93 lines
2.6 KiB
Java
93 lines
2.6 KiB
Java
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package com.moparisthebest.jdbc;
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import java.sql.Connection;
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import java.util.*;
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/**
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* Created by mopar on 4/29/15.
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*/
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public class BindInList implements InList {
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private static final int defaultMaxSize = Integer.parseInt(System.getProperty("QueryMapper.BindInList.defaultMaxSize", "999"));
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private static final InList instance = new BindInList();
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public static InList instance() {
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return instance;
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}
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private final int maxSize;
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public BindInList(final int maxSize) {
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this.maxSize = maxSize;
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}
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protected BindInList() {
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this(defaultMaxSize);
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}
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private static <T> List<List<T>> split(final List<T> list, final int maxLength) {
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final int listSize = list.size();
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final List<List<T>> ret = new ArrayList<List<T>>();
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if (listSize < maxLength)
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ret.add(list);
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else
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for (int fromIndex = 0, toIndex = maxLength; fromIndex < listSize; fromIndex = toIndex, toIndex += maxLength)
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ret.add(list.subList(fromIndex, toIndex > listSize ? listSize : toIndex));
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return ret;
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}
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private <T> String toInList(final String fieldName, final Collection<T> items) {
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final StringBuilder sb = new StringBuilder("(");
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// do it quick if it will fit in one in-list
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if (items.size() < maxSize) // 999 or less
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return buildInList(items, sb, fieldName).append(")").toString();
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// else we need to split lists
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boolean notFirst = false;
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for (final List<T> item : split(new ArrayList<T>(items), maxSize)) {
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if (notFirst) sb.append(" OR ");
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else notFirst = true;
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buildInList(item, sb, fieldName);
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}
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return sb.append(")").toString();
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}
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private static <T> StringBuilder buildInList(Iterable<T> list, StringBuilder sb, String fieldName) {
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return oracleCommaSeparatedList(list, sb.append(fieldName).append(" IN (")).append(")");
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}
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private static <T> StringBuilder oracleCommaSeparatedList(Iterable<T> list, StringBuilder sb) {
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boolean notFirst = false;
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for (final T obj : list) {
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// DO NOT DO THIS ANYMORE: if (obj == null) continue;
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if (notFirst) sb.append(',');
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else notFirst = true;
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sb.append('?');
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}
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return sb;
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}
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public <T> InListObject inList(final Connection conn, final String columnName, final Collection<T> values) {
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return values == null || values.isEmpty() ? InListObject.empty : new BindInListObject(
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toInList(columnName, values),
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values.toArray()
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);
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}
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class BindInListObject extends InListObject {
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private final Object[] bindObjects;
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public BindInListObject(final String sql, final Object[] bindObjects) {
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super(sql);
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this.bindObjects = bindObjects;
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}
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public Object[] getBindObjects() {
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return bindObjects;
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}
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}
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}
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