, String localname) {
+ int index = this.attrs.getIndex(uri, localname);
+ if (index == -1) {
+ return null;
+ }
+ return getValue(index);
+ }
+
+ // plain proxy methods follow : nothing interesting :-)
+
+ /**
+ * {@inheritDoc}
+ */
+ public int getIndex(String qname) {
+ return attrs.getIndex(qname);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public int getIndex(String uri, String localpart) {
+ return attrs.getIndex(uri, localpart);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public int getLength() {
+ return attrs.getLength();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getLocalName(int index) {
+ return attrs.getLocalName(index);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getQName(int index) {
+ return attrs.getQName(index);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getType(int index) {
+ return attrs.getType(index);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getType(String qname) {
+ return attrs.getType(qname);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getType(String uri, String localname) {
+ return attrs.getType(uri, localname);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public String getURI(int index) {
+ return attrs.getURI(index);
+ }
+
+}
Propchange: commons/sandbox/digester3/trunk/src/main/java/org/apache/commons/digester3/substitution/VariableAttributes.java
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