org.yx.db.sql.token.StringTokenParser Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of sumk Show documentation

A quick developing framewort for internet company

There is a newer version: 4.0.2

/**
 * Copyright (C) 2016 - 2030 youtongluan.
 *
 * 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.yx.db.sql.token;

public class StringTokenParser {

	private final String openToken;
	private final String closeToken;
	private final TokenHandler handler;

	public StringTokenParser(String openToken, String closeToken, TokenHandler handler) {
		this.openToken = openToken;
		this.closeToken = closeToken;
		this.handler = handler;
	}

	public String parse(String text) {
		StringBuilder builder = new StringBuilder();
		if (text != null && text.length() > 0) {
			char[] src = text.toCharArray();
			int offset = 0;
			int start = text.indexOf(openToken, offset);
			while (start > -1) {
				if (start > 0 && src[start - 1] == '\\') {

					builder.append(src, offset, start - offset - 1).append(openToken);
					offset = start + openToken.length();
				} else {
					int end = text.indexOf(closeToken, start);
					if (end == -1) {
						builder.append(src, offset, src.length - offset);
						offset = src.length;
					} else {
						builder.append(src, offset, start - offset);
						offset = start + openToken.length();
						String content = new String(src, offset, end - offset);
						String value = handler.handleToken(content);
						builder.append(value != null ? value : this.openToken + content + this.closeToken);
						offset = end + closeToken.length();
					}
				}
				start = text.indexOf(openToken, offset);
			}
			if (offset < src.length) {
				builder.append(src, offset, src.length - offset);
			}
		}
		return builder.toString();
	}

	public static interface TokenHandler {

		String handleToken(String content);
	}
}