| /* |
| * 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.components.expression.ExpressionContext; |
| 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 $Id$ |
| */ |
| 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(ExpressionContext expressionContext) throws SAXException { |
| if (this.value instanceof JXTExpression) |
| return getExpressionValue((JXTExpression) this.value, expressionContext); |
| 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((JXTExpression) substEvent.getSubstitutions().get(0), expressionContext); |
| else |
| return substEvent.getSubstitutions().toString(getLocation(), expressionContext); |
| |
| } else { |
| throw new Error("this shouldn't have happened"); |
| } |
| } |
| |
| private Object getExpressionValue(JXTExpression expr, ExpressionContext expressionContext) throws SAXException { |
| Object val; |
| try { |
| val = expr.getNode(expressionContext); |
| } 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 : ""; |
| } |
| } |