From 26b01b500065634eb3133dc354a0ba71b13bff56 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Wed, 7 Aug 2013 23:53:53 +0200
Subject: wip o Start of JPA implementation.

---
 .../java/io/trygvis/persistence/sql/SqlQuery.java  | 249 +++++++++++++++++++++
 1 file changed, 249 insertions(+)
 create mode 100644 sql-persistence/src/main/java/io/trygvis/persistence/sql/SqlQuery.java

(limited to 'sql-persistence/src/main/java/io/trygvis/persistence/sql/SqlQuery.java')

diff --git a/sql-persistence/src/main/java/io/trygvis/persistence/sql/SqlQuery.java b/sql-persistence/src/main/java/io/trygvis/persistence/sql/SqlQuery.java
new file mode 100644
index 0000000..b50b56e
--- /dev/null
+++ b/sql-persistence/src/main/java/io/trygvis/persistence/sql/SqlQuery.java
@@ -0,0 +1,249 @@
+package io.trygvis.persistence.sql;
+
+import javax.persistence.FlushModeType;
+import javax.persistence.LockModeType;
+import javax.persistence.NoResultException;
+import javax.persistence.NonUniqueResultException;
+import javax.persistence.Parameter;
+import javax.persistence.PersistenceException;
+import javax.persistence.TemporalType;
+import javax.persistence.TypedQuery;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static java.util.Collections.emptyMap;
+
+public class SqlQuery<T> implements TypedQuery<T> {
+    private final FromResultSet<T> fromResultSet;
+    private final SqlExecutor executor;
+    private final String sql;
+
+    private final boolean isSqlFinal;
+    private int maxResults = -1;
+    private int firstResult = -1;
+
+    public SqlQuery(FromResultSet<T> fromResultSet, SqlExecutor executor, String sql, boolean sqlFinal) {
+        this.fromResultSet = fromResultSet;
+        this.executor = executor;
+        this.sql = sql;
+        this.isSqlFinal = sqlFinal;
+    }
+
+    @Override
+    public List<T> getResultList() {
+        return getResultList(firstResult, maxResults);
+    }
+
+    @Override
+    public T getSingleResult() {
+        List<T> list = getResultList(0, 2);
+        if (list.size() == 1) {
+            return list.get(0);
+        }
+
+        if (list.size() == 0) {
+            throw new NoResultException();
+        }
+
+        throw new NonUniqueResultException();
+    }
+
+    public List<T> getResultList(int offset, int limit) {
+        final String sql = generateSql(this.sql, offset, limit);
+        return executor.executeQuery(new SqlExecutor.QueryCommand<T>() {
+            @Override
+            public List<T> run(Connection c) throws SQLException {
+                List<T> list = new ArrayList<>();
+                try (Statement stmt = c.createStatement()) {
+                    ResultSet rs = stmt.executeQuery(sql);
+                    while (rs.next()) {
+                        T t = fromResultSet.fromResultSet(rs);
+                        list.add(t);
+                    }
+                }
+                return list;
+            }
+        });
+    }
+
+    private static String generateSql(String sql, int offset, int limit) {
+        if (offset > 0) {
+            sql += " OFFSET " + offset;
+        }
+        if (limit > 0) {
+            sql += " LIMIT " + limit;
+        }
+
+        return sql;
+    }
+
+    @Override
+    public int executeUpdate() {
+        return executor.executeUpdate(new SqlExecutor.UpdateCommand() {
+            @Override
+            public int run(Connection c) throws SQLException {
+                try (Statement stmt = c.createStatement()) {
+                    return stmt.executeUpdate(sql);
+                }
+            }
+        });
+    }
+
+    @Override
+    public SqlQuery<T> setMaxResults(int maxResult) {
+        if (maxResult <= 0) {
+            throw new IllegalArgumentException("maxResult has to be positive: " + maxResult);
+        }
+        this.maxResults = maxResult;
+        return this;
+    }
+
+    @Override
+    public int getMaxResults() {
+        return maxResults;
+    }
+
+    @Override
+    public SqlQuery<T> setFirstResult(int startPosition) {
+        this.firstResult = startPosition;
+        return this;
+    }
+
+    @Override
+    public int getFirstResult() {
+        return firstResult;
+    }
+
+    @Override
+    public SqlQuery<T> setHint(String hintName, Object value) {
+        return null;
+    }
+
+    @Override
+    public Map<String, Object> getHints() {
+        return emptyMap();
+    }
+
+    @Override
+    public <A> SqlQuery<T> setParameter(Parameter<A> param, A value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(Parameter<Calendar> param, Calendar value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(Parameter<Date> param, Date value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(String name, Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(String name, Calendar value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(String name, Date value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(int position, Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(int position, Calendar value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setParameter(int position, Date value, TemporalType temporalType) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<Parameter<?>> getParameters() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Parameter<?> getParameter(String name) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public <T> Parameter<T> getParameter(String name, Class<T> type) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Parameter<?> getParameter(int position) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public <T> Parameter<T> getParameter(int position, Class<T> type) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean isBound(Parameter<?> param) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public <T> T getParameterValue(Parameter<T> param) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Object getParameterValue(String name) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Object getParameterValue(int position) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setFlushMode(FlushModeType flushMode) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public FlushModeType getFlushMode() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SqlQuery<T> setLockMode(LockModeType lockMode) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public LockModeType getLockMode() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public <T> T unwrap(Class<T> klass) {
+        throw new PersistenceException("Unsupported class: " + klass);
+    }
+}
-- 
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