/*
* Copyright 2011 JBoss, by Red Hat, Inc
*
* 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.builder.impl;
import org.jboss.errai.codegen.BlockStatement;
import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.InnerClass;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.builder.BlockBuilder;
import org.jboss.errai.codegen.builder.BuildCallback;
import org.jboss.errai.codegen.meta.MetaClass;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* @author Mike Brock <cbrock@redhat.com>
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class BlockBuilderImpl<T> implements BlockBuilder<T> {
protected final BlockStatement blockStatement;
protected final BuildCallback<T> callback;
public BlockBuilderImpl() {
this(null);
}
public BlockBuilderImpl(final BuildCallback<T> callback) {
this(new BlockStatement(), callback);
}
public BlockBuilderImpl(final BlockStatement blockStatement, final BuildCallback<T> callback) {
this.blockStatement = blockStatement;
this.callback = callback;
}
@Override
public void insertBefore(final Statement stmt) {
this.blockStatement.insertBefore(stmt);
}
@Override
public void insertBefore(final InnerClass innerClass) {
insertBefore(new Statement() {
@Override
public String generate(final Context context) {
return innerClass.generate(context);
}
@Override
public MetaClass getType() {
return innerClass.getType();
}
});
}
@Override
public BlockBuilder<T> append(final Statement statement) {
blockStatement.addStatement(statement);
return this;
}
@Override
public BlockBuilder<T> append(final InnerClass innerClass) {
blockStatement.addStatement(new Statement() {
@Override
public String generate(final Context context) {
return innerClass.generate(context);
}
@Override
public MetaClass getType() {
return innerClass.getType();
}
});
return this;
}
@Override
public BlockBuilder<T> _(final Statement stmt) {
return append(stmt);
}
@Override
public BlockBuilder<T> _(final InnerClass innerClass) {
return append(innerClass);
}
@Override
public List<Statement> splitFrom(final Statement statement) {
final List<Statement> statements = blockStatement.getStatements();
final int index = statements.indexOf(statement);
if (index > 0) {
final List<Statement> split = new ArrayList<Statement>(statements.subList(index, statements.size()));
statements.removeAll(split);
return split;
}
else {
return Collections.emptyList();
}
}
@Override
public Statement peek() {
final List<Statement> statements = blockStatement.getStatements();
return statements.isEmpty() ? null : statements.get(statements.size() - 1);
}
@Override
public Iterator<Statement> iterator() {
return blockStatement.getStatements().iterator();
}
@Override
public T finish() {
if (callback != null) {
return callback.callback(blockStatement);
}
return null;
}
}