/*
* 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.instruction;
import java.util.Stack;
import org.apache.cocoon.el.objectmodel.ObjectModel;
import org.apache.cocoon.el.parsing.Subst;
import org.apache.cocoon.template.environment.ErrorHolder;
import org.apache.cocoon.template.environment.ParsingContext;
import org.apache.cocoon.template.expression.JXTExpression;
import org.apache.cocoon.template.script.event.AttributeEvent;
import org.apache.cocoon.template.script.event.CopyAttribute;
import org.apache.cocoon.template.script.event.StartElement;
import org.apache.cocoon.template.script.event.SubstituteAttribute;
import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @version SVN $Id: ParameterInstance.java 568906 2007-08-23 09:40:59Z cziegeler $
*/
public class ParameterInstance extends Instruction {
final String name;
private final Object value;
public ParameterInstance(ParsingContext parsingContext, StartElement raw, Attributes attrs, Stack stack)
throws SAXException {
super(raw);
Locator locator = getLocation();
if (stack.size() == 0 || !(stack.peek() instanceof Call)) {
throw new SAXParseException("<parameter> not allowed here", locator, null);
} else {
this.name = attrs.getValue("name");
if (this.name == null) {
throw new SAXParseException("parameter: \"name\" is required", locator, null);
}
String val = attrs.getValue("value");
if (val == null)
throw new SAXParseException("parameter: \"value\" is required", locator, null);
this.value = parsingContext.getStringTemplateParser().compileExpr(val, "parameter: \"value\": ", locator);
}
}
public ParameterInstance(AttributeEvent event) {
super((Locator) null);
this.name = event.getLocalName();
this.value = event;
}
public String getName() {
return name;
}
public Object getValue(ObjectModel objectModel) throws SAXException {
if (this.value instanceof Subst)
return getExpressionValue((Subst) this.value, objectModel);
else if (this.value instanceof CopyAttribute) {
CopyAttribute copy = (CopyAttribute) this.value;
return copy.getValue();
} else if (this.value instanceof SubstituteAttribute) {
SubstituteAttribute substEvent = (SubstituteAttribute) this.value;
if (substEvent.getSubstitutions().size() == 1
&& substEvent.getSubstitutions().get(0) instanceof JXTExpression)
return getExpressionValue((Subst) substEvent.getSubstitutions().get(0), objectModel);
else
return substEvent.getSubstitutions().toString(getLocation(), objectModel);
} else {
throw new Error("this shouldn't have happened");
}
}
private Object getExpressionValue(Subst expr, ObjectModel objectModel) throws SAXException {
Object val;
try {
val = expr.getNode(objectModel);
} catch (Exception e) {
throw new SAXParseException(e.getMessage(), getLocation(), e);
} catch (Error err) {
throw new SAXParseException(err.getMessage(), getLocation(), new ErrorHolder(err));
}
return val != null ? val : "";
}
}