/*
* Copyright 2004-2015 the Seasar Foundation and the Others.
*
* 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.seasar.framework.aop.javassist;
/**
* <code>try</code>ブロックをサポートするためのクラスです。
*
* @author koichik
*/
public class TryBlockSupport {
/**
* try状態です。
*/
protected static final int STATUS_TRY = 0;
/**
* catch状態です。
*/
protected static final int STATUS_CATCH = 1;
/**
* finally状態です。
*/
protected static final int STATUS_FINALLY = 2;
/**
* 状態です。
*/
protected int status;
/**
* コード用のバッファです。
*/
protected StringBuffer codeBuf = new StringBuffer(500);
/**
* {@link TryBlockSupport}を作成します。
*
* @param src
*/
public TryBlockSupport(final String src) {
codeBuf.append("try {").append(src).append("}");
status = STATUS_TRY;
}
/**
* <code>catch</code>ブロックを追加します。
*
* @param exceptionType
* @param src
*/
public void addCatchBlock(final Class exceptionType, final String src) {
if (!Throwable.class.isAssignableFrom(exceptionType)) {
throw new IllegalArgumentException(
"exceptionType must be Throwable.");
}
if (status != STATUS_TRY && status != STATUS_CATCH) {
throw new IllegalStateException(
"could't append catch block after finally block.");
}
codeBuf.append("catch (").append(exceptionType.getName()).append(
" e) {").append(src).append("}");
status = STATUS_CATCH;
}
/**
* <code>finally</code>ブロックを設定します。
*
* @param src
*/
public void setFinallyBlock(final String src) {
if (status != STATUS_TRY && status != STATUS_CATCH) {
throw new IllegalStateException(
"finally block is already appended.");
}
codeBuf.append("finally {").append(src).append("}");
status = STATUS_FINALLY;
}
/**
* 出来上がったソースを返します。
*
* @return 出来上がったソース
*/
public String getSourceCode() {
if (status != STATUS_CATCH && status != STATUS_FINALLY) {
throw new IllegalStateException(
"must set catch block or finally block.");
}
return new String(codeBuf);
}
}