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Java based SQL templating project. Store your queries in *.sql files and build queries for execution. Supports simple expressions and conditional clauses and interface proxying for java-sql bridge.

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package com.jaregu.database.queries;

import static java.util.Objects.requireNonNull;

import java.util.Objects;

import com.jaregu.database.queries.parsing.QueriesSource;

/**
 * SQL source unique identification.
 *
 */
public interface SourceId {

	/**
	 * Returns this source identification string representation
	 * 
	 * @return
	 */
	String getId();

	/**
	 * Using passed (relative to this source) statement identification returns
	 * system wide unique query statement identification
	 * 
	 * @param id
	 * @return
	 */
	QueryId getQueryId(String id);

	/**
	 * Creates source ID representing SQL source based on class resource, see
	 * {@link QueriesSource#ofClass(Class)}
	 * 
	 * @param clazz
	 * @return
	 */
	static SourceId ofClass(Class clazz) {
		return new SourceIdImpl(clazz.getName());
	}

	/**
	 * Creates source ID representing SQL source based on string ID, see
	 * {@link QueriesSource#ofContent(SourceId, java.util.function.Supplier)}
	 * 
	 * @param id
	 * @return
	 */
	static SourceId ofId(String id) {
		return new SourceIdImpl(id);
	}

	/**
	 * Creates source ID representing SQL source based on resource, see
	 * {@link QueriesSource#ofResource(String)}
	 * 
	 * @param resource
	 * @return
	 */
	static SourceId ofResource(String resource) {
		String id = resource.trim();
		id = (id.indexOf('.') > 0 ? id.substring(0, id.lastIndexOf('.')) : id).replace('\\', '.').replace('/', '.');
		while (id.startsWith(".")) {
			id = id.substring(1);
		}
		while (id.endsWith(".")) {
			id = id.substring(0, id.length() - 1);
		}
		return new SourceIdImpl(id);
	}

	static final class SourceIdImpl implements SourceId {

		private final String id;

		public SourceIdImpl(String id) {
			this.id = requireNonNull(id).trim();
			if (this.id.length() == 0) {
				throw new IllegalArgumentException("ID is empty!");
			}
		}

		@Override
		public String getId() {
			return id;
		}

		@Override
		public String toString() {
			return "QueriesSourceId{" + id + "}";
		}

		@Override
		public QueryId getQueryId(String id) {
			return QueryId.of(this, id);
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) {
				return true;
			}
			if (o == null) {
				return false;
			}
			if (!(o instanceof SourceIdImpl)) {
				return false;
			}
			SourceIdImpl sourceId = (SourceIdImpl) o;
			return Objects.equals(this.id, sourceId.id);
		}

		@Override
		public int hashCode() {
			return id.hashCode();
		}
	}
}