com.google.gwt.dev.cfg.ConfigurationProperty.java Source code

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Here is the source code for com.google.gwt.dev.cfg.ConfigurationProperty.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * 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.
 */
package com.google.gwt.dev.cfg;

import java.util.ArrayList;
import java.util.List;

/**
 * Represents a module property which does not impact deferred-binding
 * decisions.
 */
public class ConfigurationProperty extends Property {
    private final boolean allowMultipleValues;
    private List<String> values = new ArrayList<String>();

    public ConfigurationProperty(String name) {
        this(name, false);
    }

    public ConfigurationProperty(String name, boolean allowMultipleValues) {
        super(name);
        this.allowMultipleValues = allowMultipleValues;
        if (!allowMultipleValues) {
            values.add(null); // single-valued properties default to null
        }
    }

    public void addValue(String value) {
        if (!allowMultipleValues) {
            throw new IllegalStateException("Attempt to add a value to a single-valued ConfigurationProperty");
        }
        values.add(value);
    }

    public boolean allowsMultipleValues() {
        return allowMultipleValues;
    }

    public void clear() {
        values.clear();
    }

    public String getValue() {
        if (values.size() != 1) {
            throw new IllegalStateException("size != 1");
        }
        return values.get(0);
    }

    public List<String> getValues() {
        ArrayList<String> v = new ArrayList<String>(values.size());
        v.addAll(values);
        return v;
    }

    public boolean isMultiValued() {
        return values.size() > 1;
    }

    public void setValue(String value) {
        if (values.size() == 0) {
            values.add(value);
        } else {
            values.set(0, value);
        }
    }

    public void setValues(List<String> values) {
        if (!allowMultipleValues && values.size() > 1) {
            throw new IllegalStateException("Attempt to set > 1 value for a single-valued ConfigurationProperty");
        }
        this.values.clear();
        this.values.addAll(values);
    }
}