com.blazebit.persistence.impl.builder.expression.EscapeBuilderImpl Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* 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.blazebit.persistence.impl.builder.expression;
import com.blazebit.persistence.EscapeBuilder;
import com.blazebit.persistence.impl.BuilderChainingException;
/**
*
* @author Moritz Becker
* @since 1.0.0
*/
public class EscapeBuilderImpl implements EscapeBuilder {
private final EscapeBuilderImplEndedListener listener;
private final T result;
private Character escapeCharacter;
public EscapeBuilderImpl(EscapeBuilderImplEndedListener listener, T result) {
this.listener = listener;
this.result = result;
}
@Override
public T escape(char c) {
escapeCharacter = c;
listener.onBuilderEnded(this);
return result;
}
@Override
public T noEscape() {
listener.onBuilderEnded(this);
return result;
}
public Character getEscapeCharacter() {
return escapeCharacter;
}
/**
* @author Moritz Becker
* @since 1.0.0
*/
public static class EscapeBuilderImplEndedListener {
private EscapeBuilderImpl currentBuilder;
public void verifyBuilderEnded() {
if (currentBuilder != null) {
throw new BuilderChainingException("A builder was not ended properly.");
}
}
public > T startBuilder(T builder) {
if (currentBuilder != null) {
throw new BuilderChainingException("There was an attempt to start a builder but a previous builder was not ended.");
}
currentBuilder = builder;
return builder;
}
public void onBuilderEnded(EscapeBuilderImpl builder) {
if (currentBuilder == null) {
throw new BuilderChainingException("There was an attempt to end a builder that was not started or already closed.");
}
currentBuilder = null;
}
}
}