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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */
package org.jooq.impl;

import static org.jooq.Clause.FIELD;
import static org.jooq.Clause.FIELD_VALUE;
import static org.jooq.conf.ParamType.INLINED;
import static org.jooq.conf.ParamType.NAMED_OR_INLINED;

import org.jooq.Clause;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.Param;
import org.jooq.tools.StringUtils;

/**
 * A base implementation for {@link Param}
 *
 * @author Lukas Eder
 */
abstract class AbstractParam extends AbstractField implements Param {

    /**
     * Generated UID
     */
    private static final long     serialVersionUID = 1311856649676227970L;
    private static final Clause[] CLAUSES          = { FIELD, FIELD_VALUE };

    private final String      paramName;
    T                         value;
    private boolean           inline;

    AbstractParam(T value, DataType type) {
        this(value, type, null);
    }

    AbstractParam(T value, DataType type, String paramName) {
        super(name(value, paramName), type);

        this.paramName = paramName;
        this.value = value;
    }

    /**
     * A utility method that generates a field name.
     * 
     * 

     * If paramName != null, take paramName
     * Otherwise, take the string value of value
     * 
     */
    private static String name(Object value, String paramName) {
        return paramName == null ? String.valueOf(value) : paramName;
    }

    // ------------------------------------------------------------------------
    // XXX: QueryPart API
    // ------------------------------------------------------------------------

    @Override
    public final Clause[] clauses(Context ctx) {
        return CLAUSES;
    }

    // ------------------------------------------------------------------------
    // XXX: Param API
    // ------------------------------------------------------------------------

    @Override
    public final void setValue(T value) {
        setConverted(value);
    }

    @Override
    public final void setConverted(Object value) {
        this.value = getDataType().convert(value);
    }

    @Override
    public final T getValue() {
        return value;
    }

    @Override
    public final String getParamName() {
        return paramName;
    }

    @Override
    public final void setInline(boolean inline) {
        this.inline = inline;
    }

    @Override
    public final boolean isInline() {
        return inline;
    }

    final boolean isInline(Context context) {
        return isInline()
            || (context.paramType() == INLINED)
            || (context.paramType() == NAMED_OR_INLINED && StringUtils.isBlank(paramName));
    }
}