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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* 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 com.iciql.util;
/**
* A utility class to build a statement. In addition to the methods supported by
* StringBuilder, it allows to add a text only in the second iteration. This
* simplified constructs such as:
*
* <pre>
* StringBuilder buff = new StringBuilder();
* for (int i = 0; i < args.length; i++) {
* if (i > 0) {
* buff.append(", ");
* }
* buff.append(args[i]);
* }
* </pre>
*
* to
*
* <pre>
* StatementBuilder buff = new StatementBuilder();
* for (String s : args) {
* buff.appendExceptFirst(", ");
* buff.append(a);
* }
* </pre>
*/
public class StatementBuilder {
private final StringBuilder builder = new StringBuilder();
private int index;
/**
* Create a new builder.
*/
public StatementBuilder() {
// nothing to do
}
/**
* Create a new builder.
*
* @param string
* the initial string
*/
public StatementBuilder(String string) {
builder.append(string);
}
/**
* Append a text.
*
* @param s
* the text to append
* @return itself
*/
public StatementBuilder append(String s) {
builder.append(s);
return this;
}
/**
* Append a character.
*
* @param c
* the character to append
* @return itself
*/
public StatementBuilder append(char c) {
builder.append(c);
return this;
}
/**
* Append a number.
*
* @param x
* the number to append
* @return itself
*/
public StatementBuilder append(long x) {
builder.append(x);
return this;
}
/**
* Returns the current value of the loop counter.
* @return the loop counter
*/
public int getCount() {
return index;
}
/**
* Reset the loop counter.
*
* @return itself
*/
public StatementBuilder resetCount() {
index = 0;
return this;
}
/**
* Append a text, but only if appendExceptFirst was never called.
*
* @param s
* the text to append
*/
public void appendOnlyFirst(String s) {
if (index == 0) {
builder.append(s);
}
}
/**
* Append a text, except when this method is called the first time.
*
* @param s
* the text to append
*/
public void appendExceptFirst(String s) {
if (index++ > 0) {
builder.append(s);
}
}
public void append(StatementBuilder sb) {
builder.append(sb);
}
public void insert(int offset, char c) {
builder.insert(offset, c);
}
public String toString() {
return builder.toString();
}
/**
* Get the length.
*
* @return the length
*/
public int length() {
return builder.length();
}
}
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