/*
* Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
*
* 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.
*/
package org.jboss.errai.codegen;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.jboss.errai.codegen.builder.ClosedBlock;
import org.jboss.errai.codegen.util.EmptyStatement;
/**
* Represents a code block (e.g. a loop body).
*
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class BlockStatement extends AbstractStatement {
public static final BlockStatement EMPTY_BLOCK = new BlockStatement() {
@Override
public BlockStatement addStatement(final Statement statement) {
throw new UnsupportedOperationException("this is an immutable object");
}
@Override
public void insertBefore(final Statement statement) {
throw new UnsupportedOperationException("this is an immutable object");
}
};
private final List<Statement> statements = new ArrayList<Statement>(20);
public BlockStatement(final Statement... statements) {
if (statements != null) {
for (final Statement statement : statements) {
if (statement != null)
this.statements.add(statement);
}
}
}
public BlockStatement addStatement(final Statement statement) {
if (statement != null)
statements.add(statement);
return this;
}
public BlockStatement addAllStatements(final Collection<Statement> stmts) {
if (statements != null)
statements.addAll(stmts);
return this;
}
public void insertBefore(final Statement statement) {
if (statement != null) {
final int pos = statements.size() == 0 ? 0 : statements.size() - 1;
statements.add(pos, statement);
}
}
String generatedCache;
@Override
public String generate(final Context context) {
if (generatedCache != null) return generatedCache;
final StringBuilder buf = new StringBuilder(512);
boolean isLastBlock = false;
for (final Statement statement : statements) {
if (buf.length() != 0 && !(statement instanceof EmptyStatement)) {
buf.append("\n");
}
buf.append(statement.generate(context));
if (!(statement instanceof Comment) && !(statement instanceof EmptyStatement)
&& !buf.toString().endsWith(";") && !buf.toString().endsWith(":") && !buf.toString().endsWith("}")) {
buf.append(";");
}
isLastBlock = statement instanceof ClosedBlock;
}
if (buf.length() != 0 && buf.charAt(buf.length() - 1) != ';' && !isLastBlock) {
buf.append(';');
}
return generatedCache = buf.toString();
}
/**
* Returns a <b>mutable</b> representation of the statements in this block. Changes to the List returned by this
* method <b>will</b> be reflected in the state of this method when the code is generated.
*
* @return a list representing the underlying set of statements in this block.
*/
public List<Statement> getStatements() {
return statements;
}
public boolean isEmpty() {
return statements.isEmpty();
}
}