Application: gvSIG desktop

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package org.gvsig.expressionevaluator.spi;

import java.util.ArrayList;

import java.util.List;

import java.util.Stack;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.PrettyFormatter;

/**

 *

 * @author jjdelcerro

 */

public class PrettyFormaterImpl implements PrettyFormatter {

    private class PrettyFormaterConfig {

        int indentSize;

        int indentation;

        boolean useNl;

        StringBuilder builder;

        public PrettyFormaterConfig() {

            this.indentSize = 4;

            this.indentation = 0;

            this.useNl = false;

            this.builder = null;

        }

        public PrettyFormaterConfig(int indentation, boolean useNl) {

            this.indentation = indentation;

            this.useNl = useNl;

            this.builder = null;

        }

        public StringBuilder builder() {

            if( this.builder == null ) {

                this.builder = new StringBuilder();

            }

            return this.builder;

        }

    }

    private Stack<PrettyFormaterConfig> config;

    public PrettyFormaterImpl() {

        this.config = new Stack<>();

        this.config.push(new PrettyFormaterConfig());

    }

    @Override

    public void setIndentSize(int indentSize) {

        PrettyFormaterConfig c = this.config.peek();

        c.indentSize = indentSize;

    }

    @Override

    public void setUseNl(boolean useNl) {

        PrettyFormaterConfig c = this.config.peek();

        c.useNl = useNl;

    }

    @Override

    public void indent() {

        PrettyFormaterConfig c = this.config.peek();

        c.indentation += 4;

    }

    @Override

    public void unindent() {

        PrettyFormaterConfig c = this.config.peek();

        c.indentation -= 4;

        if( c.indentation<0 ) {

            c.indentation = 0;

        }

    }

    @Override

    public void nl() {

        PrettyFormaterConfig c = this.config.peek();

        if( c.useNl ) {

            c.builder().append("\n");

            c.builder().append(StringUtils.repeat(' ', c.indentation));

        }

    }

    @Override

    public void push() {

        PrettyFormaterConfig c = this.config.peek();

        this.config.push(new PrettyFormaterConfig(c.indentation,c.useNl));

    }

    @Override

    public void pop() {

        PrettyFormaterConfig c = this.config.pop();

        if( this.config.isEmpty() ) {

            this.config.push(new PrettyFormaterConfig());

        }                

    }

    @Override

    public void append(Object o) {

        PrettyFormaterConfig c = this.config.peek();

        c.builder().append(o);

    }

    @Override

    public String build() {

        PrettyFormaterConfig c = this.config.peek();

        if( c.builder==null ) {

            return "";

        }

        return c.builder.toString();

    }

}