/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.openjpa.jdbc.kernel.exps;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.Arguments;
import org.apache.openjpa.kernel.exps.ExpressionVisitor;
import org.apache.openjpa.kernel.exps.Value;
import org.apache.openjpa.meta.ClassMetaData;
/**
* A list of arguments to a multi-argument function.
*
* @author Abe White
*/
public class Args
extends AbstractVal
implements Arguments {
private final Val[] _args;
private ClassMetaData _meta = null;
/**
* Constructor. Supply values being combined.
*/
public Args(Val val1, Val val2) {
this(new Val[]{val1, val2});
}
public Args (Val... values) {
List<Val> list = new ArrayList<Val>();
if (values != null) {
for (Val v : values) {
if (v instanceof Args) {
list.addAll(Arrays.asList(((Args)v)._args));
} else {
list.add(v);
}
}
}
_args = list.toArray(new Val[list.size()]);
}
/**
* Return a filter value for each argument.
*/
public FilterValue[] newFilterValues(Select sel, ExpContext ctx,
ExpState state) {
ArgsExpState astate = (ArgsExpState) state;
FilterValue[] filts = new FilterValue[_args.length];
for (int i = 0; i < _args.length; i++)
filts[i] = new FilterValueImpl(sel, ctx, astate.states[i],
_args[i]);
return filts;
}
public Value[] getValues() {
return _args;
}
public Val[] getVals() {
return _args;
}
public ClassMetaData getMetaData() {
return _meta;
}
public void setMetaData(ClassMetaData meta) {
_meta = meta;
}
public boolean isVariable() {
return false;
}
public Class getType() {
return Object[].class;
}
public Class[] getTypes() {
Class[] c = new Class[_args.length];
for (int i = 0; i < _args.length; i++)
c[i] = _args[i].getType();
return c;
}
public void setImplicitType(Class type) {
}
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
ExpState[] states = new ExpState[_args.length];
Joins joins = null;
for (int i = 0; i < _args.length; i++) {
states[i] = _args[i].initialize(sel, ctx, flags);
if (joins == null)
joins = states[i].joins;
else
joins = sel.and(joins, states[i].joins);
}
return new ArgsExpState(joins, states);
}
/**
* Expression state.
*/
private static class ArgsExpState
extends ExpState {
public ExpState[] states;
public ArgsExpState(Joins joins, ExpState[] states) {
super(joins);
this.states = states;
}
}
public void select(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
ArgsExpState astate = (ArgsExpState) state;
for (int i = 0; i < _args.length; i++)
_args[i].selectColumns(sel, ctx, astate.states[i], pks);
}
public void groupBy(Select sel, ExpContext ctx, ExpState state) {
}
public void orderBy(Select sel, ExpContext ctx, ExpState state,
boolean asc) {
}
public Object load(ExpContext ctx, ExpState state, Result res) {
return null;
}
public void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState) {
ArgsExpState astate = (ArgsExpState) state;
for (int i = 0; i < _args.length; i++)
_args[i].calculateValue(sel, ctx, astate.states[i], null, null);
}
public int length(Select sel, ExpContext ctx, ExpState state) {
return 0;
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
ArgsExpState astate = (ArgsExpState) state;
for (int i = 0; i < _args.length; i++) {
_args[i].appendTo(sel, ctx, astate.states[i], sql, index);
if (i < _args.length-1)
sql.append(", ");
}
}
public void appendIsEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
}
public void appendIsNotEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql){
}
public void appendSize(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
}
public void appendIsNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
}
public void appendIsNotNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
for (int i = 0; i < _args.length; i++)
_args[i].acceptVisit(visitor);
visitor.exit(this);
}
public int getId() {
return Val.ARGS_VAL;
}
}