GroupManager/src/main/java/org/anjocaido/groupmanager/data/Variables.java

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package org.anjocaido.groupmanager.data;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * A class that holds variables of a user/group.
 * In groups, it holds the contents of INFO node.
 * Like:
 * prefix
 * suffix
 * build
 *
 * @author gabrielcouto
 */
public abstract class Variables implements Cloneable {
    private final DataUnit owner;
    protected final Map<String, Object> variables = Collections.synchronizedMap(new HashMap<String, Object>());

    public Variables(final DataUnit owner) {
        this.owner = owner;
    }

    public static Object parseVariableValue(final String value) {
        try {
            final Integer i = Integer.parseInt(value);
            return i;
        } catch (final NumberFormatException e) {
        }
        try {
            final Double d = Double.parseDouble(value);
            return d;
        } catch (final NumberFormatException e) {
        }
        if (value.equalsIgnoreCase("true") || value.equalsIgnoreCase("yes") || value.equalsIgnoreCase("on")) {
            return true;
        } else if (value.equalsIgnoreCase("false") || value.equalsIgnoreCase("no") || value.equalsIgnoreCase("off")) {
            return false;
        }
        return value;
    }

    /**
     * Add var to the the INFO node.
     * examples:
     * addVar("build",true);
     * addVar("prefix","c");
     *
     * @param name
     *            key name of the var
     * @param o
     *            the object value of the var
     */
    public void addVar(final String name, final Object o) {
        if (o == null) {
            return;
        }
        if (variables.containsKey(name)) {
            variables.remove(name);
        }
        variables.put(name, o);
        owner.flagAsChanged();
    }

    public void clearVars() {
        variables.clear();
        owner.flagAsChanged();
    }

    /**
     * @return the owner
     */
    public DataUnit getOwner() {
        return owner;
    }

    /**
     * Returns the quantity of vars this is holding
     *
     * @return the number of vars
     */
    public int getSize() {
        return variables.size();
    }

    /**
     *
     * @param name
     * @return false if null. or a Boolean.parseBoolean of the string
     */
    public Boolean getVarBoolean(final String name) {
        final Object o = variables.get(name);
        try {
            return o == null ? false : Boolean.parseBoolean(o.toString());
        } catch (final Exception e) {
            return false;
        }
    }

    /**
     *
     * @param name
     * @return -1 if null. or a parseDouble of the string
     */
    public Double getVarDouble(final String name) {
        final Object o = variables.get(name);
        try {
            return o == null ? -1.0D : Double.parseDouble(o.toString());
        } catch (final Exception e) {
            return -1.0D;
        }
    }

    /**
     *
     * @param name
     * @return -1 if null. or a parseInt of the string
     */
    public Integer getVarInteger(final String name) {
        final Object o = variables.get(name);
        try {
            return o == null ? -1 : Integer.parseInt(o.toString());
        } catch (final Exception e) {
            return -1;
        }
    }

    /**
     * All variable keys this is holding
     *
     * @return Set of all variable names.
     */
    public String[] getVarKeyList() {
        synchronized (variables) {
            return variables.keySet().toArray(new String[0]);
        }
    }

    /**
     * Returns the object inside the var
     *
     * @param name
     * @return a Object if exists. null if doesn't exists
     */
    public Object getVarObject(final String name) {
        return variables.get(name);
    }

    /**
     * Get the String value for the given var name
     *
     * @param name
     *            the var key name
     * @return "" if null. or the toString() value of object
     */
    public String getVarString(final String name) {
        final Object o = variables.get(name);
        try {
            return o == null ? "" : o.toString();
        } catch (final Exception e) {
            return "";
        }
    }

    /**
     * verify is a var exists
     *
     * @param name
     *            the key name of the var
     * @return true if that var exists
     */
    public boolean hasVar(final String name) {
        return variables.containsKey(name);
    }

    public boolean isEmpty() {
        return variables.isEmpty();
    }

    /**
     * Remove a var from the list
     *
     * @param name
     */
    public void removeVar(final String name) {
        try {
            variables.remove(name);
        } catch (final Exception e) {
        }
        owner.flagAsChanged();
    }
}