/*
* 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.cocoon.template.expression;
import java.io.CharArrayReader;
import java.io.Reader;
import java.io.StringReader;
import java.util.Iterator;
import java.util.List;
import org.apache.cocoon.components.expression.ExpressionContext;
import org.apache.cocoon.template.environment.ErrorHolder;
import org.apache.cocoon.template.environment.ParsingContext;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @version $Id: Substitutions.java 449189 2006-09-23 06:52:29Z crossley $
*/
public class Substitutions {
final private List substitutions;
final private boolean hasSubstitutions;
public Substitutions(ParsingContext parsingContext, Locator location, String stringTemplate) throws SAXException {
this(parsingContext, location, new StringReader(stringTemplate));
}
public Substitutions(ParsingContext parsingContext, Locator location, char[] chars, int start, int length)
throws SAXException {
this(parsingContext, location, new CharArrayReader(chars, start, length));
}
private Substitutions(ParsingContext parsingContext, Locator location, Reader in) throws SAXException {
this.substitutions = parsingContext.getStringTemplateParser().parseSubstitutions( in, "", location );
this.hasSubstitutions = !substitutions.isEmpty();
}
public boolean hasSubstitutions() {
return this.hasSubstitutions;
}
public Iterator iterator() {
return this.substitutions.iterator();
}
public int size() {
return this.substitutions.size();
}
public Object get(int pos) {
return this.substitutions.get(pos);
}
public String toString(Locator location, ExpressionContext expressionContext) throws SAXException {
StringBuffer buf = new StringBuffer();
Iterator iterSubst = iterator();
while (iterSubst.hasNext()) {
Subst subst = (Subst) iterSubst.next();
if (subst instanceof Literal) {
Literal lit = (Literal) subst;
buf.append(lit.getValue());
} else if (subst instanceof JXTExpression) {
JXTExpression expr = (JXTExpression) subst;
Object val;
try {
val = expr.getValue(expressionContext);
} catch (Exception e) {
throw new SAXParseException(e.getMessage(), location, e);
} catch (Error err) {
throw new SAXParseException(err.getMessage(), location, new ErrorHolder(err));
}
buf.append(val != null ? val.toString() : "");
}
}
return buf.toString();
}
}