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Multi-dimensional Rule Engine
There is a newer version: 5.6.9
package com.cedarsoftware.ncube

import com.cedarsoftware.util.CompactCILinkedMap
import groovy.transform.CompileStatic

import static com.cedarsoftware.util.StringUtilities.hasContent

/**
 * This class represents a binding to a Set of columns, and the associated
 * return value.  It also knows at what depth it occurred in the execution
 * stack.
 *
 * @author John DeRegnaucourt ([email protected])
 *         

 *         Copyright (c) Cedar Software LLC
 *         


 *         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.
 */
@CompileStatic
class Binding
{
    private final String cubeName
    private final int depth
    private final Map coord = new CompactCILinkedMap<>()
    private final Set idCoord = new LinkedHashSet<>()
    private Object value
    private static final String newLine = "\n"

    Binding(String cubeName, int stackDepth)
    {
        this.cubeName = cubeName
        this.depth = stackDepth
    }

    String getCubeName()
    {
        return cubeName
    }

    void bind(String axisName, Column column)
    {
        coord.put(axisName, column)
        idCoord.add(column.id)
    }

    Object getValue()
    {
        return value
    }

    int getDepth()
    {
        return depth
    }

    void setValue(Object value)
    {
        this.value = value
    }

    int getNumBoundAxes()
    {
        return idCoord.size()
    }

    Set getIdCoordinate()
    {
        return idCoord
    }

    Map getCoordinate()
    {
        return coord
    }

    String toString()
    {
        return toHtml(false)
    }

    String toHtml()
    {
        return toHtml(true)
    }

    String toHtml(boolean tagsOK)
    {
        String spaces = padString('    ', depth)
        StringBuilder s = new StringBuilder(spaces)
        s.append(cubeName)
        s.append(newLine)
        for (Map.Entry entry : coord.entrySet())
        {
            Column column = entry.value
            s.append(spaces)
            s.append('  ')
            s.append(entry.key)
            s.append(': ')
            String name = (String) column.getMetaProperty('name')
            if (hasContent(name))
            {
                s.append(name)
                s.append(' / ')
            }
            s.append(column.value)
            s.append(newLine)
        }

        s.append(spaces)
        if (tagsOK)
        {
            s.append('  value = ')
        }
        else
        {
            s.append('  value = ')
        }
        s.append(value == null ? 'null' : value.toString())
        if (tagsOK)
        {
            s.append('')
        }
        return s.toString()
    }

    static String padString(String string, int length)
    {
        StringBuilder s = new StringBuilder()
        for (int i=0; i < length; i++)
        {
            s.append(string)
        }
        return s.toString()
    }
}