net.hasor.db.lambda.segment.MergeSqlSegment Maven / Gradle / Ivy
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/*
* Copyright 2002-2005 the original author or authors.
*
* 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 net.hasor.db.lambda.segment;
import net.hasor.utils.StringUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* 提供多个 Segment 汇聚成为一个的工具。
* @version : 2020-10-31
* @author 赵永春 ([email protected])
*/
public final class MergeSqlSegment implements Segment {
private final List segments = new ArrayList<>();
public MergeSqlSegment(List segments) {
this.segments.addAll(segments);
}
public MergeSqlSegment(Segment... segments) {
this.segments.addAll(Arrays.asList(segments));
}
public void addSegment(Segment... segmentArrays) {
if (segmentArrays != null) {
this.segments.addAll(Arrays.asList(segmentArrays));
}
}
@Override
public String getSqlSegment() {
return this.getSqlSegment(this.segments);
}
public MergeSqlSegment sub(int form) {
return new MergeSqlSegment(this.segments.subList(form, this.segments.size()));
}
public String noFirstSqlSegment() {
return this.getSqlSegment(this.segments.subList(1, this.segments.size()));
}
private String getSqlSegment(List dataList) {
StringBuilder strBuilder = new StringBuilder("");
for (Segment segment : dataList) {
String str = segment.getSqlSegment();
if (StringUtils.isNotBlank(str)) {
strBuilder.append(str).append(" ");
} else {
strBuilder.append(" ");
}
}
return strBuilder.toString().trim();
}
public boolean isEmpty() {
return this.segments.isEmpty();
}
public Segment firstSqlSegment() {
if (this.segments.isEmpty()) {
return null;
} else {
Segment segment = segments.get(0);
if (segment instanceof MergeSqlSegment) {
return ((MergeSqlSegment) segment).firstSqlSegment();
} else {
return segment;
}
}
}
}