/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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;
}
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.");
}
Writer prevOut = env.getOut();
try {
env.setOut(NullWriter.INSTANCE);
env.visit(func, null, arguments.items, null, null);
} catch (IOException ioe) {
throw new InternalError("This should be impossible.");
} finally {
env.setOut(prevOut);
}
return env.getLastReturnValue();
}
else {
throw new NonMethodException(target, targetModel, env);
}
}
public String getCanonicalForm() {
StringBuffer buf = new StringBuffer();
buf.append(target.getCanonicalForm());
buf.append("(");
String list = arguments.getCanonicalForm();
buf.append(list.substring(1, list.length() -1));
buf.append(")");
return buf.toString();
}
String getNodeTypeSymbol() {
return "...(...)";
}
TemplateModel getConstantValue() {
return null;
}
boolean isLiteral() {
return false;
}
protected Expression deepCloneWithIdentifierReplaced_inner(
String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
return new MethodCall(
target.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState),
(ListLiteral)arguments.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState));
}
int getParameterCount() {
return 1 + arguments.items.size();
}
Object getParameterValue(int idx) {
if (idx == 0) {
return target;
} else if (idx < getParameterCount()) {
return arguments.items.get(idx - 1);
} else {
throw new IndexOutOfBoundsException();
}
}
ParameterRole getParameterRole(int idx) {
if (idx == 0) {
return ParameterRole.CALLEE;
} else if (idx < getParameterCount()) {
return ParameterRole.ARGUMENT_VALUE;
} else {
throw new IndexOutOfBoundsException();
}
}
}