| /* |
| * 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. |
| */ |
| |
| /* |
| * 22 October 1999: This class added by Holger Arendt. |
| */ |
| |
| package freemarker.core; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import freemarker.template.TemplateException; |
| import freemarker.template.TemplateMethodModel; |
| import freemarker.template.TemplateMethodModelEx; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.utility.NullWriter; |
| |
| |
| /** |
| * A unary operator that calls a TemplateMethodModel. It associates with the |
| * <tt>Identifier</tt> or <tt>Dot</tt> to its left. |
| */ |
| final class MethodCall extends Expression { |
| |
| private final Expression target; |
| private final ListLiteral arguments; |
| |
| MethodCall(Expression target, ArrayList arguments) { |
| this(target, new ListLiteral(arguments)); |
| } |
| |
| private MethodCall(Expression target, ListLiteral arguments) { |
| this.target = target; |
| this.arguments = arguments; |
| } |
| |
| @Override |
| TemplateModel _eval(Environment env) throws TemplateException { |
| TemplateModel targetModel = target.eval(env); |
| if (targetModel instanceof TemplateMethodModel) { |
| TemplateMethodModel targetMethod = (TemplateMethodModel) targetModel; |
| List argumentStrings = |
| targetMethod instanceof TemplateMethodModelEx |
| ? arguments.getModelList(env) |
| : arguments.getValueList(env); |
| Object result = targetMethod.exec(argumentStrings); |
| return env.getObjectWrapper().wrap(result); |
| } else if (targetModel instanceof Macro) { |
| Macro func = (Macro) targetModel; |
| env.setLastReturnValue(null); |
| if (!func.isFunction()) { |
| throw new _MiscTemplateException(env, "A macro cannot be called in an expression. (Functions can be.)"); |
| } |
| Writer prevOut = env.getOut(); |
| try { |
| env.setOut(NullWriter.INSTANCE); |
| env.invoke(func, null, arguments.items, null, null); |
| } catch (IOException e) { |
| // Should not occur |
| throw new TemplateException("Unexpected exception during function execution", e, env); |
| } finally { |
| env.setOut(prevOut); |
| } |
| return env.getLastReturnValue(); |
| } else { |
| throw new NonMethodException(target, targetModel, env); |
| } |
| } |
| |
| @Override |
| public String getCanonicalForm() { |
| StringBuilder buf = new StringBuilder(); |
| buf.append(target.getCanonicalForm()); |
| buf.append("("); |
| String list = arguments.getCanonicalForm(); |
| buf.append(list.substring(1, list.length() - 1)); |
| buf.append(")"); |
| return buf.toString(); |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| return "...(...)"; |
| } |
| |
| TemplateModel getConstantValue() { |
| return null; |
| } |
| |
| @Override |
| boolean isLiteral() { |
| return false; |
| } |
| |
| @Override |
| protected Expression deepCloneWithIdentifierReplaced_inner( |
| String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| return new MethodCall( |
| target.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState), |
| (ListLiteral) arguments.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState)); |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 1 + arguments.items.size(); |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| if (idx == 0) { |
| return target; |
| } else if (idx < getParameterCount()) { |
| return arguments.items.get(idx - 1); |
| } else { |
| throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| if (idx == 0) { |
| return ParameterRole.CALLEE; |
| } else if (idx < getParameterCount()) { |
| return ParameterRole.ARGUMENT_VALUE; |
| } else { |
| throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| } |